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Costa PJ, Martins FF, Pi C, Cui X, Calhorda MJ. C-H functionalization of quinoline N-oxides catalyzed by Pd(II) complexes: a computational study. Phys Chem Chem Phys 2023; 25:22755-22767. [PMID: 37605868 DOI: 10.1039/d3cp02445h] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 08/23/2023]
Abstract
Pd(II) catalysts, particularly the acetate salt in acetic acid, tended to favor regioselective C-H activation of quinoline N-oxides (QOs) at the C2 position. However, Pd(II)Cl2 was shown to catalyze their C-H activation at C8 and, in the presence of water, C8-H activation was accompanied by the formation of 2-quinolinones. The aim of the DFT study described in this work was to shed light on the complete mechanism of these competing catalytic reactions, when PdCl2 reacts with QO and benzaldehyde in dichloroethane. C-H activation of QO was the first step of the reaction and involved either a metallacycle, with a CQO-Pd(II) σ-bond and a C(8)-H-Pd(II) agostic bond, or an η3-QO complex, with three carbon atoms of the heteroring of QO binding PdCl2. The first situation led to the unusual C8 activation and the second to C2 activation. The σ-metallacycle undergoes C8-H activation and the energy of the TOF determining the transition state to form the product is ∼17 kcal mol-1, while for the reaction through the π-metallacycle (C2-H activation) the corresponding energy is higher (∼29 kcal mol-1) and thus is not competitive under the same conditions. The reaction proceeding through the σ-complex, activating the C8 position, is preferred, in agreement with experimental results. Both reactions involve oxidation of Pd(II) to Pd(IV) and the catalyst is regenerated. When small amounts of water are added to the reaction mixture, C8-H activation (acylation) results from the same σ-metallacycle with the same barrier, but the simultaneous formation of 2-quinolinones is more complicated. It starts with OH- attack at the C2 position, and is followed by the migration of two hydrogen atoms, and the final reductive elimination step ends with Pd(0). The higher barriers for the migration and reoxidation of Pd(0) are associated with the more demanding reaction conditions. The different reactivity of Pd(II)(OAc)2 under analogous conditions is clarified, as it is only capable of forming the above mentioned π-complex and thus of activating the C2 position of QO. This catalyst can preferentially activate the C8-H bond under rather different conditions, including in particular acetic acid medium, as shown by other authors.
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Affiliation(s)
- Paulo J Costa
- BioISI - Instituto de Biossistemas e Ciências Integrativas, Departamento de Química e Bioquímica, Faculdade de Ciências, Universidade de Lisboa, Campo Grande, 1749-016 Lisboa, Portugal.
| | - Frederico F Martins
- BioISI - Instituto de Biossistemas e Ciências Integrativas, Departamento de Química e Bioquímica, Faculdade de Ciências, Universidade de Lisboa, Campo Grande, 1749-016 Lisboa, Portugal.
| | - Chao Pi
- College of Chemistry, Henan Key Laboratory of Chemical Biology and Organic Chemistry, Key Laboratory of Applied Chemistry of Henan Universities, Zhengzhou University, Zhengzhou 450052, People's Republic of China
| | - Xiuling Cui
- College of Chemistry, Henan Key Laboratory of Chemical Biology and Organic Chemistry, Key Laboratory of Applied Chemistry of Henan Universities, Zhengzhou University, Zhengzhou 450052, People's Republic of China
| | - Maria José Calhorda
- BioISI - Instituto de Biossistemas e Ciências Integrativas, Departamento de Química e Bioquímica, Faculdade de Ciências, Universidade de Lisboa, Campo Grande, 1749-016 Lisboa, Portugal.
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Fialho CB, Cruz TFC, Rodrigues AI, Calhorda MJ, Vieira Ferreira LF, Pander P, Dias FB, Morgado J, Maçanita AL, Gomes PT. 9-Borafluoren-9-yl and diphenylboron tetracoordinate complexes of F- and Cl-substituted 8-quinolinolato ligands: synthesis, molecular and electronic structures, fluorescence and application in OLED devices. Dalton Trans 2023; 52:4933-4953. [PMID: 36951046 DOI: 10.1039/d3dt00496a] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 03/12/2023]
Abstract
Six new four-coordinate tetrahedral boron complexes, containing 9-borafluoren-9-yl and diphenylboron cores attached to orthogonal fluorine- and chlorine-substituted 8-quinolinolato ligand chromophores, have been synthesised, characterised, and applied as emitters in organic light-emitting diodes (OLEDs). An extensive steady-state and time-resolved photophysical study, in solution and in the solid state, resulted in the first-time report of delayed fluorescence (DF) in solid films of 8-quinolinolato boron complexes. The DF intensity dependence on excitation dose suggests that this emission originates from triplet-triplet annihilation (TTA). Density functional theory (DFT) and time-dependent density functional theory (TDDFT) studies give insight into the ground and excited state geometries, electronic structures, absorption energies, and singlet-triplet gaps in these new organoboron luminophores. Finally, given their highly luminescent behaviour, organic light-emitting diode (OLED) devices were produced using the synthesised organoboron compounds as emissive fluorescent dopants. The best OLED displays green-blue (λmaxEL = 489 nm) electroluminescence with an external quantum efficiency (EQE) of 3.3% and a maximum luminance of 6300 cd m-2.
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Affiliation(s)
- Carina B Fialho
- Centro de Química Estrutural, Departamento de Engenharia Química, Instituto Superior Técnico, Universidade de Lisboa, Av. Rovisco Pais, 1049-001 Lisboa, Portugal.
| | - Tiago F C Cruz
- Centro de Química Estrutural, Departamento de Engenharia Química, Instituto Superior Técnico, Universidade de Lisboa, Av. Rovisco Pais, 1049-001 Lisboa, Portugal.
| | - Ana I Rodrigues
- Centro de Química Estrutural, Departamento de Engenharia Química, Instituto Superior Técnico, Universidade de Lisboa, Av. Rovisco Pais, 1049-001 Lisboa, Portugal.
| | - Maria José Calhorda
- BioISI - Instituto de Biossistemas e Ciências Integrativas, Departamento de Química e Bioquímica, Faculdade de Ciências, Universidade de Lisboa, Campo Grande, 1749-016 Lisboa, Portugal
| | - Luís F Vieira Ferreira
- BSIRG - Biospectroscopy and Interfaces Research Group, IBB-Institute for Bioengineering and Biosciences, Instituto SuperiorTécnico, Universidade de Lisboa, 1049-001 Lisboa, Portugal
| | - Piotr Pander
- Faculty of Chemistry, Silesian University of Technology, Strzody 9, 44-100 Gliwice, Poland
- Centre for Organic and Nanohybrid Electronics, Silesian University of Technology, Konarskiego 22B, 44-100 Gliwice, Poland
- Department of Physics, Durham University, South Road, Durham, DH1 3LE, UK
| | - Fernando B Dias
- Department of Physics, Durham University, South Road, Durham, DH1 3LE, UK
| | - Jorge Morgado
- Instituto de Telecomunicações, Av. Rovisco Pais, 1049-001 Lisboa, Portugal
- Department of Bioengineering, Instituto Superior Técnico, Universidade de Lisboa, Av. Rovisco Pais, 1049-001 Lisboa, Portugal
| | - António L Maçanita
- Centro de Química Estrutural, Departamento de Engenharia Química, Instituto Superior Técnico, Universidade de Lisboa, Av. Rovisco Pais, 1049-001 Lisboa, Portugal.
| | - Pedro T Gomes
- Centro de Química Estrutural, Departamento de Engenharia Química, Instituto Superior Técnico, Universidade de Lisboa, Av. Rovisco Pais, 1049-001 Lisboa, Portugal.
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Vilas-Boas C, Neves AR, Carvalhal F, Pereira S, Calhorda MJ, Vasconcelos V, Pinto M, Sousa E, Almeida JR, Silva ER, Correia-da-Silva M. Multidimensional characterization of a new antifouling xanthone: Structure-activity relationship, environmental compatibility, and immobilization in marine coatings. Ecotoxicol Environ Saf 2021; 228:112970. [PMID: 34775347 DOI: 10.1016/j.ecoenv.2021.112970] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/08/2021] [Revised: 11/01/2021] [Accepted: 11/02/2021] [Indexed: 06/13/2023]
Abstract
The accumulation of marine biofouling on ship hulls causes material damage, the spread of invasive species, and, indirectly, an increase in full consumption and subsequent pollutant gas emissions. Most efficient antifouling (AF) strategies rely on the conventional release of persistent, bioaccumulative, and toxic biocides incorporated in marine coatings. A simple oxygenated xanthone, 3,4-dihydroxyxanthone (1), was previously reported as a promising AF agent toward the settlement of Mytilus galloprovincialis larvae, with a therapeutic ratio higher than the commercial biocide Econea®. In this work, a structure-AF activity relationship study, an evaluation of environmental fate, and an AF efficiency in marine coatings were performed with compound 1. Hydroxy or methoxy groups at 3 and 4 positions in compound 1 favored AF activity, and groups with higher steric hindrances were detrimental. Compound 1 demonstrated low water-solubility and a short half-life in natural seawater, contrary to Econea®. In silico environmental fate predictions showed that compound 1 does not bioaccumulate in organism tissues, in contrast to other current emerging biocides, has a moderate affinity for sediments and slow migrates to ground water. No toxicity was observed against Vibrio fischeri and Phaeodactylum tricornutum. Polyurethane-based marine coatings containing compound 1 prepared through an innovative non-release-strategy were as efficient as those containing Econea® with low releases to water after 45 days. This proof-of-concept helped to establish compound 1 as a promising eco-friendly AF agent.
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Affiliation(s)
- Cátia Vilas-Boas
- Laboratório de Química Orgânica e Farmacêutica, Departamento de Ciências Químicas, Faculdade de Farmácia, Universidade do Porto, Rua Jorge Viterbo Ferreira, 228, 4050-313 Porto, Portugal; CIIMAR-Interdisciplinary Centre of Marine and Environmental Research, Universidade do Porto, Avenida General Norton de Matos, 4450-208 Matosinhos, Portugal
| | - Ana Rita Neves
- Laboratório de Química Orgânica e Farmacêutica, Departamento de Ciências Químicas, Faculdade de Farmácia, Universidade do Porto, Rua Jorge Viterbo Ferreira, 228, 4050-313 Porto, Portugal; CIIMAR-Interdisciplinary Centre of Marine and Environmental Research, Universidade do Porto, Avenida General Norton de Matos, 4450-208 Matosinhos, Portugal
| | - Francisca Carvalhal
- Laboratório de Química Orgânica e Farmacêutica, Departamento de Ciências Químicas, Faculdade de Farmácia, Universidade do Porto, Rua Jorge Viterbo Ferreira, 228, 4050-313 Porto, Portugal; CIIMAR-Interdisciplinary Centre of Marine and Environmental Research, Universidade do Porto, Avenida General Norton de Matos, 4450-208 Matosinhos, Portugal
| | - Sandra Pereira
- CIIMAR-Interdisciplinary Centre of Marine and Environmental Research, Universidade do Porto, Avenida General Norton de Matos, 4450-208 Matosinhos, Portugal
| | - Maria José Calhorda
- BioISI - Biosystems & Integrative Sciences Institute, Faculdade de Ciências, Universidade de Lisboa, Campo Grande, 1749-016 Lisboa, Portugal
| | - Vitor Vasconcelos
- CIIMAR-Interdisciplinary Centre of Marine and Environmental Research, Universidade do Porto, Avenida General Norton de Matos, 4450-208 Matosinhos, Portugal; Departamento de Biologia, Faculdade de Ciências, Universidade do Porto, Rua do Campo Alegre, P 4069-007 Porto, Portugal
| | - Madalena Pinto
- Laboratório de Química Orgânica e Farmacêutica, Departamento de Ciências Químicas, Faculdade de Farmácia, Universidade do Porto, Rua Jorge Viterbo Ferreira, 228, 4050-313 Porto, Portugal; CIIMAR-Interdisciplinary Centre of Marine and Environmental Research, Universidade do Porto, Avenida General Norton de Matos, 4450-208 Matosinhos, Portugal
| | - Emília Sousa
- Laboratório de Química Orgânica e Farmacêutica, Departamento de Ciências Químicas, Faculdade de Farmácia, Universidade do Porto, Rua Jorge Viterbo Ferreira, 228, 4050-313 Porto, Portugal; CIIMAR-Interdisciplinary Centre of Marine and Environmental Research, Universidade do Porto, Avenida General Norton de Matos, 4450-208 Matosinhos, Portugal
| | - Joana R Almeida
- CIIMAR-Interdisciplinary Centre of Marine and Environmental Research, Universidade do Porto, Avenida General Norton de Matos, 4450-208 Matosinhos, Portugal
| | - Elisabete R Silva
- BioISI - Biosystems & Integrative Sciences Institute, Faculdade de Ciências, Universidade de Lisboa, Campo Grande, 1749-016 Lisboa, Portugal; CERENA - Centro de Recursos Naturais e Ambiente, Instituto Superior Técnico, Universidade de Lisboa, Av. Rovisco Pais 1, 1049-001 Lisboa, Portugal.
| | - Marta Correia-da-Silva
- Laboratório de Química Orgânica e Farmacêutica, Departamento de Ciências Químicas, Faculdade de Farmácia, Universidade do Porto, Rua Jorge Viterbo Ferreira, 228, 4050-313 Porto, Portugal; CIIMAR-Interdisciplinary Centre of Marine and Environmental Research, Universidade do Porto, Avenida General Norton de Matos, 4450-208 Matosinhos, Portugal.
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Sánchez-González Á, Bandeira NAG, Ortiz de Luzuriaga I, Martins FF, Elleuchi S, Jarraya K, Lanuza J, Lopez X, Calhorda MJ, Gil A. New Insights on the Interaction of Phenanthroline Based Ligands and Metal Complexes and Polyoxometalates with Duplex DNA and G-Quadruplexes. Molecules 2021; 26:4737. [PMID: 34443326 PMCID: PMC8397986 DOI: 10.3390/molecules26164737] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/30/2021] [Revised: 07/28/2021] [Accepted: 07/29/2021] [Indexed: 12/24/2022] Open
Abstract
This work provides new insights from our team regarding advances in targeting canonical and non-canonical nucleic acid structures. This modality of medical treatment is used as a form of molecular medicine specifically against the growth of cancer cells. Nevertheless, because of increasing concerns about bacterial antibiotic resistance, this medical strategy is also being explored in this field. Up to three strategies for the use of DNA as target have been studied in our research lines during the last few years: (1) the intercalation of phenanthroline derivatives with duplex DNA; (2) the interaction of metal complexes containing phenanthroline with G-quadruplexes; and (3) the activity of Mo polyoxometalates and other Mo-oxo species as artificial phosphoesterases to catalyze the hydrolysis of phosphoester bonds in DNA. We demonstrate some promising computational results concerning the favorable interaction of these small molecules with DNA that could correspond to cytotoxic effects against tumoral cells and microorganisms. Therefore, our results open the door for the pharmaceutical and medical applications of the compounds we propose.
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Affiliation(s)
- Ángel Sánchez-González
- Faculdade de Ciências, BioISI-Biosystems and Integrative Sciences Institute, Universidade de Lisboa, Campo Grande, 1749-016 Lisboa, Portugal; (Á.S.-G.); (N.A.G.B.); (F.F.M.); (M.J.C.)
| | - Nuno A. G. Bandeira
- Faculdade de Ciências, BioISI-Biosystems and Integrative Sciences Institute, Universidade de Lisboa, Campo Grande, 1749-016 Lisboa, Portugal; (Á.S.-G.); (N.A.G.B.); (F.F.M.); (M.J.C.)
| | - Iker Ortiz de Luzuriaga
- CIC nanoGUNE BRTA, Tolosa Hiribidea 76, Euskadi, 20018 Donostia-San Sebastián, Spain;
- Polimero eta Material Aurreratuak, Fisika, Kimika eta Teknologia Saila, Kimika Fakultatea, Euskal Herriko Unibertsitatea (UPV/EHU), Paseo Manuel de Lardizabal 3, 20018 Donostia-San Sebastián, Spain; (J.L.); (X.L.)
| | - Frederico F. Martins
- Faculdade de Ciências, BioISI-Biosystems and Integrative Sciences Institute, Universidade de Lisboa, Campo Grande, 1749-016 Lisboa, Portugal; (Á.S.-G.); (N.A.G.B.); (F.F.M.); (M.J.C.)
| | - Sawssen Elleuchi
- Laboratoire de Chimie Inorganique, LR17ES07, Faculté de Sciences de Sfax, Université de Sfax, Sfax 3000, Tunisia; (S.E.); (K.J.)
| | - Khaled Jarraya
- Laboratoire de Chimie Inorganique, LR17ES07, Faculté de Sciences de Sfax, Université de Sfax, Sfax 3000, Tunisia; (S.E.); (K.J.)
| | - Jose Lanuza
- Polimero eta Material Aurreratuak, Fisika, Kimika eta Teknologia Saila, Kimika Fakultatea, Euskal Herriko Unibertsitatea (UPV/EHU), Paseo Manuel de Lardizabal 3, 20018 Donostia-San Sebastián, Spain; (J.L.); (X.L.)
- Donostia International Physics Center (DIPC), Paseo Manuel de Lardizabal 4, 20018 Donostia-San Sebastián, Spain
| | - Xabier Lopez
- Polimero eta Material Aurreratuak, Fisika, Kimika eta Teknologia Saila, Kimika Fakultatea, Euskal Herriko Unibertsitatea (UPV/EHU), Paseo Manuel de Lardizabal 3, 20018 Donostia-San Sebastián, Spain; (J.L.); (X.L.)
- Donostia International Physics Center (DIPC), Paseo Manuel de Lardizabal 4, 20018 Donostia-San Sebastián, Spain
| | - Maria José Calhorda
- Faculdade de Ciências, BioISI-Biosystems and Integrative Sciences Institute, Universidade de Lisboa, Campo Grande, 1749-016 Lisboa, Portugal; (Á.S.-G.); (N.A.G.B.); (F.F.M.); (M.J.C.)
| | - Adrià Gil
- Faculdade de Ciências, BioISI-Biosystems and Integrative Sciences Institute, Universidade de Lisboa, Campo Grande, 1749-016 Lisboa, Portugal; (Á.S.-G.); (N.A.G.B.); (F.F.M.); (M.J.C.)
- CIC nanoGUNE BRTA, Tolosa Hiribidea 76, Euskadi, 20018 Donostia-San Sebastián, Spain;
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Glatz M, Gorgas N, Stöger B, Pittenauer E, Ferreira L, Veiros LF, Calhorda MJ, Kirchner K. Structural and Electronic Properties of Iron(0) PNP Pincer Complexes. Z Anorg Allg Chem 2021; 647:1429-1435. [PMID: 34413550 PMCID: PMC8360027 DOI: 10.1002/zaac.202100015] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/13/2021] [Revised: 02/16/2021] [Indexed: 11/06/2022]
Abstract
In the present work we have prepared and fully characterized several Fe(0) complexes of the type [Fe(PNP)(CO)2] treating Fe(II) complexes [Fe(PNP)(Cl)2] with KC8 in the presence of carbon monoxide. While complexes [Fe(PNPNMe-iPr)(CO)2], [Fe(PNPNEt-iPr)(CO)2] adopt a trigonal bipyramidal geometry, the bulkier and more electron rich [Fe(PNPNH-tBu)(CO)2] is closer to a square pyramidal geometry. Mössbauer spectra showed isomer shifts very close to 0 and similar to those reported for Fe(I) systems. Quadrupole splitting values range between 2.2 and 2.7 mm s-1 both in experiments and DFT calculations, while those of Fe(I) complexes are much smaller (∼0.6 mm s-1).
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Affiliation(s)
- Mathias Glatz
- Institute of Applied Synthetic ChemistryVienna University of TechnologyGetreidemarkt 9/163-AC1060ViennaAustria
| | - Nikolaus Gorgas
- Institute of Applied Synthetic ChemistryVienna University of TechnologyGetreidemarkt 9/163-AC1060ViennaAustria
| | - Berthold Stöger
- X-ray CenterVienna University of TechnologyGetreidemarkt 9/163-OC1060ViennaAustria
| | - Ernst Pittenauer
- Institute of Chemical Technologies and AnalyticsVienna University of TechnologyGetreidemarkt 9A-1060ViennaAustria
| | - Liliana Ferreira
- Department of PhysicsUniversity of Coimbra3004-516CoimbraPortugal
- BioISI-Biosystems and Integrative Sciences InstituteFaculdade de CiênciasUniversidade de Lisboa1749-016LisboaPortugal
| | - Luis F. Veiros
- Centro de Química Estrutural and Departamento de Engenharia QuímicaInstituto Superior TécnicoUniversidade de LisboaAv Rovisco Pais1049-001LisboaPortugal
| | - Maria José Calhorda
- BioISI-Biosystems and Integrative Sciences InstituteFaculdade de CiênciasUniversidade de Lisboa1749-016LisboaPortugal
| | - Karl Kirchner
- Institute of Applied Synthetic ChemistryVienna University of TechnologyGetreidemarkt 9/163-AC1060ViennaAustria
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Taylor J, Culpeck R, Chippindale AM, Calhorda MJ, Hartl F. Effect of the 2-R-Allyl and Chloride Ligands on the Cathodic Paths of [Mo(η 3-2-R-allyl)(α-diimine)(CO) 2Cl] (R = H, CH 3; α-diimine = 6,6'-Dimethyl-2,2'-bipyridine, Bis( p-tolylimino)acenaphthene). Organometallics 2021; 40:1598-1613. [PMID: 34295012 PMCID: PMC8289335 DOI: 10.1021/acs.organomet.1c00038] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/20/2021] [Indexed: 11/28/2022]
Abstract
The new, formally Mo(II) complexes [Mo(η3-2-R-allyl)(6,6'-dmbipy)(CO)2Cl] (6,6'-dmbipy = 6,6'-dimethyl-2,2'-bipyridine; 2-R-allyl = allyl for R = H, 2-methallyl for R = CH3) and [Mo(η3-2-methallyl)(pTol-bian)(CO)2Cl] (pTol-bian = bis(p-tolylimino)acenaphthene) share, in this rare case, the same structural type. The effect of the anionic π-donor ligand X (Cl- vs NCS-) and the 2-R-allyl substituents on the cathodic behavior was explored. Both ligands play a significant role at all stages of the reduction path. While 2e--reduced [Mo(η3-allyl)(6,6'-dmbipy)(CO)2]- is inert when it is ECE-generated from [Mo(η3-allyl)(6,6'-dmbipy)(CO)2(NCS)], the Cl- ligand promotes Mo-Mo dimerization by facilitating the nucleophilic attack of [Mo(η3-allyl)(6,6'-dmbipy)(CO)2]- at the parent complex at ambient temperature. The replacement of the allyl ligand by 2-methallyl has a similar effect. The Cl-/2-methallyl ligand assembly destabilizes even primary radical anions of the complex containing the strongly π-accepting pTol-Bian ligand. Under argon, the cathodic paths of [Mo(η3-2-R-allyl)(6,6'-dmbipy)(CO)2Cl] terminate at ambient temperature with 5-coordinate [Mo(6,6'-dmbipy)(CO)3]2- instead of [Mo(η3-2-R-allyl)(6,6'-dmbipy)(CO)2]-, which is stabilized in chilled electrolyte. [Mo(η3-allyl)(6,6'-dmbipy)(CO)2]- catalyzes CO2 reduction only when it is generated at the second cathodic wave of the parent complex, while [Mo(η3-2-methallyl)(6,6'-dmbipy)(CO)2]- is already moderately active at the first cathodic wave. This behavior is fully consistent with absent dimerization under argon on the cyclic voltammetric time scale. The electrocatalytic generation of CO and formate is hampered by the irreversible formation of anionic tricarbonyl complexes replacing reactive [Mo(η3-2-methallyl)(6,6'-dmbipy)(CO)2]2 along the cathodic route.
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Affiliation(s)
- James
O. Taylor
- Department
of Chemistry, University of Reading, Reading RG6 6DX, United Kingdom
| | - Ryan Culpeck
- Department
of Chemistry, University of Reading, Reading RG6 6DX, United Kingdom
| | - Ann M. Chippindale
- Department
of Chemistry, University of Reading, Reading RG6 6DX, United Kingdom
| | - Maria José Calhorda
- BioISI-Biosystems
& Integrative Sciences Institute, Departamento de Química
e Bioquímica, Faculdade de Ciências, Universidade de Lisboa, 1749-016 Lisbon, Portugal
| | - František Hartl
- Department
of Chemistry, University of Reading, Reading RG6 6DX, United Kingdom
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Vasconcellos-Dias M, Nunes CD, Félix V, Brandão P, Calhorda MJ. New heptacoordinate tungsten(II) complexes with α-diimine ligands in the catalytic oxidation of multifunctional olefins. Inorganica Chim Acta 2021. [DOI: 10.1016/j.ica.2021.120263] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/22/2022]
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Fernandes TA, Mendo SG, Ferreira LP, Neng NR, Oliveira MC, Gil A, Carvalho MD, Monteiro OC, Nogueira JMF, Calhorda MJ. Photocatalytic degradation of acetaminophen and caffeine using magnetite-hematite combined nanoparticles: kinetics and mechanisms. Environ Sci Pollut Res Int 2021; 28:17228-17243. [PMID: 33394452 DOI: 10.1007/s11356-020-12016-z] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/18/2020] [Accepted: 12/08/2020] [Indexed: 06/12/2023]
Abstract
The increased use of pharmaceutical and personal care products (PPCPs) has contributed to the contamination of water systems and put pressure on the development of new techniques to deal with this problem. Acetaminophen (paracetamol), a common analgesic and antipyretic drug, and caffeine, a known central nervous system stimulant, are being used frequently by many people and found in large amounts in wastewater systems. In this work, their removal, by photocatalytic degradation, was promoted using magnetic nanoparticles (NPs) based on iron oxides. Besides being obtained from cheap and plentiful source, the magnetic properties of these NPs provide an easy way to separate them from the solution when the reaction is complete. Three types of hematite-based NPs, one pure (1) and two of them composed by a magnetite core partially (2) or completely (3) covered by a hematite shell, were synthesized and characterized. Sample 2 was the best photocatalyst for both pollutants' photo-assisted degradation. Under UV-vis irradiation and using a 0.13 g catalyst/L solution, the total acetaminophen and caffeine degradation (20 ppm/150 mL) was achieved in 45 min and 60 min, respectively. The identification of some of the intermediate products was carried out by liquid chromatography in combination with electrospray ionization mass spectrometry. A complementary Density Functional Theory (DFT) study revealed the relative stability of several species formed during the acetaminophen and caffeine degradation processes and gave some insight about the most favorable degradation pathways.
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Affiliation(s)
- Tiago A Fernandes
- Centro de Química e Bioquímica, Departamento de Química e Bioquímica, Faculdade de Ciências, Universidade de Lisboa, 1749-016, Lisbon, Portugal
- Centro de Química Estrutural, Faculdade de Ciências, Universidade de Lisboa, 1749-016, Lisbon, Portugal
| | - Sofia G Mendo
- Centro de Química e Bioquímica, Departamento de Química e Bioquímica, Faculdade de Ciências, Universidade de Lisboa, 1749-016, Lisbon, Portugal
| | - Liliana P Ferreira
- Physics Department, University of Coimbra, 3004-516, Coimbra, Portugal
- BioISI - Biosystems and Integrative Sciences Institute, Faculdade de Ciências, Universidade de Lisboa, 1749-016, Lisbon, Portugal
| | - Nuno R Neng
- Centro de Química e Bioquímica, Departamento de Química e Bioquímica, Faculdade de Ciências, Universidade de Lisboa, 1749-016, Lisbon, Portugal
- Centro de Química Estrutural, Faculdade de Ciências, Universidade de Lisboa, 1749-016, Lisbon, Portugal
| | - M Conceição Oliveira
- Centro de Química Estrutural, Instituto Superior Técnico, Universidade de Lisboa, 1049-001, Lisbon, Portugal
| | - Adrià Gil
- Centro de Química e Bioquímica, Departamento de Química e Bioquímica, Faculdade de Ciências, Universidade de Lisboa, 1749-016, Lisbon, Portugal
- BioISI - Biosystems and Integrative Sciences Institute, Faculdade de Ciências, Universidade de Lisboa, 1749-016, Lisbon, Portugal
- CIC nanoGUNE BRTA, Tolosa Hiribidea 76, 20018, Donostia-San Sebastián, Euskadi, Spain
| | - Maria Deus Carvalho
- Centro de Química e Bioquímica, Departamento de Química e Bioquímica, Faculdade de Ciências, Universidade de Lisboa, 1749-016, Lisbon, Portugal
| | - Olinda C Monteiro
- Centro de Química e Bioquímica, Departamento de Química e Bioquímica, Faculdade de Ciências, Universidade de Lisboa, 1749-016, Lisbon, Portugal
- Centro de Química Estrutural, Faculdade de Ciências, Universidade de Lisboa, 1749-016, Lisbon, Portugal
| | - José M F Nogueira
- Centro de Química e Bioquímica, Departamento de Química e Bioquímica, Faculdade de Ciências, Universidade de Lisboa, 1749-016, Lisbon, Portugal
- Centro de Química Estrutural, Faculdade de Ciências, Universidade de Lisboa, 1749-016, Lisbon, Portugal
| | - Maria José Calhorda
- Centro de Química e Bioquímica, Departamento de Química e Bioquímica, Faculdade de Ciências, Universidade de Lisboa, 1749-016, Lisbon, Portugal.
- BioISI - Biosystems and Integrative Sciences Institute, Faculdade de Ciências, Universidade de Lisboa, 1749-016, Lisbon, Portugal.
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9
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Bandeira NAG, Liu H, Calhorda MJ. A lacunary tungstomolybdophosphate as an electronic pendulum: The "blue" electron under examination. J Chem Phys 2021; 154:124301. [PMID: 33810680 DOI: 10.1063/5.0039092] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Abstract
The photoreduction of a Keggin type lacunary tungstomolybdophosphate, α-(Bu4N)4[H3PW9Mo2O39], in acetonitrile, led to the formation of a monoreduced lacunary heteropoly anion, or a one electron reduced "heteropoly blue" species, whereby the added "blue" electron was captured by the molybdenum atoms. The magnetic properties and behavior of the "blue" electron were studied by a modified Evans nuclear magnetic resonance method (small downshift of the 31P signal) and variable-temperature electron paramagnetic resonance (g = 1.936 for MoV). The intermolecular exchange of the "blue" electron was limited by a geometrical factor, which requires the contact between Mo caps to exchange it between the heteropoly couple. The intramolecular exchange of the "blue" electron between Mo atoms was rather fast (5.3 × 109 s-1), with a rate of more than six orders of magnitude larger than the intermolecular exchange rate. Density functional theory was used to determine the most prevalent protonation sites in the mixed lacunary isomers with the aim of studying the intramolecular electron transfer pathway in the isolated [H4PW9Mo2O39]4- species. The singly occupied molecular orbital (SOMO) is essentially localized in one of the two nonequivalent molybdenum sites. The kinetics of the intramolecular electron exchange equilibrium MoV + MoVI → MoVI + MoV between the two molybdenum atoms bridged by an oxygen atom was found to be fast in agreement with the experimental result. The transition state is of mixed-valence type, with the SOMO delocalized over the Mo-O-Mo group. Spectroscopic parameters were found to be in fair agreement with experimental results.
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Affiliation(s)
- Nuno A G Bandeira
- BioISI - Biosystems and Integrative Sciences Institute, Departamento de Química e Bioquímica, Faculdade de Ciências, Universidade de Lisboa, Campo Grande, Ed. C8, 1749-016 Lisboa, Portugal
| | - Huizhang Liu
- BioISI - Biosystems and Integrative Sciences Institute, Departamento de Química e Bioquímica, Faculdade de Ciências, Universidade de Lisboa, Campo Grande, Ed. C8, 1749-016 Lisboa, Portugal
| | - Maria José Calhorda
- BioISI - Biosystems and Integrative Sciences Institute, Departamento de Química e Bioquímica, Faculdade de Ciências, Universidade de Lisboa, Campo Grande, Ed. C8, 1749-016 Lisboa, Portugal
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10
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da Silva FF, Cunha T, Rebelo A, Gil A, Calhorda MJ, García G, Ingólfsson O, Limão-Vieira P. Electron-Transfer-Induced Side-Chain Cleavage in Tryptophan Facilitated through Potassium-Induced Transition-State Stabilization in the Gas Phase. J Phys Chem A 2021; 125:2324-2333. [DOI: 10.1021/acs.jpca.1c00690] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Filipe Ferreira da Silva
- Atomic and Molecular Collisions Laboratory, CEFITEC, Department of Physics, Universidade NOVA de Lisboa, 2829-516 Caparica, Portugal
| | - Tiago Cunha
- Atomic and Molecular Collisions Laboratory, CEFITEC, Department of Physics, Universidade NOVA de Lisboa, 2829-516 Caparica, Portugal
| | - Andre Rebelo
- Atomic and Molecular Collisions Laboratory, CEFITEC, Department of Physics, Universidade NOVA de Lisboa, 2829-516 Caparica, Portugal
| | - Adrià Gil
- BioISI -Biosystems & Integrative Sciences Institute, Departamento de Química e Bioquímica, Faculdade de Ciências, Universidade de Lisboa, Campo Grande, 1749-016 Lisboa, Portugal
- CIC nanoGUNE BRTA, Tolosa Hiribidea, 76, E-20018 Donostia − San Sebastián, Euskadi, Spain
| | - Maria José Calhorda
- BioISI -Biosystems & Integrative Sciences Institute, Departamento de Química e Bioquímica, Faculdade de Ciências, Universidade de Lisboa, Campo Grande, 1749-016 Lisboa, Portugal
| | - Gustavo García
- Instituto de Física Fundamental, Consejo Superior de Investigaciones Científicas (CSIC), Serrano 113-bis, 28006 Madrid, Spain
| | - Oddur Ingólfsson
- Chemistry and Science Institute, University of Iceland, Dunhagi 3, 107 Reykjavik, Iceland
| | - Paulo Limão-Vieira
- Atomic and Molecular Collisions Laboratory, CEFITEC, Department of Physics, Universidade NOVA de Lisboa, 2829-516 Caparica, Portugal
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11
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Paramasivam K, Fialho CB, Cruz TFC, Rodrigues AI, Ferreira B, Gomes CSB, Vila-Viçosa D, Charas A, Esperança JMSS, Vieira Ferreira LF, Calhorda MJ, Maçanita AL, Morgado J, Gomes PT. New luminescent tetracoordinate boron complexes: an in-depth experimental and theoretical characterisation and their application in OLEDs. Inorg Chem Front 2021. [DOI: 10.1039/d1qi00403d] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/11/2023]
Abstract
New luminescent 2-iminopyrrolyl boron complexes with different BX2 moieties are extensively studied via complementary experimental and theoretical methodologies, including application in OLEDs.
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Affiliation(s)
- Krishnamoorthy Paramasivam
- Centro de Química Estrutural, Instituto Superior Técnico, Universidade de Lisboa, Av. Rovisco Pais, 1049-001 Lisboa, Portugal
- Centre for Environmental Research, Department of Chemistry, Kongu Engineering College, Perundurai, Erode 638 060, India
| | - Carina B. Fialho
- Centro de Química Estrutural, Instituto Superior Técnico, Universidade de Lisboa, Av. Rovisco Pais, 1049-001 Lisboa, Portugal
| | - Tiago F. C. Cruz
- Centro de Química Estrutural, Instituto Superior Técnico, Universidade de Lisboa, Av. Rovisco Pais, 1049-001 Lisboa, Portugal
| | - Ana I. Rodrigues
- Centro de Química Estrutural, Instituto Superior Técnico, Universidade de Lisboa, Av. Rovisco Pais, 1049-001 Lisboa, Portugal
| | - Bruno Ferreira
- Centro de Química Estrutural, Instituto Superior Técnico, Universidade de Lisboa, Av. Rovisco Pais, 1049-001 Lisboa, Portugal
| | - Clara S. B. Gomes
- Centro de Química Estrutural, Instituto Superior Técnico, Universidade de Lisboa, Av. Rovisco Pais, 1049-001 Lisboa, Portugal
- LAQV-REQUIMTE, Departamento de Química, Faculdade de Ciências e Tecnologia, Universidade NOVA de Lisboa, 2829-516 Caparica, Portugal
- UCIBIO-REQUIMTE, Departamento de Química, Faculdade de Ciências e Tecnologia, Universidade NOVA de Lisboa, 2829-516 Caparica, Portugal
| | - Diogo Vila-Viçosa
- BioISI - Biosystems & Integrative Sciences Institute, Departamento de Química e Bioquímica, Faculdade de Ciências, Universidade de Lisboa, Campo Grande, Ed. C8, 1749-016 Lisboa, Portugal
| | - Ana Charas
- Instituto de Telecomunicações, Av. Rovisco Pais, 1049-001 Lisboa, Portugal
| | - José M. S. S. Esperança
- LAQV-REQUIMTE, Departamento de Química, Faculdade de Ciências e Tecnologia, Universidade NOVA de Lisboa, 2829-516 Caparica, Portugal
| | - Luís F. Vieira Ferreira
- BSIRG – Biospectroscopy and Interfaces Research Group, IBB-Institute for Bioengineering and Biosciences, Instituto Superior Técnico, Universidade de Lisboa, 1049-001 Lisboa, Portugal
| | - Maria José Calhorda
- BioISI - Biosystems & Integrative Sciences Institute, Departamento de Química e Bioquímica, Faculdade de Ciências, Universidade de Lisboa, Campo Grande, Ed. C8, 1749-016 Lisboa, Portugal
| | - António L. Maçanita
- Centro de Química Estrutural, Instituto Superior Técnico, Universidade de Lisboa, Av. Rovisco Pais, 1049-001 Lisboa, Portugal
- Departamento de Engenharia Química, Instituto Superior Técnico, Universidade de Lisboa, Av. Rovisco Pais, 1049-001 Lisboa, Portugal
| | - Jorge Morgado
- Instituto de Telecomunicações, Av. Rovisco Pais, 1049-001 Lisboa, Portugal
- Department of Bioengineering, Instituto Superior Técnico, Universidade de Lisboa, Av. Rovisco Pais, 1049-001 Lisboa, Portugal
| | - Pedro T. Gomes
- Centro de Química Estrutural, Instituto Superior Técnico, Universidade de Lisboa, Av. Rovisco Pais, 1049-001 Lisboa, Portugal
- Departamento de Engenharia Química, Instituto Superior Técnico, Universidade de Lisboa, Av. Rovisco Pais, 1049-001 Lisboa, Portugal
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12
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Vilas-Boas C, Carvalhal F, Pereira B, Carvalho S, Sousa E, Pinto MMM, Calhorda MJ, Vasconcelos V, Almeida JR, Silva ER, Correia-da-Silva M. One Step Forward towards the Development of Eco-Friendly Antifouling Coatings: Immobilization of a Sulfated Marine-Inspired Compound. Mar Drugs 2020; 18:md18100489. [PMID: 32992876 PMCID: PMC7600153 DOI: 10.3390/md18100489] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/18/2020] [Revised: 09/19/2020] [Accepted: 09/23/2020] [Indexed: 12/30/2022] Open
Abstract
Marine biofouling represents a global economic and ecological challenge and few eco-friendly antifouling agents are available. The aim of this work was to establish the proof of concept that a recently synthesized nature-inspired compound (gallic acid persulfate, GAP) can act as an eco-friendly and effective antifoulant when immobilized in coatings through a non-release strategy, promoting a long-lasting antifouling effect. The synthesis of GAP was optimized to provide quantitative yields. GAP water solubility was assessed, showing values higher than 1000 mg/mL. GAP was found to be stable in sterilized natural seawater with a half-life (DT50) of 7 months. GAP was immobilized into several commercial coatings, exhibiting high compatibility with different polymeric matrices. Leaching assays of polydimethylsiloxane and polyurethane-based marine coatings containing GAP confirmed that the chemical immobilization of GAP was successful, since releases up to fivefold lower than the conventional releasing systems of polyurethane-based marine coatings were observed. Furthermore, coatings containing immobilized GAP exhibited the most auspicious anti-settlement effect against Mytilus galloprovincialis larvae for the maximum exposure period (40 h) in laboratory trials. Overall, GAP promises to be an agent capable of improving the antifouling activity of several commercial marine coatings with desirable environmental properties.
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Affiliation(s)
- Cátia Vilas-Boas
- Laboratório de Química Orgânica e Farmacêutica, Departamento de Ciências Químicas, Faculdade de Farmácia, Universidade do Porto, R. Jorge de Viterbo Ferreira 228, 4050-313 Porto, Portugal; (C.V.-B.); (F.C.); (E.S.); (M.M.M.P.)
- CIIMAR—Centro Interdisciplinar de Investigação Marinha e Ambiental, Avenida General Norton de Matos, S/N, 4450-208 Matosinhos, Portugal; (V.V.); (J.R.A.)
| | - Francisca Carvalhal
- Laboratório de Química Orgânica e Farmacêutica, Departamento de Ciências Químicas, Faculdade de Farmácia, Universidade do Porto, R. Jorge de Viterbo Ferreira 228, 4050-313 Porto, Portugal; (C.V.-B.); (F.C.); (E.S.); (M.M.M.P.)
- CIIMAR—Centro Interdisciplinar de Investigação Marinha e Ambiental, Avenida General Norton de Matos, S/N, 4450-208 Matosinhos, Portugal; (V.V.); (J.R.A.)
| | - Beatriz Pereira
- BioISI—Instituto de Biosistemas e Ciências Integrativas, Departamento de Química e Bioquímica, Faculdade de Ciências, Universidade de Lisboa, Campo Grande, Lisboa, 1749-016 Portugal; (B.P.); (M.J.C.)
| | - Sílvia Carvalho
- CQB—Centro de Química e Bioquímica, Departamento de Química e Bioquímica, Faculdade de Ciências, Universidade de Lisboa, Campo Grande, Lisboa, 1749-016 Lisboa, Portugal;
| | - Emília Sousa
- Laboratório de Química Orgânica e Farmacêutica, Departamento de Ciências Químicas, Faculdade de Farmácia, Universidade do Porto, R. Jorge de Viterbo Ferreira 228, 4050-313 Porto, Portugal; (C.V.-B.); (F.C.); (E.S.); (M.M.M.P.)
- CIIMAR—Centro Interdisciplinar de Investigação Marinha e Ambiental, Avenida General Norton de Matos, S/N, 4450-208 Matosinhos, Portugal; (V.V.); (J.R.A.)
| | - Madalena M. M. Pinto
- Laboratório de Química Orgânica e Farmacêutica, Departamento de Ciências Químicas, Faculdade de Farmácia, Universidade do Porto, R. Jorge de Viterbo Ferreira 228, 4050-313 Porto, Portugal; (C.V.-B.); (F.C.); (E.S.); (M.M.M.P.)
- CIIMAR—Centro Interdisciplinar de Investigação Marinha e Ambiental, Avenida General Norton de Matos, S/N, 4450-208 Matosinhos, Portugal; (V.V.); (J.R.A.)
| | - Maria José Calhorda
- BioISI—Instituto de Biosistemas e Ciências Integrativas, Departamento de Química e Bioquímica, Faculdade de Ciências, Universidade de Lisboa, Campo Grande, Lisboa, 1749-016 Portugal; (B.P.); (M.J.C.)
| | - Vitor Vasconcelos
- CIIMAR—Centro Interdisciplinar de Investigação Marinha e Ambiental, Avenida General Norton de Matos, S/N, 4450-208 Matosinhos, Portugal; (V.V.); (J.R.A.)
- Departamento de Biologia, Faculdade de Ciências, Universidade do Porto, Rua do Campo Alegre S/N, 4169-007 Porto, Portugal
| | - Joana R. Almeida
- CIIMAR—Centro Interdisciplinar de Investigação Marinha e Ambiental, Avenida General Norton de Matos, S/N, 4450-208 Matosinhos, Portugal; (V.V.); (J.R.A.)
| | - Elisabete R. Silva
- BioISI—Instituto de Biosistemas e Ciências Integrativas, Departamento de Química e Bioquímica, Faculdade de Ciências, Universidade de Lisboa, Campo Grande, Lisboa, 1749-016 Portugal; (B.P.); (M.J.C.)
- Correspondence: (E.R.S.); (M.C.-d.-S.)
| | - Marta Correia-da-Silva
- Laboratório de Química Orgânica e Farmacêutica, Departamento de Ciências Químicas, Faculdade de Farmácia, Universidade do Porto, R. Jorge de Viterbo Ferreira 228, 4050-313 Porto, Portugal; (C.V.-B.); (F.C.); (E.S.); (M.M.M.P.)
- CIIMAR—Centro Interdisciplinar de Investigação Marinha e Ambiental, Avenida General Norton de Matos, S/N, 4450-208 Matosinhos, Portugal; (V.V.); (J.R.A.)
- Correspondence: (E.R.S.); (M.C.-d.-S.)
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13
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Outis M, Rosa V, Laia CAT, Lima JC, Barroso S, Carvalho AL, Calhorda MJ, Avilés T. Synthesis, Crystal Structure, and DFT Study of Two New Dinuclear Copper(I) Complexes Bearing Ar‐BIAN Ligands Functionalized with NO
2
Groups. Eur J Inorg Chem 2020. [DOI: 10.1002/ejic.202000423] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Affiliation(s)
- Mani Outis
- LAQV REQUIMTE Universidade Nova de Lisboa 2829–516 Caparica Portugal
| | - Vitor Rosa
- LAQV REQUIMTE Universidade Nova de Lisboa 2829–516 Caparica Portugal
| | - César A. T. Laia
- LAQV REQUIMTE Universidade Nova de Lisboa 2829–516 Caparica Portugal
| | - João Carlos Lima
- LAQV REQUIMTE Universidade Nova de Lisboa 2829–516 Caparica Portugal
| | - Sónia Barroso
- UCIBIO REQUIMTE Universidade Nova de Lisboa 2829–516 Caparica Portugal
| | | | - Maria José Calhorda
- BioISI ‐ Biosystems & Integrative Sciences Institute Departamento de Química e Bioquímica Universidade de Lisboa 1749–016 Lisboa Portugal
| | - Teresa Avilés
- LAQV REQUIMTE Universidade Nova de Lisboa 2829–516 Caparica Portugal
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14
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Elleuchi S, Ortiz de Luzuriaga I, Sanchez-Gonzalez Á, Lopez X, Jarraya K, Calhorda MJ, Gil A. Computational Studies on the Binding Preferences of Molybdenum(II) Phenanthroline Complexes with Duplex DNA. The Important Role of the Ancillary Ligands. Inorg Chem 2020; 59:12711-12721. [DOI: 10.1021/acs.inorgchem.0c01793] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/23/2022]
Affiliation(s)
- Sawssen Elleuchi
- Laboratoire de Chimie Inorganique, LR17ES07, Université de Sfax, Faculté de Sciences de Sfax, Route de Soukra Km 3.5, BP 1171, 3000 Sfax, Tunisia
| | - Iker Ortiz de Luzuriaga
- CIC nanoGUNE BRTA, Tolosa Hiribidea 76, E-20018 Donostia, San Sebastián, Euskadi, Spain
- Kimika Fakultatea, Euskal Herriko Unibertsitatea, P.K. 107, 20018 Donostia, San Sebastián, Euskadi, Spain
| | - Ángel Sanchez-Gonzalez
- Biosystems and Integrative Sciences Institute, Faculdade de Ciências, Universidade de Lisboa, Campo Grande, 1749-016 Lisbon, Portugal
| | - Xabier Lopez
- Kimika Fakultatea, Euskal Herriko Unibertsitatea, P.K. 107, 20018 Donostia, San Sebastián, Euskadi, Spain
- Donostia International Physics Center, P.K. 1072, 20080 Donostia, San Sebastián, Euskadi, Spain
| | - Khaled Jarraya
- Laboratoire de Chimie Inorganique, LR17ES07, Université de Sfax, Faculté de Sciences de Sfax, Route de Soukra Km 3.5, BP 1171, 3000 Sfax, Tunisia
| | - Maria José Calhorda
- Biosystems and Integrative Sciences Institute, Faculdade de Ciências, Universidade de Lisboa, Campo Grande, 1749-016 Lisbon, Portugal
| | - Adrià Gil
- CIC nanoGUNE BRTA, Tolosa Hiribidea 76, E-20018 Donostia, San Sebastián, Euskadi, Spain
- Biosystems and Integrative Sciences Institute, Faculdade de Ciências, Universidade de Lisboa, Campo Grande, 1749-016 Lisbon, Portugal
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15
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Pecak J, Eder W, Stöger B, Realista S, Martinho PN, Calhorda MJ, Linert W, Kirchner K. Synthesis, Characterization, and Catalytic Reactivity of {CoNO} 8 PCP Pincer Complexes. Organometallics 2020; 39:2594-2601. [PMID: 32742055 PMCID: PMC7388324 DOI: 10.1021/acs.organomet.0c00167] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/08/2020] [Indexed: 11/28/2022]
Abstract
![]()
The reaction of coordinatively
unsaturated Co(II) PCP pincer complexes
with nitric oxide leads to the formation of new, air-stable, diamagnetic mono nitrosyl compounds. The synthesis
and characterization of five- and four-coordinate Co(III) and Co(I)
nitrosyl pincer complexes based on three different ligand scaffolds
is described. Passing NO through a solution of [Co(PCPNMe-iPr)Cl], [Co(PCPO-iPr)Cl] or [Co(PCPCH2-iPr)Br] led to the
formation of the low-spin complex [Co(PCP-iPr)(NO)X]
with a strongly bent NO ligand. Treatment of the latter species with
(X = Cl, Br) AgBF4 led to chloride abstraction and formation
of cationic square-planar Co(I) complexes of the type [Co(PCP-iPr)(NO)]+ featuring a linear NO group. This
reaction could be viewed as a formal two electron reduction of the
metal center by the NO radical from Co(III) to Co(I), if NO is counted
as NO+. Hence, these systems can be described as {CoNO}8 according to the Enemark–Feltham convention. X-ray
structures, spectroscopic and electrochemical data of all nitrosyl
complexes are presented. Preliminary studies show that [Co(PCPNMe-iPr)(NO)]+ catalyzes efficiently
the reductive hydroboration of nitriles with pinacolborane (HBpin)
forming an intermediate {CoNO}8 hydride species.
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Affiliation(s)
- Jan Pecak
- Institute of Applied Synthetic Chemistry, Vienna University of Technology, Getreidemarkt 9, A-1060 Vienna, Austria
| | - Wolfgang Eder
- Institute of Applied Synthetic Chemistry, Vienna University of Technology, Getreidemarkt 9, A-1060 Vienna, Austria
| | - Berthold Stöger
- X-Ray Center, Vienna University of Technology, Getreidemarkt 9, A-1060 Vienna, Austria
| | - Sara Realista
- Instituto de Tecnologia Química e Biológica António Xavier, ITQB NOVA, Universidade Nova de Lisboa, Av. da República, 2780-157 Oeiras, Portugal
| | - Paulo N Martinho
- BioISI - Biosystems and Integrative Sciences Institute, DQB, Faculdade de Ciências, Universidade de Lisboa, Campo Grande, 1749-016 Lisboa, Portugal
| | - Maria José Calhorda
- BioISI - Biosystems and Integrative Sciences Institute, DQB, Faculdade de Ciências, Universidade de Lisboa, Campo Grande, 1749-016 Lisboa, Portugal
| | - Wolfgang Linert
- Institute of Applied Synthetic Chemistry, Vienna University of Technology, Getreidemarkt 9, A-1060 Vienna, Austria
| | - Karl Kirchner
- Institute of Applied Synthetic Chemistry, Vienna University of Technology, Getreidemarkt 9, A-1060 Vienna, Austria
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16
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Realista S, Oliveira B, Aldeias J, Fernández-Moreira V, Concepción Gimeno M, Viana AS, Calhorda MJ, Martinho PN. Structural and electronic properties in asymmetric binuclear Zn(II) amphiphilic compounds. J COORD CHEM 2020. [DOI: 10.1080/00958972.2020.1737325] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/24/2022]
Affiliation(s)
- Sara Realista
- Biosystems and Integrative Sciences Institute (BioISI), Faculdade de Ciências, Universidade de Lisboa, Lisboa, Portugal
| | - Bárbara Oliveira
- Biosystems and Integrative Sciences Institute (BioISI), Faculdade de Ciências, Universidade de Lisboa, Lisboa, Portugal
| | - Joana Aldeias
- Biosystems and Integrative Sciences Institute (BioISI), Faculdade de Ciências, Universidade de Lisboa, Lisboa, Portugal
| | - Vanesa Fernández-Moreira
- Departamento de Química Inorgánica, Instituto de Síntesis Química y Catálisis Homogénea (ISQCH, CSIC-Universidad de Zaragoza), Zaragoza, Spain
| | - M. Concepción Gimeno
- Departamento de Química Inorgánica, Instituto de Síntesis Química y Catálisis Homogénea (ISQCH, CSIC-Universidad de Zaragoza), Zaragoza, Spain
| | - Ana S. Viana
- Centro de Química Estrutural, Faculdade de Ciências, Universidade de Lisboa, Lisboa, Portugal
| | - Maria José Calhorda
- Biosystems and Integrative Sciences Institute (BioISI), Faculdade de Ciências, Universidade de Lisboa, Lisboa, Portugal
| | - Paulo N. Martinho
- Biosystems and Integrative Sciences Institute (BioISI), Faculdade de Ciências, Universidade de Lisboa, Lisboa, Portugal
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Rodrigues AI, Krishnamoorthy P, Gomes CSB, Carmona N, Di Paolo RE, Pander P, Pina J, Sérgio Seixas de Melo J, Dias FB, Calhorda MJ, Maçanita AL, Morgado J, Gomes PT. Luminescent halogen-substituted 2-(N-arylimino)pyrrolyl boron complexes: the internal heavy-atom effect. Dalton Trans 2020; 49:10185-10202. [DOI: 10.1039/d0dt01845g] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/22/2022]
Abstract
New luminescent halogen-substituted 2-iminopyrrolyl boron complexes exhibited an internal-heavy atom effect depending on the position of the halogen atom, and activity in OLEDs.
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18
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Rodrigues AI, Figueira CA, Gomes CSB, Suresh D, Ferreira B, Di Paolo RE, Pereira DDS, Dias FB, Calhorda MJ, Morgado J, Maçanita AL, Gomes PT. Boron complexes of aromatic 5-substituted iminopyrrolyl ligands: synthesis, structure, and luminescence properties. Dalton Trans 2019; 48:13337-13352. [PMID: 31429840 DOI: 10.1039/c9dt02718a] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/10/2023]
Abstract
A group of new mononuclear boron chelate compounds [BPh2{κ2N,N'-5-R-NC4H2-2-C(H)[double bond, length as m-dash]N-Ar}] (R = Ar = C6H57; R = C6H5, Ar = 2,6-iPr2C6H38; R = Anthracen-9-yl (Anthr), Ar = C6H59; R = Anthr, Ar = 2,6-iPr2C6H310) were synthesized via the reaction of B(C6H5)3 with the corresponding 5-substituted 2-(N-arylformimino)pyrrole ligand precursors 3-6. These complexes were prepared in order to evaluate the luminescence potential derived from the substitution of the position 5 of the pyrrolyl ring with an aromatic group. Compounds 7-10 were photophysically characterized in solution and in the solid state. The 5-phenyl-2-iminopyrrolyl-BPh2 complexes 7 and 8 are blue emitters and have enhanced photoluminescence quantum yields in the solid state (ΦPL) up to 0.95, whereas the 5-anthracenyl derivatives 9 and 10 have green-bluish fluorescence and a ΦPL of 0.49 and 0.24, respectively. DFT and TDDFT studies were performed, considering the effect of solvent and dispersion, in order to show how the geometries of compounds 7-10 changed from the ground to the excited state, to assign electronic transitions, and to rationalize the observed luminescence. These materials were applied in organic light-emitting diodes (OLEDs), with various device structures, the best showing an external quantum efficiency of 2.75% together with a high luminance of 23 530 cd m-2.
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Affiliation(s)
- Ana I Rodrigues
- Centro de Química Estrutural, Departamento de Engenharia Química, Instituto Superior Técnico, Universidade de Lisboa, Av. Rovisco Pais, 1049-001 Lisboa, Portugal.
| | - Cláudia A Figueira
- Centro de Química Estrutural, Departamento de Engenharia Química, Instituto Superior Técnico, Universidade de Lisboa, Av. Rovisco Pais, 1049-001 Lisboa, Portugal.
| | - Clara S B Gomes
- Centro de Química Estrutural, Departamento de Engenharia Química, Instituto Superior Técnico, Universidade de Lisboa, Av. Rovisco Pais, 1049-001 Lisboa, Portugal.
| | - D Suresh
- Centro de Química Estrutural, Departamento de Engenharia Química, Instituto Superior Técnico, Universidade de Lisboa, Av. Rovisco Pais, 1049-001 Lisboa, Portugal. and School of Chemical and Biotechnology, SASTRA University, Thanjavur - 613 401, India
| | - Bruno Ferreira
- Centro de Química Estrutural, Departamento de Engenharia Química, Instituto Superior Técnico, Universidade de Lisboa, Av. Rovisco Pais, 1049-001 Lisboa, Portugal.
| | - Roberto E Di Paolo
- Centro de Química Estrutural, Departamento de Engenharia Química, Instituto Superior Técnico, Universidade de Lisboa, Av. Rovisco Pais, 1049-001 Lisboa, Portugal.
| | | | - Fernando B Dias
- Department of Physics, Durham University, South Road, Durham DH1 3LE, UK
| | - Maria José Calhorda
- Centro de Química e Bioquímica and BioISI -Biosystems & Integrative Sciences Institute, Departamento de Química e Bioquímica, Faculdade de Ciências, Universidade de Lisboa, Campo Grande, Ed. C8, 1749-016 Lisboa, Portugal
| | - Jorge Morgado
- Instituto de Telecomunicações, Av. Rovisco Pais, 1049-001 Lisboa, Portugal and Department of Bioengineering, Instituto Superior Técnico, Universidade de Lisboa, Av. Rovisco Pais, 1049-001 Lisboa, Portugal
| | - António L Maçanita
- Centro de Química Estrutural, Departamento de Engenharia Química, Instituto Superior Técnico, Universidade de Lisboa, Av. Rovisco Pais, 1049-001 Lisboa, Portugal.
| | - Pedro T Gomes
- Centro de Química Estrutural, Departamento de Engenharia Química, Instituto Superior Técnico, Universidade de Lisboa, Av. Rovisco Pais, 1049-001 Lisboa, Portugal.
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19
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Realista S, Almeida JC, Milheiro SA, Bandeira NAG, Alves LG, Madeira F, Calhorda MJ, Martinho PN. Cover Feature: Co
II
Cryptates Convert CO
2
into CO and CH
4
under Visible Light (Chem. Eur. J. 50/2019). Chemistry 2019. [DOI: 10.1002/chem.201903441] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Affiliation(s)
- Sara Realista
- Centro de Química e Bioquímica, Faculdade de Ciências Universidade de Lisboa Campo Grande 1749-016 Lisboa Portugal
- BioISI—Biosystems & Integrative Sciences Institute, Faculdade de Ciências Universidade de Lisboa Campo Grande 1749-016 Lisboa Portugal
| | - Janaína C. Almeida
- Centro de Química e Bioquímica, Faculdade de Ciências Universidade de Lisboa Campo Grande 1749-016 Lisboa Portugal
- BioISI—Biosystems & Integrative Sciences Institute, Faculdade de Ciências Universidade de Lisboa Campo Grande 1749-016 Lisboa Portugal
| | - Sofia A. Milheiro
- Centro de Química e Bioquímica, Faculdade de Ciências Universidade de Lisboa Campo Grande 1749-016 Lisboa Portugal
- BioISI—Biosystems & Integrative Sciences Institute, Faculdade de Ciências Universidade de Lisboa Campo Grande 1749-016 Lisboa Portugal
| | - Nuno A. G. Bandeira
- Centro de Química e Bioquímica, Faculdade de Ciências Universidade de Lisboa Campo Grande 1749-016 Lisboa Portugal
- BioISI—Biosystems & Integrative Sciences Institute, Faculdade de Ciências Universidade de Lisboa Campo Grande 1749-016 Lisboa Portugal
| | - Luis G. Alves
- Centro de Química Estrutural Associação do Instituto Superior Técnico, para a Investigação e Desenvolvimento Av. Rovisco Pais 1 1049-001 Lisboa Portugal
| | - Filipe Madeira
- Centro de Química Estrutural Instituto Superior Técnico Universidade de Lisboa Av. Rovisco Pais 1 1049-001 Lisboa Portugal
| | - Maria José Calhorda
- Centro de Química e Bioquímica, Faculdade de Ciências Universidade de Lisboa Campo Grande 1749-016 Lisboa Portugal
- BioISI—Biosystems & Integrative Sciences Institute, Faculdade de Ciências Universidade de Lisboa Campo Grande 1749-016 Lisboa Portugal
| | - Paulo N. Martinho
- Centro de Química e Bioquímica, Faculdade de Ciências Universidade de Lisboa Campo Grande 1749-016 Lisboa Portugal
- BioISI—Biosystems & Integrative Sciences Institute, Faculdade de Ciências Universidade de Lisboa Campo Grande 1749-016 Lisboa Portugal
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20
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Realista S, Almeida JC, Milheiro SA, Bandeira NAG, Alves LG, Madeira F, Calhorda MJ, Martinho PN. Co
II
Cryptates Convert CO
2
into CO and CH
4
under Visible Light. Chemistry 2019; 25:11670-11679. [DOI: 10.1002/chem.201901806] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/18/2019] [Revised: 06/18/2019] [Indexed: 02/03/2023]
Affiliation(s)
- Sara Realista
- Centro de Química e Bioquímica, Faculdade de Ciências Universidade de Lisboa Campo Grande 1749-016 Lisboa Portugal
- BioISI—Biosystems & Integrative Sciences Institute, Faculdade de Ciências Universidade de Lisboa Campo Grande 1749-016 Lisboa Portugal
| | - Janaína C. Almeida
- Centro de Química e Bioquímica, Faculdade de Ciências Universidade de Lisboa Campo Grande 1749-016 Lisboa Portugal
- BioISI—Biosystems & Integrative Sciences Institute, Faculdade de Ciências Universidade de Lisboa Campo Grande 1749-016 Lisboa Portugal
| | - Sofia A. Milheiro
- Centro de Química e Bioquímica, Faculdade de Ciências Universidade de Lisboa Campo Grande 1749-016 Lisboa Portugal
- BioISI—Biosystems & Integrative Sciences Institute, Faculdade de Ciências Universidade de Lisboa Campo Grande 1749-016 Lisboa Portugal
| | - Nuno A. G. Bandeira
- Centro de Química e Bioquímica, Faculdade de Ciências Universidade de Lisboa Campo Grande 1749-016 Lisboa Portugal
- BioISI—Biosystems & Integrative Sciences Institute, Faculdade de Ciências Universidade de Lisboa Campo Grande 1749-016 Lisboa Portugal
| | - Luis G. Alves
- Centro de Química Estrutural Associação do Instituto Superior Técnico, para a Investigação e Desenvolvimento Av. Rovisco Pais 1 1049-001 Lisboa Portugal
| | - Filipe Madeira
- Centro de Química Estrutural Instituto Superior Técnico Universidade de Lisboa Av. Rovisco Pais 1 1049-001 Lisboa Portugal
| | - Maria José Calhorda
- Centro de Química e Bioquímica, Faculdade de Ciências Universidade de Lisboa Campo Grande 1749-016 Lisboa Portugal
- BioISI—Biosystems & Integrative Sciences Institute, Faculdade de Ciências Universidade de Lisboa Campo Grande 1749-016 Lisboa Portugal
| | - Paulo N. Martinho
- Centro de Química e Bioquímica, Faculdade de Ciências Universidade de Lisboa Campo Grande 1749-016 Lisboa Portugal
- BioISI—Biosystems & Integrative Sciences Institute, Faculdade de Ciências Universidade de Lisboa Campo Grande 1749-016 Lisboa Portugal
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Quintal S, Pires da Silva MJ, Martins SRM, Sales R, Félix V, Drew MGB, Meireles M, Mourato AC, Nunes CD, Saraiva MS, Machuqueiro M, Calhorda MJ. Molybdenum(ii) complexes with p-substituted BIAN ligands: synthesis, characterization, biological activity and computational study. Dalton Trans 2019; 48:8449-8463. [PMID: 31116201 DOI: 10.1039/c9dt00469f] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
New complexes [Mo(η3-C3H5)X(CO)2(4-Y-BIAN)] (4-Y-BIAN = bis(4-Y-phenyl)-acenaphthenequinonediimine), with X = Br and Y = H, Me, OMe, COOH and X = Cl, Y = OMe, as well as the cation with X = NCMe and Y = OMe were synthesized, expanding the scope of this family. Two single crystal X-ray structures (X = Br, Y = Me, OMe) display a less symmetric arrangement (axial isomer), where one N donor atom is trans to the allyl group and the second to one CO. DFT studies showed similar energies for the two possible isomers of the complexes, with a very small preference for the observed axial isomer. The HOMO of the complexes is localized in the metal and the HOMO-1 of the oxidized species has a contribution from the BIAN ligand, while the LUMO is fully localized in BIAN. Electrochemical studies showed one process corresponding to the oxidation of Mo(ii) to Mo(iii) for complexes with X = Br, Y = H, Me, and two oxidation reactions for those with X = Br, Y = Cl, OMe, while the COOH derivative exhibited no oxidation wave. The antitumor effect of the complexes with X = Br was tested in cancer lines, and the H and OMe complexes were particularly active, with EC50 values below 8 μM in HeLa cell lines. The DNA binding constants determined by titration experiments were comparable with those of doxorubicin and ethidium bromide, suggesting a mechanism of action based on intercalation in DNA.
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Affiliation(s)
- Susana Quintal
- Centro de Química e Bioquímica, DQB, Faculdade de Ciências, Universidade de Lisboa, Campo Grande, 1749-016 Lisboa, Portugal.
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22
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Vicente AI, Wu X, Ortin Y, Ferreira LP, Carvalho MDD, Realista S, Barker A, Morgan GG, Galamba N, Costa PJ, Calhorda MJ, Martinho PN. Directing self-assembly in solution towards improved cooperativity in Fe(iii) complexes with amphiphilic tridentate ligands. Dalton Trans 2019; 48:4239-4247. [PMID: 30843914 DOI: 10.1039/c9dt00032a] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
An amphiphilic iron(iii) complex with a tridentate Schiff-base ligand was prepared by condensation of a hexadecyloxy functionalised salycylaldehyde with a diamine followed by complexation with FeCl2 and anion methathesis with NaClO4. The complex shows spin crossover both in the solid state and solution. However in solution self-assembly and consequently aggregation of individual molecules form concentration dependent particles with sizes of 300 nm for higher concentrations, or 5 nm for lower concentrations. Aggregate formation was confirmed by NANO-flex 180° DLS Size, scan-rate dependent cyclic voltammetry and scanning electron microscopy. Molecular simulations were used to investigate the self-assembly of the complex in solution, including the role of residual water molecules. The simulations showed the self-assembly of reverse micelle-like structures when a small water cluster is inserted in solution, whereas no large aggregates formed in dehydrated environments. The perchlorate anions were found near the metal centres, stabilizing the aggregates around the water pool. Simulations of pre-assembled structures further showed the lack of stability of large aggregates in the absence of water. The larger aggregates promoted efficient communication between the iron(iii) centres and the compound displayed spin crossover in solution at around 220 K with a 10 K hysteresis window, as measured by NMR and SQUID magnetometry.
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Affiliation(s)
- Ana I Vicente
- Centro de Química e Bioquímica, Faculdade de Ciências, Universidade de Lisboa Campo Grande, 1749-016 Lisboa, Portugal.
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23
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Silva ER, Ferreira O, Ramalho PA, Azevedo NF, Bayón R, Igartua A, Bordado JC, Calhorda MJ. Eco-friendly non-biocide-release coatings for marine biofouling prevention. Sci Total Environ 2019; 650:2499-2511. [PMID: 30293004 DOI: 10.1016/j.scitotenv.2018.10.010] [Citation(s) in RCA: 21] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/25/2018] [Revised: 09/30/2018] [Accepted: 10/01/2018] [Indexed: 05/22/2023]
Abstract
Environmental concerns have been changing the way of looking for solutions to problems. The hydrosphere, together with its biosphere, has been feeling the impact of many pollutants, used for instance in the marine industry for economic reasons or lack of knowledge of their effects. In particular biocides, applied as coatings in paints, are released into the waters becoming toxic and persistent extending their action to an area far beyond the initial coated surface they should protect. In order to minimize these side effects, two biocides, Irgarol (I) and Econea (E), were covalently attached to polyurethane (PU) and foul-release silicone based (PDMS) marine paints through an isocyanate linker. Their antifouling bioactivity was better in PDMS coatings, both for single (Econea) and combined biocides (E/I ratio = 1.5) with contents lower than 0.6 wt%. The treated samples remained almost clean after more than one year immersion in the Portuguese shore of the Atlantic Ocean, and after about 24 weeks under the tropical conditions of Singapore (Fouling rate < 1%). Complementary biofilm adhesion susceptibility tests against Pseudoalteromonas tunicata D2 showed adhesion reduction higher than 90% for PU formulations containing single biocides and close to 100% for PDMS with combined biocides. The eco-toxicity assessment evidenced a low environmental impact, in accordance with the European standards. In addition, shipping field trial tests showed the best antifouling performance for the Econea-based PDMS formulations (E = 0.6 wt%), which remained clean for about nine months in open seawaters, proving the efficacy of this non-release strategy, when applied under dynamic conditions.
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Affiliation(s)
- E R Silva
- Centro de Química e Bioquímica, Faculdade de Ciências, Universidade de Lisboa, Campo Grande, 1740-016 Lisboa, Portugal; BioISI, Biosystems & Integrative Sciences Institute Faculdade de Ciências, Universidade de Lisboa, Campo Grande, 1749-016 Lisboa, Portugal; Instituto Superior Técnico, CERENA, UL, Av. Rovisco Pais 1, 1049-001 Lisboa, Portugal.
| | - O Ferreira
- Centro de Química e Bioquímica, Faculdade de Ciências, Universidade de Lisboa, Campo Grande, 1740-016 Lisboa, Portugal; BioISI, Biosystems & Integrative Sciences Institute Faculdade de Ciências, Universidade de Lisboa, Campo Grande, 1749-016 Lisboa, Portugal; Instituto Superior Técnico, CERENA, UL, Av. Rovisco Pais 1, 1049-001 Lisboa, Portugal
| | - P A Ramalho
- LEPABE - Laboratory for Process Engineering, Environment, Biotechnology and Energy, DEQ, Faculty of Engineering, University of Porto, Rua Dr. Roberto Frias, 4200-465 Porto, Portugal
| | - N F Azevedo
- LEPABE - Laboratory for Process Engineering, Environment, Biotechnology and Energy, DEQ, Faculty of Engineering, University of Porto, Rua Dr. Roberto Frias, 4200-465 Porto, Portugal
| | - R Bayón
- Fundación TEKNIKER, IK4-TEKNIKER, C/Ignacio Goenaga, 5, 20600 Eibar, Guipuzcoa, Spain
| | - A Igartua
- Fundación TEKNIKER, IK4-TEKNIKER, C/Ignacio Goenaga, 5, 20600 Eibar, Guipuzcoa, Spain
| | - J C Bordado
- Instituto Superior Técnico, CERENA, UL, Av. Rovisco Pais 1, 1049-001 Lisboa, Portugal
| | - M J Calhorda
- Centro de Química e Bioquímica, Faculdade de Ciências, Universidade de Lisboa, Campo Grande, 1740-016 Lisboa, Portugal; BioISI, Biosystems & Integrative Sciences Institute Faculdade de Ciências, Universidade de Lisboa, Campo Grande, 1749-016 Lisboa, Portugal
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24
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Marreiros J, Diaz-Couce M, Ferreira MJ, Vaz PD, Calhorda MJ, Nunes CD. Synthesis and catalytic activity of Mo(II) complexes of α-diimines intercalated in layered double hydroxides. Inorganica Chim Acta 2019. [DOI: 10.1016/j.ica.2018.10.062] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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25
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Taylor JO, Veenstra FLP, Chippindale AM, Calhorda MJ, Hartl F. Group 6 Metal Complexes as Electrocatalysts of CO2 Reduction: Strong Substituent Control of the Reduction Path of [Mo(η3-allyl)(CO)2(x,x′-dimethyl-2,2′-bipyridine)(NCS)] (x = 4–6). Organometallics 2018. [DOI: 10.1021/acs.organomet.8b00676] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- James O. Taylor
- Department of Chemistry, University of Reading, Reading, RG6 6AD, United Kingdom
| | - Florentine L. P. Veenstra
- Department of Chemistry, University of Reading, Reading, RG6 6AD, United Kingdom
- Institute for Chemical and Bioengineering, Department of Chemistry and Applied Biosciences, ETH Hönggerberg, Vladimir-Prelog-Weg 1, 8093 Zurich, Switzerland
| | - Ann M. Chippindale
- Department of Chemistry, University of Reading, Reading, RG6 6AD, United Kingdom
| | - Maria José Calhorda
- Centro de Química e Bioquímica and BioISI - Biosystems & Integrative Sciences Institute, Departamento de Quı́mica e Bioquı́mica, Faculdade de Ciências, Universidade de Lisboa, 1749-016 Lisboa, Portugal
| | - František Hartl
- Department of Chemistry, University of Reading, Reading, RG6 6AD, United Kingdom
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Hartl F, Bakker MJ, Santos VF, Costa PJ, Calhorda MJ. Accurate Description of Low-Lying Excited States in a Series of Photoreactive Clusters [Os 3(CO) 10(α-diimine)] by DFT Calculations. Inorg Chem 2018; 57:11704-11716. [PMID: 30188701 DOI: 10.1021/acs.inorgchem.8b01847] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
Density functional theory (DFT) calculations were performed on clusters [Os3(CO)10(α-diimine)], for α-diimine = 2,2'-bipyridine (BPY), N-isopropyl 2-iminomethylpyridine (IMP), and N, N'-diisopropyl-l,4-diaza-1,3-butadiene (DAB), together with their spectroscopic study. This important family of clusters is known to convert upon irradiation with visible light into short-lived biradicals and long-lived zwitterions from a σπ* (SBLCT) excited state that has not been described accurately thus far by quantum mechanical calculations. On the basis of the combined DFT, UV-vis absorption, and resonance Raman data, the lowest-lying visible absorption band is assigned to a σ(Os1-Os3)-to-π*(α-diimine) CT transition, for α-diimine = bpy and IMP, and to a strongly delocalized σ(Os1-Os3)π*-to-σ*(Os1-Os3)π* transition for conjugated nonaromatic α-diimine = DAB. The DFT calculations rationalize the experimentally determined characteristics of this electronic transition in the studied series: (i) The corresponding absorption band is the dominant feature in the visible spectral region. (ii) The CT character of the electronic excitation declines from α-diimine = bpy to IMP and vanishes for DAB. (iii) The excitation energies decrease in the order α-diimine = DAB > BPY > IMP. (iv) The oscillator strength shrinks in the order α-diimine = DAB > IMP > BPY. Reference photoreaction quantum yields measured accurately for the formation of a cluster zwitterion from [Os3(CO)10(IMP)] in strongly coordinating pyridine demonstrate that the optical population of the lowest-energy 1σπ* and relaxed 3σπ* excited states in the DFT model scheme is still capable of inducing the initial homolytic Os1-Os3 σ-bond splitting, although less efficiently than the optical excitation into neighbor higher-lying electronic transitions due to a higher potential barrier for the reaction from a dissociative (σσ*) state.
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Affiliation(s)
- František Hartl
- Department of Chemistry , University of Reading , Whiteknights , Reading , RG6 6AD , United Kingdom
| | - Maarten J Bakker
- Institute of Molecular Chemistry , University of Amsterdam , Nieuwe Achtergracht 166 , 1018 WV Amsterdam , The Netherlands
| | - Vanessa F Santos
- Centro de Química e Bioquímica and BioISI - Biosystems & Integrative Sciences Institute, Departamento de Química e Bioquímica, Faculdade de Ciências , Universidade de Lisboa , 1749-016 Lisboa , Portugal.,Instituto de Química , Universidade Federal do Rio de Janeiro , Rio de Janeiro , Rio de Janeiro 21941-909 , Brazil
| | - Paulo J Costa
- Centro de Química e Bioquímica and BioISI - Biosystems & Integrative Sciences Institute, Departamento de Química e Bioquímica, Faculdade de Ciências , Universidade de Lisboa , 1749-016 Lisboa , Portugal
| | - Maria José Calhorda
- Centro de Química e Bioquímica and BioISI - Biosystems & Integrative Sciences Institute, Departamento de Química e Bioquímica, Faculdade de Ciências , Universidade de Lisboa , 1749-016 Lisboa , Portugal
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27
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Saraiva MS, Nunes CD, Félix V, Ribeiro APC, Castro CN, Calhorda MJ. Molybdenum(II) Complexes with α‐Diimines: Catalytic Activity in Organic and Ionic Liquid Solvents. Eur J Inorg Chem 2018. [DOI: 10.1002/ejic.201800700] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Affiliation(s)
- Marta S. Saraiva
- Centro de Química e Bioquímica DQB Universidade de Lisboa Campo Grande 1749‐016 Lisboa Portugal
- BioISI ‐ Biosystems and Integrative Sciences Institute Faculdade de Ciências Universidade de Lisboa Campo Grande 1749‐016 Lisboa Portugal
| | - Carla D. Nunes
- Centro de Química e Bioquímica DQB Universidade de Lisboa Campo Grande 1749‐016 Lisboa Portugal
- Centro de Química Estrutural Faculdade de Ciências e Instituto Superior Técnico Universidade de Lisboa 1049‐001 Lisboa Portugal
| | - Vítor Félix
- Department of Chemistry CICECO – Aveiro Institute of Materials University of Aveiro 3810‐193 Aveiro Portugal
| | - Ana P. C. Ribeiro
- Centro de Química Estrutural Faculdade de Ciências e Instituto Superior Técnico Universidade de Lisboa 1049‐001 Lisboa Portugal
| | - Carlos Nieto Castro
- Centro de Química Estrutural Faculdade de Ciências e Instituto Superior Técnico Universidade de Lisboa 1049‐001 Lisboa Portugal
| | - Maria José Calhorda
- Centro de Química e Bioquímica DQB Universidade de Lisboa Campo Grande 1749‐016 Lisboa Portugal
- BioISI ‐ Biosystems and Integrative Sciences Institute Faculdade de Ciências Universidade de Lisboa Campo Grande 1749‐016 Lisboa Portugal
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Martins FF, Joseph A, Diogo HP, Minas da Piedade ME, Ferreira LP, Carvalho MD, Barroso S, Romão MJ, Calhorda MJ, Martinho PN. Irreversible Magnetic Behaviour Caused by the Thermosalient Phenomenon in an Iron(III) Spin Crossover Complex. Eur J Inorg Chem 2018. [DOI: 10.1002/ejic.201800605] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
Affiliation(s)
- Frederico F. Martins
- Centro de Química e Bioquímica; Faculdade de Ciências; Universidade de Lisboa; Campo Grande 1749-016 Lisboa Portugal
- BioISI - Biosystems and Integrative Sciences Institute; Faculty of Sciences; Universidade de Lisboa; Campo Grande C8 bdg 1749-016 Lisboa Portugal
| | - Abhinav Joseph
- Centro de Química e Bioquímica; Faculdade de Ciências; Universidade de Lisboa; Campo Grande 1749-016 Lisboa Portugal
- Centro de Química Estrutural; Faculdade de Ciências e Instituto Superior Técnico; Universidade de Lisboa; Campo Grande 1749-016 Lisboa Portugal
| | - Hermínio P. Diogo
- Centro de Química Estrutural; Instituto Superior Técnico; Universidade de Lisboa; 1049-001 Lisboa Portugal
| | - Manuel E. Minas da Piedade
- Centro de Química e Bioquímica; Faculdade de Ciências; Universidade de Lisboa; Campo Grande 1749-016 Lisboa Portugal
- Centro de Química Estrutural; Faculdade de Ciências e Instituto Superior Técnico; Universidade de Lisboa; Campo Grande 1749-016 Lisboa Portugal
| | - Liliana P. Ferreira
- BioISI - Biosystems and Integrative Sciences Institute; Faculty of Sciences; Universidade de Lisboa; Campo Grande C8 bdg 1749-016 Lisboa Portugal
- Department of Physics; University of Coimbra; 3004-516 Coimbra Portugal
| | - Maria Deus Carvalho
- Centro de Química e Bioquímica; Faculdade de Ciências; Universidade de Lisboa; Campo Grande 1749-016 Lisboa Portugal
| | - Sónia Barroso
- UCIBIO, REQUIMTE; Departamento de Química, Faculdade de Ciências e Tecnologia; Universidade Nova de Lisboa; 2829-516 Caparica Portugal
| | - Maria João Romão
- UCIBIO, REQUIMTE; Departamento de Química, Faculdade de Ciências e Tecnologia; Universidade Nova de Lisboa; 2829-516 Caparica Portugal
| | - Maria José Calhorda
- Centro de Química e Bioquímica; Faculdade de Ciências; Universidade de Lisboa; Campo Grande 1749-016 Lisboa Portugal
- BioISI - Biosystems and Integrative Sciences Institute; Faculty of Sciences; Universidade de Lisboa; Campo Grande C8 bdg 1749-016 Lisboa Portugal
| | - Paulo N. Martinho
- Centro de Química e Bioquímica; Faculdade de Ciências; Universidade de Lisboa; Campo Grande 1749-016 Lisboa Portugal
- BioISI - Biosystems and Integrative Sciences Institute; Faculty of Sciences; Universidade de Lisboa; Campo Grande C8 bdg 1749-016 Lisboa Portugal
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Vicente AI, Ferreira LP, Carvalho MDD, Rodrigues VHN, Dîrtu MM, Garcia Y, Calhorda MJ, Martinho PN. Selecting the spin crossover profile with controlled crystallization of mononuclear Fe(iii) polymorphs. Dalton Trans 2018; 47:7013-7019. [PMID: 29737355 DOI: 10.1039/c8dt00227d] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Two polymorphic species of the [Fe(5-Br-salEen)2]ClO4 compound were obtained, each of them being selectively recovered after evaporation of the solvent at a controlled rate. While polymorph 1a is formed during slow evaporation, fast evaporation favors polymorph 1b. The importance of the evaporation rate was recognized after detailed studies of the reaction temperature, solvent evaporation rate and crystallization temperature effects. The complex in the new polymorphic form 1a showed an abrupt spin crossover at 172 K with a small 1 K hysteresis window and over a narrow 10 K range. 57Fe Mössbauer spectroscopy and differential scanning calorimetry, complemented by X-ray studies for both the high-spin and low-spin forms, were used to further characterize the new polymorphic phase 1a. Both polymorphs are based on the same Fe(iii) complex cation hydrogen bonded to the perchlorate anion. These units are loosely bound in the crystals via weak interactions. In the new polymorph 1a, the hydrogen bonds are stronger, while the weak hydrogen and halogen bonds, as well as π-π stacking, create a cooperative network, not present in 1b, responsible for the spin transition profile.
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Affiliation(s)
- Ana I Vicente
- Centro de Química e Bioquímica, Faculdade de Ciências, Universidade de Lisboa, Campo Grande, 1749-016 Lisboa, Portugal.
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30
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Meneses G, Widmann C, Cunha T, Gil A, Ferreira da Silva F, Calhorda MJ, Limão-Vieira P. Unravelling the dissociation pathways of acetic acid upon electron transfer in potassium collisions: experimental and theoretical studies. Phys Chem Chem Phys 2018; 19:1083-1088. [PMID: 27942639 DOI: 10.1039/c6cp06375f] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Electron transfer in alkali-molecule collisions with gas phase acetic acid and its deuterated analogues resulting in OH- formation requires considerable internal rearrangement in the temporary negative ion. At a collision energy well above the threshold of negative ion formation, electron transfer from potassium to CH3COOH/CH3COOD and CD3COOH results not only in H transfer from CH3 to COOH/COOD, but also in H release from COOH and subsequent rearrangement to eliminate OH-. These processes are also investigated by theoretical post-Hartree-Fock and DFT calculations. The combination of both studies reveals that the most favourable intermediate mechanism occurs via diol formation. Such intramolecular H transfer is reported here for the first time in the context of electron transfer induced dissociation experiments in alkali-molecule collisions. A comprehensive fragmentation study is presented and dissociation mechanisms are suggested.
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Affiliation(s)
- G Meneses
- Laboratório de Colisões Atómicas e Moleculares, CEFITEC Departamento de Física, Faculdade de Ciências e Tecnologia, Universidade NOVA de Lisboa Campus de Caparica, 2829-516 Caparica, Portugal.
| | - C Widmann
- Laboratório de Colisões Atómicas e Moleculares, CEFITEC Departamento de Física, Faculdade de Ciências e Tecnologia, Universidade NOVA de Lisboa Campus de Caparica, 2829-516 Caparica, Portugal.
| | - T Cunha
- Laboratório de Colisões Atómicas e Moleculares, CEFITEC Departamento de Física, Faculdade de Ciências e Tecnologia, Universidade NOVA de Lisboa Campus de Caparica, 2829-516 Caparica, Portugal.
| | - A Gil
- Centro de Química e Bioquímica, Faculdade de Ciências, Universidade de Lisboa, Campo Grande, 1749-016 Lisboa, Portugal.
| | - F Ferreira da Silva
- Laboratório de Colisões Atómicas e Moleculares, CEFITEC Departamento de Física, Faculdade de Ciências e Tecnologia, Universidade NOVA de Lisboa Campus de Caparica, 2829-516 Caparica, Portugal.
| | - M J Calhorda
- Centro de Química e Bioquímica, Faculdade de Ciências, Universidade de Lisboa, Campo Grande, 1749-016 Lisboa, Portugal.
| | - P Limão-Vieira
- Laboratório de Colisões Atómicas e Moleculares, CEFITEC Departamento de Física, Faculdade de Ciências e Tecnologia, Universidade NOVA de Lisboa Campus de Caparica, 2829-516 Caparica, Portugal.
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31
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Barroso S, Coelho AM, Adão P, Calhorda MJ, Martins AM. Radical reactions of diamine bis(phenolate) vanadium(iii) complexes. Solid state binding of O 2 to form a vanadium(v) peroxo complex. Dalton Trans 2017; 46:9692-9704. [PMID: 28714510 DOI: 10.1039/c7dt01699a] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/06/2023]
Abstract
[VCl3(THF)3] reacted with the sodium salt of a tripodal diamine bisphenolate ligand precursor Na2L2 to give a paramagnetic d2 complex [V(L2)Cl] (2). The reaction of 2 with oxygen is strongly dependent on the experimental conditions, affording [VO(L2)Cl] (6) or [V(η2-O2)(L2)Cl] (7). The formation of 7 involves the direct addition of O2 to V(iii) in the solid state with oxidation to V(v) without significantly disturbing the structure of 2. DFT calculations showed that compound 7 is an intermediate in the formation of 6 from 2. The reaction involves the cleavage of the η1-O-O bond in a proposed dimeric species. The overall reaction of 2 moles of vanadium(iii), complex 2, and one mole of O2 to yield two moles of product 6 is a favourable process with ΔG298 = -38.3 kcal mol-1. 7 is the first non-oxido peroxidovanadium(v) complex obtained directly from the reaction of a crystal and the second example of a structurally characterized complex of that type. Reactions of V(L1)Cl (1) and V(L2)Cl (2) with one equivalent of the nitroxyl radical TEMPO in toluene also result in the formation of oxido V(v) complexes, VO(L1)Cl (5) and VO(L2)Cl (6). The reaction of VO(OiPr)3 with Na2L2 afforded [VO(L2)(OiPr)] (8) in high yield. A major isomer having the V[double bond, length as m-dash]O moiety in the equatorial plane was characterised by X-ray diffraction although solution NMR data showed the presence of a minor species with the oxido ligand trans to the tripodal nitrogen, as in 6. Complexes 6 and 8 are very active and selective sulfoxidation catalysts of thioanisole, but no enantiomeric excess was obtained.
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Affiliation(s)
- Sónia Barroso
- Centro de Química Estrutural, Instituto Superior Técnico, Universidade de Lisboa, Av. Rovisco Pais, 1049-001 Lisboa, Portugal.
| | - Ana M Coelho
- Centro de Química Estrutural, Instituto Superior Técnico, Universidade de Lisboa, Av. Rovisco Pais, 1049-001 Lisboa, Portugal.
| | - Pedro Adão
- Centro de Química Estrutural, Instituto Superior Técnico, Universidade de Lisboa, Av. Rovisco Pais, 1049-001 Lisboa, Portugal.
| | - Maria José Calhorda
- Centro de Química e Bioquímica, DQB, Faculdade de Ciências, Universidade de Lisboa, Campo Grande, Ed. C8, 1749-016 Lisboa, Portugal
| | - Ana M Martins
- Centro de Química Estrutural, Instituto Superior Técnico, Universidade de Lisboa, Av. Rovisco Pais, 1049-001 Lisboa, Portugal.
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32
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Galliot A, Gil A, Calhorda MJ. Effects of oxygenation on the intercalation of 1,10-phenanthroline-5,6/4,7-dione between DNA base pairs: a computational study. Phys Chem Chem Phys 2017. [PMID: 28621352 DOI: 10.1039/c7cp00532f] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/25/2022]
Abstract
The effects of oxygen in positions 4,7 and 5,6 of phenanthroline have been studied computationally when this ligand intercalates between DNA base pairs. Our results indicate that solvation energy could be the driving force of the process and thus, it can be also related with the cytotoxicity of the drug.
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Affiliation(s)
- Aurellia Galliot
- Centro de Química e Bioquímica
- DQB
- Faculdade de Ciências
- Universidade de Lisboa
- Campo Grande 1749-016 Lisboa
| | - Adrià Gil
- Centro de Química e Bioquímica
- DQB
- Faculdade de Ciências
- Universidade de Lisboa
- Campo Grande 1749-016 Lisboa
| | - Maria José Calhorda
- Centro de Química e Bioquímica
- DQB
- Faculdade de Ciências
- Universidade de Lisboa
- Campo Grande 1749-016 Lisboa
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33
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Diaz-Couce M, Marreiros J, Ferreira MJ, Vaz PD, Nunes CD, Calhorda MJ. New heterogeneous catalysts with Mo(II) intercalated in layered double hydroxides. Inorganica Chim Acta 2017. [DOI: 10.1016/j.ica.2016.07.030] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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34
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Realista S, Quintal S, Martinho PN, Melato AI, Gil A, Esteves T, Carvalho MDD, Ferreira LP, Vaz PD, Calhorda MJ. Electrochemical studies and potential anticancer activity in ferrocene derivatives. J COORD CHEM 2016. [DOI: 10.1080/00958972.2016.1257125] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/20/2022]
Affiliation(s)
- Sara Realista
- Centro de Química e Bioquímica, Faculdade de Ciências, Universidade de Lisboa, Lisboa, Portugal
| | - Susana Quintal
- Centro de Química e Bioquímica, Faculdade de Ciências, Universidade de Lisboa, Lisboa, Portugal
- Departamento de Química Inorgânica, Universidade Federal Fluminense, Niterói, Brazil
| | - Paulo N. Martinho
- Centro de Química e Bioquímica, Faculdade de Ciências, Universidade de Lisboa, Lisboa, Portugal
| | - Ana I. Melato
- Centro de Química e Bioquímica, Faculdade de Ciências, Universidade de Lisboa, Lisboa, Portugal
| | - Adrià Gil
- Centro de Química e Bioquímica, Faculdade de Ciências, Universidade de Lisboa, Lisboa, Portugal
| | - Teresa Esteves
- Centro de Química e Bioquímica, Faculdade de Ciências, Universidade de Lisboa, Lisboa, Portugal
| | - Maria de Deus Carvalho
- Centro de Química e Bioquímica, Faculdade de Ciências, Universidade de Lisboa, Lisboa, Portugal
| | - Liliana P. Ferreira
- Biosystems and Integrative Sciences Institute (BioISI), Faculdade de Ciências, Universidade de Lisboa, Lisboa, Portugal
- Physics Department, University of Coimbra, Coimbra, Portugal
| | - Pedro D. Vaz
- Centro de Química e Bioquímica, Faculdade de Ciências, Universidade de Lisboa, Lisboa, Portugal
| | - Maria José Calhorda
- Centro de Química e Bioquímica, Faculdade de Ciências, Universidade de Lisboa, Lisboa, Portugal
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35
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Vicente AI, Joseph A, Ferreira LP, de Deus Carvalho M, Rodrigues VHN, Duttine M, Diogo HP, Minas da Piedade ME, Calhorda MJ, Martinho PN. Dynamic spin interchange in a tridentate Fe(iii) Schiff-base compound. Chem Sci 2016; 7:4251-4258. [PMID: 30155072 PMCID: PMC6013817 DOI: 10.1039/c5sc04577k] [Citation(s) in RCA: 39] [Impact Index Per Article: 4.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/27/2015] [Accepted: 03/16/2016] [Indexed: 11/21/2022] Open
Abstract
The thermosalient effect is still a rare and poorly understood phenomenon, where crystals suddenly jump, bend, twist or explode upon undergoing a thermally activated phase transition. The synthesis and characterisation of the new spin transition Fe(iii) compound [Fe(5-Br-salEen)2][ClO4] (salEen = N-ethyl-N-(2-aminoethyl)salicylaldiminate) is described and its thermosalient behaviour reported. It is the first example of a thermosalient effect with a spin transition and magnetic, calorimetric, diffraction, microscopy and computational studies are used to characterise these effects. Both thermosalient effect and spin transition occur around 320 K upon heating and are accompanied by an anisotropic unit cell change with conservation of crystal symmetry that causes a large enough stress of the crystal lattice to induce crystal explosion. This stress can ultimately be traced back to a diffusionless and distortive structural perturbation resulting in a coupled spin transition-thermosalient effect.
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Affiliation(s)
- Ana I Vicente
- Centro de Química e Bioquímica , Faculdade de Ciências , Universidade de Lisboa , Campo Grande , 1749-016 Lisboa , Portugal .
| | - Abhinav Joseph
- Centro de Química e Bioquímica , Faculdade de Ciências , Universidade de Lisboa , Campo Grande , 1749-016 Lisboa , Portugal .
| | - Liliana P Ferreira
- BioISI , Faculdade de Ciências , Universidade de Lisboa , Campo Grande , 1749-016 Lisboa , Portugal
- Department of Physics , University of Coimbra , 3004-516 Coimbra , Portugal
| | - Maria de Deus Carvalho
- Centro de Química e Bioquímica , Faculdade de Ciências , Universidade de Lisboa , Campo Grande , 1749-016 Lisboa , Portugal .
| | | | - Mathieu Duttine
- CNRS , Université de Bordeaux , ICMCB , 87 avenue du Dr. A. Schweitzer , Pessac F-33608 , France
| | - Hermínio P Diogo
- Centro de Química Estrutural , Instituto Superior Técnico , Universidade de Lisboa , 1049-001 Lisboa , Portugal
| | - Manuel E Minas da Piedade
- Centro de Química e Bioquímica , Faculdade de Ciências , Universidade de Lisboa , Campo Grande , 1749-016 Lisboa , Portugal .
| | - Maria José Calhorda
- Centro de Química e Bioquímica , Faculdade de Ciências , Universidade de Lisboa , Campo Grande , 1749-016 Lisboa , Portugal .
| | - Paulo N Martinho
- Centro de Química e Bioquímica , Faculdade de Ciências , Universidade de Lisboa , Campo Grande , 1749-016 Lisboa , Portugal .
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36
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Esteves CV, Mateus P, André V, Bandeira NAG, Calhorda MJ, Ferreira LP, Delgado R. Di- versus Trinuclear Copper(II) Cryptate for the Uptake of Dicarboxylate Anions. Inorg Chem 2016; 55:7051-60. [DOI: 10.1021/acs.inorgchem.6b00945] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/04/2023]
Affiliation(s)
- Catarina V. Esteves
- Instituto de Tecnologia
Química e Biológica António Xavier, Universidade Nova de Lisboa, Av. da República, 2780-157 Oeiras, Portugal
| | - Pedro Mateus
- Instituto de Tecnologia
Química e Biológica António Xavier, Universidade Nova de Lisboa, Av. da República, 2780-157 Oeiras, Portugal
| | - Vânia André
- Centro de Química Estrutural, Instituto Superior Técnico, Universidade de Lisboa, Avenida Rovisco Pais, 1049-001 Lisboa, Portugal
| | - Nuno A. G. Bandeira
- Centro de Química Estrutural, Instituto Superior Técnico, Universidade de Lisboa, Avenida Rovisco Pais, 1049-001 Lisboa, Portugal
- Institut Català d’Investigació Química
(ICIQ), Barcelona Institute of Science and Technology (BIST), 16,
Av. Països Catalans, 43007 Tarragona, Spain
- Centro de Química
e Bioquímica, DQB, Faculdade de Ciências, Universidade de Lisboa, 1749-016 Lisboa, Portugal
| | - Maria José Calhorda
- Centro de Química
e Bioquímica, DQB, Faculdade de Ciências, Universidade de Lisboa, 1749-016 Lisboa, Portugal
| | - Liliana P. Ferreira
- BioISI, Faculdade de Ciências, Universidade de Lisboa, Campo Grande, 1749-016 Lisboa, Portugal
- Department of Physics, University of Coimbra, 3004-516 Coimbra, Portugal
| | - Rita Delgado
- Instituto de Tecnologia
Química e Biológica António Xavier, Universidade Nova de Lisboa, Av. da República, 2780-157 Oeiras, Portugal
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37
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Lorion MM, Duarte FJS, Calhorda MJ, Oble J, Poli G. Opening the Way to Catalytic Aminopalladation/Proxicyclic Dehydropalladation: Access to Methylidene γ-Lactams. Org Lett 2016; 18:1020-3. [DOI: 10.1021/acs.orglett.6b00143] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Mélanie M. Lorion
- Sorbonne Universités, UPMC Univ Paris 06,
Institut Parisien de Chimie Moléculaire, UMR CNRS 8232, Case 229, 4 Place Jussieu, 75252 Paris Cedex 05, France
| | - Filipe J. S. Duarte
- Centro
de Química e Bioquímica, DQB, Faculdade de Ciências, Universidade de Lisboa, 1749-016 Lisboa, Portugal
| | - Maria José Calhorda
- Centro
de Química e Bioquímica, DQB, Faculdade de Ciências, Universidade de Lisboa, 1749-016 Lisboa, Portugal
| | - Julie Oble
- Sorbonne Universités, UPMC Univ Paris 06,
Institut Parisien de Chimie Moléculaire, UMR CNRS 8232, Case 229, 4 Place Jussieu, 75252 Paris Cedex 05, France
| | - Giovanni Poli
- Sorbonne Universités, UPMC Univ Paris 06,
Institut Parisien de Chimie Moléculaire, UMR CNRS 8232, Case 229, 4 Place Jussieu, 75252 Paris Cedex 05, France
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38
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Affiliation(s)
- Filipe J. S. Duarte
- Centro
de Quı́mica e Bioquı́mica, DQB, Faculdade
de Ciências, Universidade de Lisboa, 1749-016 Lisboa, Portugal
| | - Giovanni Poli
- Sorbonne Universités, UPMC Univ Paris 06,
Institut Parisien de Chimie Moléculaire, UMR CNRS 8232, Case
229, FR2769 Institut de Chimie Moléculaire, 4 place Jussieu, 75252 Paris Cedex 05, France
| | - Maria José Calhorda
- Centro
de Quı́mica e Bioquı́mica, DQB, Faculdade
de Ciências, Universidade de Lisboa, 1749-016 Lisboa, Portugal
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39
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Calabrese I, Turco Liveri ML, Ferreira MJ, Bento A, Vaz PD, Calhorda MJ, Nunes CD. Porous materials as delivery and protective agents for Vitamin A. RSC Adv 2016. [DOI: 10.1039/c6ra12026a] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
Vitamin A can be loaded in porous materials and released under conditions simulating the oral drug administration. Sepiolite, a clay, prevents oxidation of Vitamin A, and could be a good candidate for oral Vitamin A delivery systems.
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Affiliation(s)
- Ilaria Calabrese
- Centro de Química e Bioquímica
- DQB
- Faculdade de Ciências
- Universidade de Lisboa
- 1749-016 Lisboa
| | | | - Maria João Ferreira
- Centro de Química Estrutural
- Instituto Superior Técnico
- Universidade de Lisboa
- 1049-001 Lisboa
- Portugal
| | - Artur Bento
- Centro de Química e Bioquímica
- DQB
- Faculdade de Ciências
- Universidade de Lisboa
- 1749-016 Lisboa
| | - Pedro D. Vaz
- Centro de Química e Bioquímica
- DQB
- Faculdade de Ciências
- Universidade de Lisboa
- 1749-016 Lisboa
| | - Maria José Calhorda
- Centro de Química e Bioquímica
- DQB
- Faculdade de Ciências
- Universidade de Lisboa
- 1749-016 Lisboa
| | - Carla D. Nunes
- Centro de Química e Bioquímica
- DQB
- Faculdade de Ciências
- Universidade de Lisboa
- 1749-016 Lisboa
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40
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Suresh D, Ferreira B, Lopes PS, Gomes CSB, Krishnamoorthy P, Charas A, Vila-Viçosa D, Morgado J, Calhorda MJ, Maçanita AL, Gomes PT. Boron complexes of aromatic ring fused iminopyrrolyl ligands: synthesis, structure, and luminescence properties. Dalton Trans 2016; 45:15603-15620. [DOI: 10.1039/c6dt02771g] [Citation(s) in RCA: 28] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
New fluorescent aromatic ring-fused 2-iminopyrrolyl diphenyl boron complexes are emitters in the range blue to orange.
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41
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Realista S, Ramgi P, Cardoso BDP, Melato AI, Viana AS, Calhorda MJ, Martinho PN. Heterodinuclear Ni(ii) and Cu(ii) Schiff base complexes and their activity in oxygen reduction. Dalton Trans 2016; 45:14725-33. [DOI: 10.1039/c6dt01903j] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/27/2022]
Abstract
New hetero- and homo-dinuclear Cu/Ni complexes electropolymerise potentiodynamically on glassy carbon electrodes and the polymers reduce dioxygen in water.
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Affiliation(s)
- Sara Realista
- Centro de Química e Bioquímica
- DQB
- Faculdade de Ciências
- Universidade de Lisboa
- 1749-016 Lisboa
| | - Priscila Ramgi
- Centro de Química e Bioquímica
- DQB
- Faculdade de Ciências
- Universidade de Lisboa
- 1749-016 Lisboa
| | - Bernardo de P. Cardoso
- Centro de Química e Bioquímica
- DQB
- Faculdade de Ciências
- Universidade de Lisboa
- 1749-016 Lisboa
| | - Ana I. Melato
- Centro de Química e Bioquímica
- DQB
- Faculdade de Ciências
- Universidade de Lisboa
- 1749-016 Lisboa
| | - Ana S. Viana
- Centro de Química e Bioquímica
- DQB
- Faculdade de Ciências
- Universidade de Lisboa
- 1749-016 Lisboa
| | - Maria José Calhorda
- Centro de Química e Bioquímica
- DQB
- Faculdade de Ciências
- Universidade de Lisboa
- 1749-016 Lisboa
| | - Paulo N. Martinho
- Centro de Química e Bioquímica
- DQB
- Faculdade de Ciências
- Universidade de Lisboa
- 1749-016 Lisboa
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42
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Nunes CD, Vaz PD, Félix V, Veiros LF, Moniz T, Rangel M, Realista S, Mourato AC, Calhorda MJ. Vanadyl cationic complexes as catalysts in olefin oxidation. Dalton Trans 2015; 44:5125-38. [PMID: 25675271 DOI: 10.1039/c4dt03174a] [Citation(s) in RCA: 43] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Three new mononuclear oxovanadium(IV) complexes [VO(acac)(R-BIAN)]Cl (BIAN = 1,2-bis{(R-phenyl)imino}acenaphthene, R = H, 1; CH3, 2; Cl, 3) were prepared and characterized. They promoted the catalytic oxidation of olefins such as cyclohexene, cis-cyclooctene, and styrene with both tbhp (tert-butylhydroperoxide) and H2O2, and of enantiopure olefins (S(-)- and R(+)-pinene, and S(-)- and R(+)-limonene) selectively to their epoxides, with tbhp as the oxidant. The TOFs for styrene epoxidation promoted by complex 3 with H2O2 (290 mol mol(-1)V h(-1)) and for cis-cyclooctene epoxidation by 2 with tbhp (248 mol mol(-1)V h(-1)) are particularly good. Conversions reached 90% for several systems with tbhp, and were lower with H2O2. A preference for the internal C=C bond, rather than the terminal one, was found for limonene. Kinetic data indicate an associative process as the first step of the reaction and complex [VO(acac)(H-BIAN)](+) (1(+)) was isolated in an FTICR cell after adding tbhp to 1. EPR studies provide evidence for the presence of a V(IV) species in solution, until at least 48 hours after the addition of tbhp and cis-cyclooctene, and cyclic voltammetry studies revealed an oxidation potential above 1 V for complex 1. DFT calculations suggest that a [VO(H-BIAN)(MeOO)](+) complex is the likely active V(IV) species in the catalytic cycle from which two competitive mechanisms for the reaction proceed, an outer sphere path with an external attack of the olefin at the coordinated peroxide, and an inner sphere mechanism starting with a complex with the olefin coordinated to vanadium.
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Affiliation(s)
- Carla D Nunes
- Centro de Química e Bioquímica, DQB, Faculdade de Ciências, Universidade de Lisboa, 1749-016 Lisboa, Portugal.
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43
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Cachatra V, Almeida A, Sardinha J, Lucas SD, Gomes A, Vaz PD, Florêncio MH, Nunes R, Vila-Viçosa D, Calhorda MJ, Rauter AP. Wittig Reaction: Domino Olefination and Stereoselectivity DFT Study. Synthesis of the Miharamycins’ Bicyclic Sugar Moiety. Org Lett 2015; 17:5622-5. [DOI: 10.1021/acs.orglett.5b02849] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Vasco Cachatra
- Centro de Química
e Bioquímica, Departamento de Química e Bioquímica,
Faculdade de Ciências, Universidade de Lisboa, Ed. C8, Piso
5, Campo Grande, 1749-016 Lisboa, Portugal
| | - Andreia Almeida
- Centro de Química
e Bioquímica, Departamento de Química e Bioquímica,
Faculdade de Ciências, Universidade de Lisboa, Ed. C8, Piso
5, Campo Grande, 1749-016 Lisboa, Portugal
| | - João Sardinha
- Centro de Química
e Bioquímica, Departamento de Química e Bioquímica,
Faculdade de Ciências, Universidade de Lisboa, Ed. C8, Piso
5, Campo Grande, 1749-016 Lisboa, Portugal
| | - Susana D. Lucas
- Centro de Química
e Bioquímica, Departamento de Química e Bioquímica,
Faculdade de Ciências, Universidade de Lisboa, Ed. C8, Piso
5, Campo Grande, 1749-016 Lisboa, Portugal
| | - Ana Gomes
- Centro de Química
e Bioquímica, Departamento de Química e Bioquímica,
Faculdade de Ciências, Universidade de Lisboa, Ed. C8, Piso
5, Campo Grande, 1749-016 Lisboa, Portugal
| | - Pedro D. Vaz
- Centro de Química
e Bioquímica, Departamento de Química e Bioquímica,
Faculdade de Ciências, Universidade de Lisboa, Ed. C8, Piso
5, Campo Grande, 1749-016 Lisboa, Portugal
| | - M. Helena Florêncio
- Centro de Química
e Bioquímica, Departamento de Química e Bioquímica,
Faculdade de Ciências, Universidade de Lisboa, Ed. C8, Piso
5, Campo Grande, 1749-016 Lisboa, Portugal
| | - Rafael Nunes
- Centro de Química
e Bioquímica, Departamento de Química e Bioquímica,
Faculdade de Ciências, Universidade de Lisboa, Ed. C8, Piso
5, Campo Grande, 1749-016 Lisboa, Portugal
| | - Diogo Vila-Viçosa
- Centro de Química
e Bioquímica, Departamento de Química e Bioquímica,
Faculdade de Ciências, Universidade de Lisboa, Ed. C8, Piso
5, Campo Grande, 1749-016 Lisboa, Portugal
| | - Maria José Calhorda
- Centro de Química
e Bioquímica, Departamento de Química e Bioquímica,
Faculdade de Ciências, Universidade de Lisboa, Ed. C8, Piso
5, Campo Grande, 1749-016 Lisboa, Portugal
| | - Amélia P. Rauter
- Centro de Química
e Bioquímica, Departamento de Química e Bioquímica,
Faculdade de Ciências, Universidade de Lisboa, Ed. C8, Piso
5, Campo Grande, 1749-016 Lisboa, Portugal
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44
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45
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Holzhacker C, Stöger B, Carvalho MD, Ferreira LP, Pittenauer E, Allmaier G, Veiros LF, Realista S, Gil A, Calhorda MJ, Müller D, Kirchner K. Synthesis and reactivity of TADDOL-based chiral Fe(II) PNP pincer complexes-solution equilibria between κ(2)P,N- and κ(3)P,N,P-bound PNP pincer ligands. Dalton Trans 2015; 44:13071-86. [PMID: 26104487 DOI: 10.1039/c5dt00832h] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/14/2023]
Abstract
Treatment of anhydrous FeX2 (X = Cl, Br) with 1 equiv. of the asymmetric chiral PNP pincer ligands PNP-R,TAD (R = iPr, tBu) with an R,R-TADDOL (TAD) moiety afforded complexes of the general formula [Fe(PNP)X2]. In the solid state these complexes adopt a tetrahedral geometry with the PNP ligand coordinated in κ(2)P,N-fashion, as shown by X-ray crystallography and Mössbauer spectroscopy. Magnetization studies led to a magnetic moment very close to 4.9μB reflecting the expected four unpaired d-electrons (quintet ground state). In solution there are equilibria between [Fe(κ(3)P,N,P-PNP-R,TAD)X2] and [Fe(κ(2)P,N-PNP-R,TAD)X2] complexes, i.e., the PNP-R,TAD ligand is hemilabile. At -50 °C these equilibria are slow and signals of the non-coordinated P-TAD arm of the κ(2)P,N-PNP-R,TAD ligand can be detected by (31)P{(1)H} NMR spectroscopy. Addition of BH3 to a solution of [Fe(PNP-iPr,TAD)Cl2] leads to selective boronation of the pendant P-TAD arm shifting the equilibrium towards the four-coordinate complex [Fe(κ(2)P,N-PNP-iPr,TAD(BH3))Cl2]. DFT calculations corroborate the existence of equilibria between four- and five-coordinated complexes. Addition of CO to [Fe(PNP-iPr,TAD)X2] in solution yields the diamagnetic octahedral complexes trans-[Fe(κ(3)P,N,P-PNP-iPr,TAD)(CO)X2], which react further with Ag(+) salts in the presence of CO to give the cationic complexes trans-[Fe(κ(3)P,N,P-PNP-iPr,TAD)(CO)2X](+). CO addition most likely takes place at the five coordinate complex [Fe(κ(3)P,N,P-PNP-iPr,TAD)X2]. The mechanism for the CO addition was also investigated by DFT and the most favorable path obtained corresponds to the rearrangement of the pincer ligand first from a κ(2)P,N- to a κ(3)P,N,P-coordination mode followed by CO coordination to [Fe(κ(3)P,N,P-PNP-iPr,TAD)X2]. Complexes bearing tBu substituents do not react with CO. Moreover, in the solid state none of the tetrahedral complexes are able to bind CO.
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Affiliation(s)
- Christian Holzhacker
- Institute of Applied Synthetic Chemistry, Vienna University of Technology, Getreidemarkt 9, A-1060 Vienna, Austria.
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46
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Gil A, Melle-Franco M, Branchadell V, Calhorda MJ. How the Intercalation of Phenanthroline Affects the Structure, Energetics, and Bond Properties of DNA Base Pairs: Theoretical Study Applied to Adenine–Thymine and Guanine–Cytosine Tetramers. J Chem Theory Comput 2015; 11:2714-28. [DOI: 10.1021/ct5006104] [Citation(s) in RCA: 26] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022]
Affiliation(s)
- Adrià Gil
- Centro
de Química e Bioquímica, DQB, Faculdade de Ciências, Universidade de Lisboa, Campo Grande, 1749-016 Lisboa, Portugal
| | | | - Vicenç Branchadell
- Departament
de Química, Universitat Autònoma de Barcelona, 08193 Bellaterra, Barcelona, Spain
| | - Maria José Calhorda
- Centro
de Química e Bioquímica, DQB, Faculdade de Ciências, Universidade de Lisboa, Campo Grande, 1749-016 Lisboa, Portugal
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47
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Barroso S, Coelho AM, Gómez-Ruiz S, Calhorda MJ, Žižak Ž, Kaluđerović GN, Martins AM. Correction: Synthesis, cytotoxic and hydrolytic studies of titanium complexes anchored by a tripodal diamine bis(phenolate) ligand. Dalton Trans 2015; 44:2497. [PMID: 25526919 DOI: 10.1039/c4dt90194k] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Correction for 'Synthesis, cytotoxic and hydrolytic studies of titanium complexes anchored by a tripodal diamine bis(phenolate) ligand' by Sónia Barroso et al., Dalton Trans., 2014, 43, 17422-17433.
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Affiliation(s)
- Sónia Barroso
- Centro de Química Estrutural, Instituto Superior Técnico, Universidade de Lisboa, Av. Rovisco Pais, 1049-001 Lisboa, Portugal.
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48
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Suresh D, Gomes CSB, Lopes PS, Figueira CA, Ferreira B, Gomes PT, Di Paolo RE, Maçanita AL, Duarte MT, Charas A, Morgado J, Vila-Viçosa D, Calhorda MJ. Luminescent Di- and Trinuclear Boron Complexes Based on Aromatic Iminopyrrolyl Spacer Ligands: Synthesis, Characterization, and Application in OLEDs. Chemistry 2015; 21:9133-49. [DOI: 10.1002/chem.201500109] [Citation(s) in RCA: 40] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/11/2015] [Indexed: 11/05/2022]
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49
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Vasconcellos Dias M, Saraiva MS, Ferreira P, Calhorda MJ. Catalytic Activity of Molybdenum(II) Complexes in Homogeneous and Heterogeneous Conditions. Organometallics 2015. [DOI: 10.1021/om501068q] [Citation(s) in RCA: 19] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Maria Vasconcellos Dias
- Departamento
de Química e Bioquímica, CQB, Faculdade de Ciências, Universidade de Lisboa, Campo Grande, 1749-016 Lisboa, Portugal
| | - Marta S. Saraiva
- Departamento
de Química e Bioquímica, CQB, Faculdade de Ciências, Universidade de Lisboa, Campo Grande, 1749-016 Lisboa, Portugal
| | - Paula Ferreira
- CICECO - Aveiro
Institute of Materials, Department of Materials and Ceramic Engineering, University of Aveiro, 3810-193 Aveiro, Portugal
| | - Maria José Calhorda
- Departamento
de Química e Bioquímica, CQB, Faculdade de Ciências, Universidade de Lisboa, Campo Grande, 1749-016 Lisboa, Portugal
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50
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Realista S, Viana AS, Cardoso BDP, Botelho do Rego AM, Vaz PD, Melato AI, Martinho PN, Calhorda MJ. Asymmetric binuclear Ni(ii) and Cu(ii) Schiff base metallopolymers. RSC Adv 2015. [DOI: 10.1039/c5ra03560k] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
We use electrochemistry to polymerise the new asymmetric binuclear Cu(ii)/Cu(ii) and Ni(ii)/Ni(ii) monomers and study their behaviour as modified electrodes.
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Affiliation(s)
- Sara Realista
- Centro de Química e Bioquímica
- DQB
- Faculdade de Ciências
- Universidade de Lisboa
- 1749-016 Lisboa
| | - Ana S. Viana
- Centro de Química e Bioquímica
- DQB
- Faculdade de Ciências
- Universidade de Lisboa
- 1749-016 Lisboa
| | - Bernardo de P. Cardoso
- Centro de Química e Bioquímica
- DQB
- Faculdade de Ciências
- Universidade de Lisboa
- 1749-016 Lisboa
| | - Ana M. Botelho do Rego
- Centro de Química-Física Molecular (CQFM)
- Institute of Nanoscience and Nanotechnology (IN)
- Instituto Superior Técnico
- Universidade de Lisboa
- 1049-001 Lisboa
| | - Pedro D. Vaz
- Centro de Química e Bioquímica
- DQB
- Faculdade de Ciências
- Universidade de Lisboa
- 1749-016 Lisboa
| | - Ana I. Melato
- Centro de Química e Bioquímica
- DQB
- Faculdade de Ciências
- Universidade de Lisboa
- 1749-016 Lisboa
| | - Paulo N. Martinho
- Centro de Química e Bioquímica
- DQB
- Faculdade de Ciências
- Universidade de Lisboa
- 1749-016 Lisboa
| | - Maria José Calhorda
- Centro de Química e Bioquímica
- DQB
- Faculdade de Ciências
- Universidade de Lisboa
- 1749-016 Lisboa
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