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Campaniço A, Harjivan SG, Freitas E, Serafini M, Gaspar MM, Capela R, Gomes P, Jordaan A, Madureira AM, André V, Silva AB, Duarte MT, Portugal I, Perdigão J, Moreira R, Warner DF, Lopes F. Structural Optimization of Antimycobacterial Azaaurones Towards Improved Solubility and Metabolic Stability. ChemMedChem 2023; 18:e202300410. [PMID: 37845182 DOI: 10.1002/cmdc.202300410] [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] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/02/2023] [Revised: 10/09/2023] [Accepted: 10/16/2023] [Indexed: 10/18/2023]
Abstract
While N-acetyl azaaurones have already been disclosed for their potential against tuberculosis (TB), their low metabolic stability remains an unaddressed liability. We now report a study designed to improve the metabolic stability and solubility of the azaaurone scaffold and to identify the structural requirements for antimycobacterial activity. Replacing the N-acetyl moiety for a N-carbamoyl group led to analogues with sub- and nanomolar potencies against M. tuberculosis H37Rv, as well as equipotent against drug-susceptible and drug-resistant M. tuberculosis isolates. The new N-carbamoyl azaaurones exhibited improved microsomal stability, compared to their N-acetylated counterparts, with several compounds displaying moderate to high kinetic solubility. The frequency of spontaneous resistance to azaaurones was observed to be in the range of 10-8 , a value that is comparable to current TB drugs in the market. Overall, these results reveal that azaaurones are amenable to structural modifications to improve metabolic and solubility liabilities, and highlight their potential as antimycobacterial agents.
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Affiliation(s)
- André Campaniço
- Instituto de Investigação do Medicamento (iMed.ULisboa), Faculdade de Farmácia, Universidade de Lisboa, Av. Prof. Gama Pinto, 1649-003, Lisboa, Portugal
| | - Shrika G Harjivan
- Instituto de Investigação do Medicamento (iMed.ULisboa), Faculdade de Farmácia, Universidade de Lisboa, Av. Prof. Gama Pinto, 1649-003, Lisboa, Portugal
| | - Elisabete Freitas
- Instituto de Investigação do Medicamento (iMed.ULisboa), Faculdade de Farmácia, Universidade de Lisboa, Av. Prof. Gama Pinto, 1649-003, Lisboa, Portugal
| | - Marco Serafini
- Instituto de Investigação do Medicamento (iMed.ULisboa), Faculdade de Farmácia, Universidade de Lisboa, Av. Prof. Gama Pinto, 1649-003, Lisboa, Portugal
| | - M Manuela Gaspar
- Instituto de Investigação do Medicamento (iMed.ULisboa), Faculdade de Farmácia, Universidade de Lisboa, Av. Prof. Gama Pinto, 1649-003, Lisboa, Portugal
| | - Rita Capela
- Instituto de Investigação do Medicamento (iMed.ULisboa), Faculdade de Farmácia, Universidade de Lisboa, Av. Prof. Gama Pinto, 1649-003, Lisboa, Portugal
| | - Pedro Gomes
- Instituto de Investigação do Medicamento (iMed.ULisboa), Faculdade de Farmácia, Universidade de Lisboa, Av. Prof. Gama Pinto, 1649-003, Lisboa, Portugal
| | - Audrey Jordaan
- Molecular Mycobacteriology Research Unit, Department of Pathology and Institute of Infectious Disease and Molecular Medicine, Faculty of Health Sciences, University of Cape Town, Cape Town, Rondebosch, 7701, South Africa
| | - Ana M Madureira
- Instituto de Investigação do Medicamento (iMed.ULisboa), Faculdade de Farmácia, Universidade de Lisboa, Av. Prof. Gama Pinto, 1649-003, Lisboa, Portugal
| | - Vânia André
- Centro de Química Estrutural, Institute of Molecular Sciences, Instituto Superior Técnico, Universidade de Lisboa, Av. Rovisco Pais 1, 1049-001, Lisboa, Portugal
- Associação do Instituto Superior Técnico para a Investigação e Desenvolvimento (IST-ID), Avenida António José de Almeida, n.° 12, 1000-043, Lisboa, Portugal
| | - Andreia B Silva
- Faculdade de Farmácia, Universidade de Lisboa, Av. Prof. Gama Pinto, 1649-003, Lisboa, Portugal
| | - M Teresa Duarte
- Centro de Química Estrutural, Institute of Molecular Sciences, Instituto Superior Técnico, Universidade de Lisboa, Av. Rovisco Pais 1, 1049-001, Lisboa, Portugal
| | - Isabel Portugal
- Instituto de Investigação do Medicamento (iMed.ULisboa), Faculdade de Farmácia, Universidade de Lisboa, Av. Prof. Gama Pinto, 1649-003, Lisboa, Portugal
| | - João Perdigão
- Instituto de Investigação do Medicamento (iMed.ULisboa), Faculdade de Farmácia, Universidade de Lisboa, Av. Prof. Gama Pinto, 1649-003, Lisboa, Portugal
| | - Rui Moreira
- Instituto de Investigação do Medicamento (iMed.ULisboa), Faculdade de Farmácia, Universidade de Lisboa, Av. Prof. Gama Pinto, 1649-003, Lisboa, Portugal
| | - Digby F Warner
- Molecular Mycobacteriology Research Unit, Department of Pathology and Institute of Infectious Disease and Molecular Medicine, Faculty of Health Sciences, University of Cape Town, Cape Town, Rondebosch, 7701, South Africa
- Wellcome Centre for Infectious Diseases Research in Africa, University of Cape Town, Cape Town, Rondebosch, 7701, South Africa
| | - Francisca Lopes
- Instituto de Investigação do Medicamento (iMed.ULisboa), Faculdade de Farmácia, Universidade de Lisboa, Av. Prof. Gama Pinto, 1649-003, Lisboa, Portugal
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André V, Duarte MT, Gomes CSB, Sarraguça MC. Mechanochemistry in Portugal-A Step towards Sustainable Chemical Synthesis. Molecules 2021; 27:241. [PMID: 35011471 PMCID: PMC8746420 DOI: 10.3390/molecules27010241] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [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: 11/05/2021] [Revised: 12/21/2021] [Accepted: 12/22/2021] [Indexed: 11/17/2022] Open
Abstract
In Portugal, publications with mechanochemical methods date back to 2009, with the report on mechanochemical strategies for the synthesis of metallopharmaceuticals. Since then, mechanochemical applications have grown in Portugal, spanning several fields, mainly crystal engineering and supramolecular chemistry, catalysis, and organic and inorganic chemistry. The area with the most increased development is the synthesis of multicomponent crystal forms, with several groups synthesizing solvates, salts, and cocrystals in which the main objective was to improve physical properties of the active pharmaceutical ingredients. Recently, non-crystalline materials, such as ionic liquids and amorphous solid dispersions, have also been studied using mechanochemical methods. An area that is in expansion is the use of mechanochemical synthesis of bioinspired metal-organic frameworks with an emphasis in antibiotic coordination frameworks. The use of mechanochemistry for catalysis and organic and inorganic synthesis has also grown due to the synthetic advantages, ease of synthesis, scalability, sustainability, and, in the majority of cases, the superior properties of the synthesized materials. It can be easily concluded that mechanochemistry is expanding in Portugal in diverse research areas.
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Affiliation(s)
- Vânia André
- Centro de Química Estrutural, Instituto Superior Técnico, Universidade de Lisboa, Av. Rovisco Pais 1, 1049-001 Lisbon, Portugal
- Associação do Instituto Superior Técnico para a Investigação e Desenvolvimento (IST-ID), Av. Rovisco Pais 1, 1049-003 Lisbon, Portugal
| | - M. Teresa Duarte
- Centro de Química Estrutural, Instituto Superior Técnico, Universidade de Lisboa, Av. Rovisco Pais 1, 1049-001 Lisbon, Portugal
| | - Clara S. B. Gomes
- LAQV-REQUIMTE, Departamento de Química, NOVA School of Science and Technology, 2829-516 Caparica, Portugal
- Associate Laboratory i4HB—Institute for Health and Bioeconomy, School of Science and Technology, NOVA University Lisbon, 2819-516 Caparica, Portugal
- UCIBIO—Applied Molecular Biosciences Unit, Department of Chemistry, School of Science and Technology, NOVA University Lisbon, 2819-516 Caparica, Portugal
| | - Mafalda C. Sarraguça
- LAQV-REQUIMTE, Departamento de Ciências Químicas, Faculdade de Farmácia, Universidade do Porto, Rua Jorge Viterbo Ferreira, 228, 4050-313 Porto, Portugal
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Teixeira FC, Antunes IF, Curto MJM, Duarte MT, André V, Teixeira APS. New C‐3 Substituted 1
H
‐ and 2
H
‐Indazolephosphonic Acid Regioisomers: Synthesis, Spectroscopic Characterization and X‐Ray Diffraction Studies. ChemistrySelect 2021. [DOI: 10.1002/slct.202102538] [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)
- Fátima C. Teixeira
- Laboratório Nacional de Energia e Geologia, I.P. Estrada do Paço do Lumiar, 22 1649-038 Lisboa Portugal
| | - Inês F. Antunes
- Laboratório Nacional de Energia e Geologia, I.P. Estrada do Paço do Lumiar, 22 1649-038 Lisboa Portugal
| | - M. João M. Curto
- Laboratório Nacional de Energia e Geologia, I.P. Estrada do Paço do Lumiar, 22 1649-038 Lisboa Portugal
| | - M. Teresa Duarte
- Centro de Química Estrutural Instituto Superior Técnico Universidade de Lisboa Av. Rovisco Pais 1049-001 Lisboa Portugal
| | - Vânia André
- Centro de Química Estrutural Instituto Superior Técnico Universidade de Lisboa Av. Rovisco Pais 1049-001 Lisboa Portugal
- Associação do Instituto Superior Técnico para a Investigação e Desenvolvimento (IST-ID) Av. Rovisco Pais 1049-003 Lisboa Portugal
| | - António P. S. Teixeira
- Departamento de Ciências Médicas e da Saúde, Escola de Saúde e Desenvolvimento Humano & LAQV- REQUIMTE, IIFA Universidade de Évora R. Romão Ramalho, 59 7000-671 Évora Portugal
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Quaresma S, Alves PC, Rijo P, Duarte MT, André V. Antimicrobial Activity of Pyrazinamide Coordination Frameworks Synthesized by Mechanochemistry. Molecules 2021; 26:1904. [PMID: 33800635 PMCID: PMC8036749 DOI: 10.3390/molecules26071904] [Citation(s) in RCA: 7] [Impact Index Per Article: 2.3] [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: 02/16/2021] [Revised: 03/21/2021] [Accepted: 03/25/2021] [Indexed: 11/16/2022] Open
Abstract
The urge for the development of a more efficient antibiotic crystalline forms led us to the disclosure of new antibiotic coordination frameworks of pyrazinamide, a well-known drug used for the treatment of tuberculosis, with some of the novel compounds unravelling improved antimycobacterial activity. Mechanochemistry was the preferred synthetic technique to yield novel compounds, allowing the reproduction of a 1D zinc framework, the synthesis of a novel hydrogen bonding manganese framework, and three new compounds with silver. The structural characterization of the novel forms is presented along with stability studies. The increased antimicrobial activity of the new silver-based frameworks against Escherichia coli, Staphylococcus aureus, and Mycobacterium smegmatis is particularly relevant.
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Affiliation(s)
- Sílvia Quaresma
- Centro de Química Estrutural, Instituto Superior Técnico, Universidade de Lisboa, Av. Rovisco Pais, 1049-001 Lisboa, Portugal; (S.Q.); (P.C.A.)
| | - Paula C. Alves
- Centro de Química Estrutural, Instituto Superior Técnico, Universidade de Lisboa, Av. Rovisco Pais, 1049-001 Lisboa, Portugal; (S.Q.); (P.C.A.)
- Associação do Instituto Superior Técnico para a Investigação e Desenvolvimento (IST-ID), Av. Rovisco Pais, 1049-003 Lisboa, Portugal
| | - Patrícia Rijo
- Centro de Investigação em Biociências e Tecnologias da Saúde (CBIOS), Universidade Lusófona de Humanidades e Tecnologias, Campo Grande 376, 1749-024 Lisboa, Portugal;
- Research Institute for Medicines (iMed. ULisboa), Faculty of Pharmacy, Universidade de Lisboa (UL), Av. Prof. Gama Pinto, 1649-003 Lisboa, Portugal
| | - M. Teresa Duarte
- Centro de Química Estrutural, Instituto Superior Técnico, Universidade de Lisboa, Av. Rovisco Pais, 1049-001 Lisboa, Portugal; (S.Q.); (P.C.A.)
- Departamento de Engenharia Química, Instituto Superior Técnico, Universidade de Lisboa, Av. Rovisco Pais, 1049-001 Lisboa, Portugal
| | - Vânia André
- Centro de Química Estrutural, Instituto Superior Técnico, Universidade de Lisboa, Av. Rovisco Pais, 1049-001 Lisboa, Portugal; (S.Q.); (P.C.A.)
- Associação do Instituto Superior Técnico para a Investigação e Desenvolvimento (IST-ID), Av. Rovisco Pais, 1049-003 Lisboa, Portugal
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Teixeira FC, Lucas C, Curto MJM, André V, Duarte MT, Teixeira APS. Synthesis of novel pyrazolo[3,4-b]quinolinebisphosphonic acids and an unexpected intramolecular cyclization and phosphonylation reaction. Org Biomol Chem 2021; 19:2533-2545. [PMID: 33666215 DOI: 10.1039/d1ob00025j] [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] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Novel pyrazolo[3,4-b]quinoline α-ketophosphonic and hydroxymethylenebisphosphonic acid compounds were synthesized using different methodologies, starting from 2-chloro-3-formylquinoline 1. New phosphonic acid compounds were obtained as N-1 derivatives with a side chain with 1 or 3 (n = 1 or 3) methylene groups. All phosphonic acid compounds and their corresponding ester and carboxylic acid precursors were fully characterized, and their structures elucidated by spectroscopic data, using NMR techniques and infrared and high-resolution mass spectroscopy. During the process to obtain the N-1 substituted derivative with two methylene groups (n = 2) in the side chain, an unexpected addition-cyclization cascade reaction was observed, involving the phosphonylation of an aromatic ring and the formation of a new six-member lactam ring to afford a tetracyclic ring system. This was an unexpected result since other pyrazolo[3,4-b]quinoline derivatives and all corresponding pyrazolo[3,4-b]pyridine derivatives already prepared, under similar experimental conditions, did not undergo this reaction. This domino reaction occurs with different phosphite reagents but only affords the six-member ring. The spectroscopic data allowed the identification of the new synthesized tetracyclic compounds and the X-ray diffraction data of compound 11 enabled the confirmation of the proposed structures.
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Affiliation(s)
- Fátima C Teixeira
- Laboratório Nacional de Energia e Geologia, I.P., Estrada do Paço do Lumiar, 22, 1649-038 Lisboa, Portugal.
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da Silva JLF, da Piedade MFM, André V, Domingos S, Martins ICB, Duarte MT. Addendum: da Silva, J.L.F.; et al. The Lisbon Supramolecular Green Story: Mechanochemistry towards New Forms of Pharmaceuticals. Molecules 2020, 25, 2705. Molecules 2021. [PMCID: PMC7830594 DOI: 10.3390/molecules26020419] [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] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022] Open
Affiliation(s)
- João Luís Ferreira da Silva
- Centro de Química Estrutural, Instituto Superior Técnico, Universidade de Lisboa, Avenida Rovisco Pais, 1049-001 Lisboa, Portugal; (J.L.F.d.S.); (M.F.M.d.P.); (V.A.); (S.D.); (I.C.B.M.)
- Departamento de Engenharia Química, Instituto Superior Técnico, Universidade de Lisboa, Avenida Rovisco Pais, 1049-001 Lisboa, Portugal
| | - M. Fátima Minas da Piedade
- Centro de Química Estrutural, Instituto Superior Técnico, Universidade de Lisboa, Avenida Rovisco Pais, 1049-001 Lisboa, Portugal; (J.L.F.d.S.); (M.F.M.d.P.); (V.A.); (S.D.); (I.C.B.M.)
- Departamento de Química e Bioquímica, Faculdade de Ciencias, Universidade de Lisboa, 1649-016 Lisboa, Portugal
| | - Vânia André
- Centro de Química Estrutural, Instituto Superior Técnico, Universidade de Lisboa, Avenida Rovisco Pais, 1049-001 Lisboa, Portugal; (J.L.F.d.S.); (M.F.M.d.P.); (V.A.); (S.D.); (I.C.B.M.)
- Associação do Instituto Superior Técnico para a Investigação e Desenvolvimento (IST-ID), Av. Rovisco Pais, 1049-003 Lisboa, Portugal
| | - Sofia Domingos
- Centro de Química Estrutural, Instituto Superior Técnico, Universidade de Lisboa, Avenida Rovisco Pais, 1049-001 Lisboa, Portugal; (J.L.F.d.S.); (M.F.M.d.P.); (V.A.); (S.D.); (I.C.B.M.)
| | - Inês C. B. Martins
- Centro de Química Estrutural, Instituto Superior Técnico, Universidade de Lisboa, Avenida Rovisco Pais, 1049-001 Lisboa, Portugal; (J.L.F.d.S.); (M.F.M.d.P.); (V.A.); (S.D.); (I.C.B.M.)
| | - M. Teresa Duarte
- Centro de Química Estrutural, Instituto Superior Técnico, Universidade de Lisboa, Avenida Rovisco Pais, 1049-001 Lisboa, Portugal; (J.L.F.d.S.); (M.F.M.d.P.); (V.A.); (S.D.); (I.C.B.M.)
- Departamento de Engenharia Química, Instituto Superior Técnico, Universidade de Lisboa, Avenida Rovisco Pais, 1049-001 Lisboa, Portugal
- Correspondence:
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Zábranský M, Alves PC, Bravo C, Duarte MT, André V. From pipemidic acid molecular salts to metal complexes and BioMOFs using mechanochemistry. CrystEngComm 2021. [DOI: 10.1039/d0ce01533d] [Citation(s) in RCA: 3] [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: 12/11/2022]
Abstract
Mechanochemistry has proven to be an excellent sustainable, efficient and fast tool for the discovery of new crystal forms of old drugs.
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Affiliation(s)
- Martin Zábranský
- Centro de Química Estrutural, Instituto Superior Técnico, Universidade de Lisboa, Av. Rovisco Pais, 1049-001 Lisboa, Portugal
- Department of Inorganic Chemistry, Faculty of Science, Charles University, Hlavova 2030, 128 40 Prague, Czech Republic
| | - Paula C. Alves
- Centro de Química Estrutural, Instituto Superior Técnico, Universidade de Lisboa, Av. Rovisco Pais, 1049-001 Lisboa, Portugal
- Associação do Instituto Superior Técnico para a Investigação e Desenvolvimento (IST-ID), Av. Rovisco Pais, 1049-003 Lisboa, Portugal
| | - Catarina Bravo
- Centro de Química Estrutural, Instituto Superior Técnico, Universidade de Lisboa, Av. Rovisco Pais, 1049-001 Lisboa, Portugal
- Associação do Instituto Superior Técnico para a Investigação e Desenvolvimento (IST-ID), Av. Rovisco Pais, 1049-003 Lisboa, Portugal
| | - M. Teresa Duarte
- 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
| | - Vânia André
- Centro de Química Estrutural, Instituto Superior Técnico, Universidade de Lisboa, Av. Rovisco Pais, 1049-001 Lisboa, Portugal
- Associação do Instituto Superior Técnico para a Investigação e Desenvolvimento (IST-ID), Av. Rovisco Pais, 1049-003 Lisboa, Portugal
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Mónico A, Ramalhete C, André V, Spengler G, Mulhovo S, Duarte MT, Ferreira MJU. Cucurbalsaminones A-C, Rearranged Triterpenoids with a 5/6/3/6/5-Fused Pentacyclic Carbon Skeleton from Momordica balsamina, as Multidrug Resistance Reversers. J Nat Prod 2019; 82:2138-2143. [PMID: 31339732 DOI: 10.1021/acs.jnatprod.9b00019] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/10/2023]
Abstract
Three new triterpenoids, cucurbalsaminones A-C (1-3), featuring a unique 5/6/3/6/5-fused pentacyclic carbon skeleton, named cucurbalsaminane, were isolated from a methanol extract of Momordica balsamina. Their structures were elucidated by spectroscopic methods and corroborated, for 1, by structure solution using single-crystal X-ray diffraction analysis. A hypothetical biogenetic pathway for these compounds is proposed. Compounds 1-3 were evaluated for their P-glycoprotein (P-gp/ABCB1) modulation ability, using a mouse T-lymphoma MDR1-transfected cell model by the rhodamine-123 accumulation assay, and displayed potent multidrug resistance (MDR)-reversing activity.
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Affiliation(s)
- Andreia Mónico
- Research Institute for Medicines (iMed.ULisboa), Faculty of Pharmacy , Universidade de Lisboa , Avenida Prof. Gama Pinto , 1649-003 Lisbon , Portugal
| | - Cátia Ramalhete
- Research Institute for Medicines (iMed.ULisboa), Faculty of Pharmacy , Universidade de Lisboa , Avenida Prof. Gama Pinto , 1649-003 Lisbon , Portugal
- ATLÂNTICA - Escola Universitária de Ciências Empresariais, Saúde, Tecnologias e Engenharia , Fábrica da Pólvora de Barcarena, 2730-036 Barcarena, Oeiras , Portugal
| | - Vânia André
- Centro de Química Estrutural , Instituto Superior Técnico, Universidade de Lisboa , Avenida Rovisco Pais , 1049-001 Lisbon , Portugal
| | - Gabriella Spengler
- Department of Medical Microbiology and Immunobiology, Faculty of Medicine , University of Szeged , Dóm tér 10 , H-6720 Szeged , Hungary
| | - Silva Mulhovo
- Centro de Estudos Moçambicanos e de Etnociências, Faculdade de Ciências e Matemática , Universidade Pedagógica , 21402161 Maputo , Mozambique
| | - M Teresa Duarte
- Centro de Química Estrutural , Instituto Superior Técnico, Universidade de Lisboa , Avenida Rovisco Pais , 1049-001 Lisbon , Portugal
| | - Maria-José U Ferreira
- Research Institute for Medicines (iMed.ULisboa), Faculty of Pharmacy , Universidade de Lisboa , Avenida Prof. Gama Pinto , 1649-003 Lisbon , Portugal
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André V, da Silva ARF, Fernandes A, Frade R, Garcia C, Rijo P, Antunes AMM, Rocha J, Duarte MT. Mg- and Mn-MOFs Boost the Antibiotic Activity of Nalidixic Acid. ACS Appl Bio Mater 2019; 2:2347-2354. [DOI: 10.1021/acsabm.9b00046] [Citation(s) in RCA: 22] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/25/2023]
Affiliation(s)
- Vânia André
- Centro de Química Estrutural, Instituto Superior Técnico, Universidade de Lisboa, Av. Rovisco Pais, Lisbon 1049-001, Portugal
| | - André Ramires Ferreira da Silva
- Centro de Química Estrutural, Instituto Superior Técnico, Universidade de Lisboa, Av. Rovisco Pais, Lisbon 1049-001, Portugal
| | - Auguste Fernandes
- Centro de Química Estrutural, Instituto Superior Técnico, Universidade de Lisboa, Av. Rovisco Pais, Lisbon 1049-001, Portugal
| | - Raquel Frade
- Instituto de Investigação do Medicamento (iMed.ULisboa), Faculdade de Farmácia, Universidade de Lisboa, Lisbon 1649-003, Portugal
| | - Catarina Garcia
- Centre Research for Biosciences & Health Technologies (CBIOS), Universidade Lusófona de Humanidades e Tecnologias, Lisbon 1749-024, Portugal
| | - Patrícia Rijo
- Instituto de Investigação do Medicamento (iMed.ULisboa), Faculdade de Farmácia, Universidade de Lisboa, Lisbon 1649-003, Portugal
- Centre Research for Biosciences & Health Technologies (CBIOS), Universidade Lusófona de Humanidades e Tecnologias, Lisbon 1749-024, Portugal
| | - Alexandra M. M. Antunes
- Centro de Química Estrutural, Instituto Superior Técnico, Universidade de Lisboa, Av. Rovisco Pais, Lisbon 1049-001, Portugal
| | - João Rocha
- University of Aveiro, Department of Chemistry, CICECO-Aveiro Institute of Materials, Aveiro 3810-193, Portugal
| | - M. Teresa Duarte
- Centro de Química Estrutural, Instituto Superior Técnico, Universidade de Lisboa, Av. Rovisco Pais, Lisbon 1049-001, Portugal
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Martins ICB, Sardo M, Čendak T, Gomes JRB, Rocha J, Duarte MT, Mafra L. Hydrogen bonding networks in gabapentin protic pharmaceutical salts: NMR and in silico studies. Magn Reson Chem 2019; 57:243-255. [PMID: 30475406 DOI: 10.1002/mrc.4809] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/19/2018] [Revised: 11/16/2018] [Accepted: 11/20/2018] [Indexed: 06/09/2023]
Abstract
Hydrogen bonds (HBs) play a key role in the supramolecular arrangement of crystalline solids and, although they have been extensively studied, the influence of their strength and geometry on crystal packing remains poorly understood. Here we describe the crystal structures of two novel protic gabapentin (GBP) pharmaceutical salts prepared with the coformers methanesulfonic acid (GBP:METHA) and ethanesulfonic acid (GBP:ETHA). This study encompasses experimental and computational electronic structure analyses of 1 H NMR chemical shifts (CSs), upon in silico HB cleavage. GBP:METHA and GBP:ETHA crystal packing comprise two main structural domains: an ionic layer (characterized by the presence of charge-assisted + NHGBP ⋯O-METHA/ETHA HB interactions) and a neutral layer generated in a different way for each salt, mainly due to the presence of bifurcated HB interactions. A comprehensive study of HB networks is presented for GBP:METHA, by isolating molecular fragments involved in distinct HB types (NH⋯O, OH⋯O, and CH⋯O) obtained from in silico disassembling of an optimized three-dimensional packing structure. Formation of HB leads to calculated 1 H NMR CS changes from 0.4 to ~5.8 ppm. This study further attempts to assess how 1 H NMR CS of protons engaged in certain HB are affected when other nearby HB, involving bifurcated or geminal/vicinal hydrogen atoms, are removed.
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Affiliation(s)
- Inês C B Martins
- CQE - Centro de Química Estrutural, Instituto Superior Técnico, Universidade de Lisboa, Lisbon, Portugal
- CICECO - Aveiro Institute of Materials, Department of Chemistry, University of Aveiro, Aveiro, Portugal
| | - Mariana Sardo
- CICECO - Aveiro Institute of Materials, Department of Chemistry, University of Aveiro, Aveiro, Portugal
| | - Tomaž Čendak
- CICECO - Aveiro Institute of Materials, Department of Chemistry, University of Aveiro, Aveiro, Portugal
| | - José R B Gomes
- CICECO - Aveiro Institute of Materials, Department of Chemistry, University of Aveiro, Aveiro, Portugal
| | - João Rocha
- CICECO - Aveiro Institute of Materials, Department of Chemistry, University of Aveiro, Aveiro, Portugal
| | - M Teresa Duarte
- CQE - Centro de Química Estrutural, Instituto Superior Técnico, Universidade de Lisboa, Lisbon, Portugal
| | - Luís Mafra
- CICECO - Aveiro Institute of Materials, Department of Chemistry, University of Aveiro, Aveiro, Portugal
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11
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Shemchuk O, Tsenkova BK, Braga D, Duarte MT, André V, Grepioni F. Ionic Co-Crystal Formation as a Path Towards Chiral Resolution in the Solid State. Chemistry 2018; 24:12564-12573. [PMID: 30024647 DOI: 10.1002/chem.201802446] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/16/2018] [Revised: 06/08/2018] [Indexed: 01/15/2023]
Abstract
The preparation and characterization of a whole family of hydrated ionic co-crystals formed by both enantiopure l-proline and racemic dl-proline with LiX (X=Cl, Br, I) are reported. The chiral preference of the lithium cation for homochiral coordination, both in the formation of crystalline conglomerates (with Cl and Br) and racemates (with Cl and I), in which molecules of opposite chirality are confined to distinct crystal layers, is discussed. Dehydration processes for all hydrated crystals have also been investigated.
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Affiliation(s)
- Oleksii Shemchuk
- Dipartimento di Chimica G. Ciamician, Università di Bologna, Via F. Selmi 2, 40126, Bologna, Italy
| | - Boryana K Tsenkova
- Dipartimento di Chimica G. Ciamician, Università di Bologna, Via F. Selmi 2, 40126, Bologna, Italy.,Centro de Química Estrutural, Instituto Superior Técnico, Avenida Rovisco Pais, 1049-001, Lisboa, Portugal
| | - Dario Braga
- Dipartimento di Chimica G. Ciamician, Università di Bologna, Via F. Selmi 2, 40126, Bologna, Italy
| | - M Teresa Duarte
- Centro de Química Estrutural, Instituto Superior Técnico, Avenida Rovisco Pais, 1049-001, Lisboa, Portugal
| | - Vânia André
- Centro de Química Estrutural, Instituto Superior Técnico, Avenida Rovisco Pais, 1049-001, Lisboa, Portugal
| | - Fabrizia Grepioni
- Dipartimento di Chimica G. Ciamician, Università di Bologna, Via F. Selmi 2, 40126, Bologna, Italy
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André V, Quaresma S, da Silva JLF, Duarte MT. Exploring mechanochemistry to turn organic bio-relevant molecules into metal-organic frameworks: a short review. Beilstein J Org Chem 2017; 13:2416-2427. [PMID: 29234469 PMCID: PMC5704760 DOI: 10.3762/bjoc.13.239] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/14/2017] [Accepted: 09/29/2017] [Indexed: 12/16/2022] Open
Abstract
Mechanochemistry is a powerful and environmentally friendly synthetic technique successfully employed in different fields of synthetic chemistry. Application spans from organic to inorganic chemistry including the synthesis of coordination compounds. Metal-organic frameworks (MOFs) are a class of compounds with numerous applications, from which we highlight herein their application in the pharmaceutical field (BioMOFs), whose importance has been growing and is now assuming a relevant and promising domain. The need to find cleaner, greener and more energy and material-efficient synthetic procedures led to the use of mechanochemistry into the synthesis of BioMOFs.
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Affiliation(s)
- Vânia André
- Centro de Química Estrutural, Instituto Superior Técnico, Universidade de Lisboa, Av. Rovisco Pais, 1049-001 Lisbon, Portugal
| | - Sílvia Quaresma
- Centro de Química Estrutural, Instituto Superior Técnico, Universidade de Lisboa, Av. Rovisco Pais, 1049-001 Lisbon, Portugal
| | - João Luís Ferreira da Silva
- Centro de Química Estrutural, Instituto Superior Técnico, Universidade de Lisboa, Av. Rovisco Pais, 1049-001 Lisbon, Portugal
| | - M Teresa Duarte
- Centro de Química Estrutural, Instituto Superior Técnico, Universidade de Lisboa, Av. Rovisco Pais, 1049-001 Lisbon, Portugal
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13
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Martins ICB, Oliveira MC, Diogo HP, Branco LC, Duarte MT. MechanoAPI-ILs: Pharmaceutical Ionic Liquids Obtained through Mechanochemical Synthesis. ChemSusChem 2017; 10:1360-1363. [PMID: 28199779 DOI: 10.1002/cssc.201700153] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.1] [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: 01/26/2017] [Revised: 02/14/2017] [Indexed: 06/06/2023]
Abstract
An alternative, efficient, and green synthetic strategy for the preparation of pharmaceutical ionic liquids using mechanochemistry (MechanoAPI-ILs) is reported. Six new API-ILs based on gabapentin and l-glutamic acid were successfully synthesized and characterized, demonstrating that mechanochemistry is a very promising synthetic strategy. Results compare both the new and the classical approach and clearly show the advantages of the new method. This new technique is faster, solvent free, reproducible, selective, and leads to higher yields.
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Affiliation(s)
- Inês C B Martins
- CQE-Centro de Química Estrutural, Instituto Superior Técnico, Universidade de Lisboa, Av. Rovisco Pais, 1, 1049-001, Lisboa, Portugal
| | - M Conceição Oliveira
- CQE-Centro de Química Estrutural, Instituto Superior Técnico, Universidade de Lisboa, Av. Rovisco Pais, 1, 1049-001, Lisboa, Portugal
| | - Hermínio P Diogo
- CQE-Centro de Química Estrutural, Instituto Superior Técnico, Universidade de Lisboa, Av. Rovisco Pais, 1, 1049-001, Lisboa, Portugal
| | - Luís C Branco
- REQUIMTE-LAQV-Departamento de Química, Faculdade de Ciências e Tecnologia, Universidade Nova de Lisboa, Caparica, 2829-516, Portugal
| | - M Teresa Duarte
- CQE-Centro de Química Estrutural, Instituto Superior Técnico, Universidade de Lisboa, Av. Rovisco Pais, 1, 1049-001, Lisboa, Portugal
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Ferreira da Silva JL, Shimizu K, Teresa Duarte M. The role of halogen interactions in the crystal structure of biscyclopentadienyl dihalides. CrystEngComm 2017. [DOI: 10.1039/c7ce00362e] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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Gomes CSB, Ribeiro AFG, Fernandes AC, Bento A, Rosário Ribeiro M, Kociok-Köhn G, Pascu SI, Duarte MT, Gomes PT. Reactivity of cationic α-diimine cyclopentadienyl nickel complexes towards AlEt2Cl: synthesis, characterisation and ethylene polymerisation. Catal Sci Technol 2017. [DOI: 10.1039/c7cy00875a] [Citation(s) in RCA: 5] [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: 01/14/2023]
Abstract
Cationic α-diimine cyclopentadienyl nickel complexes transform into intermediates upon reaction with AlEt2Cl giving rise to active ethylene polymerisation catalysts.
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Affiliation(s)
- Clara S. B. Gomes
- Centro de Química Estrutural
- Departamento de Engenharia Química
- Instituto Superior Técnico
- Universidade de Lisboa
- 1049-001 Lisboa
| | - Alejandro F. G. Ribeiro
- Centro de Química Estrutural
- Departamento de Engenharia Química
- Instituto Superior Técnico
- Universidade de Lisboa
- 1049-001 Lisboa
| | - Anabela C. Fernandes
- Centro de Química Estrutural
- Departamento de Engenharia Química
- Instituto Superior Técnico
- Universidade de Lisboa
- 1049-001 Lisboa
| | - Artur Bento
- Centro de Química Estrutural
- Departamento de Engenharia Química
- Instituto Superior Técnico
- Universidade de Lisboa
- 1049-001 Lisboa
| | - M. Rosário Ribeiro
- Centro de Química Estrutural
- Departamento de Engenharia Química
- Instituto Superior Técnico
- Universidade de Lisboa
- 1049-001 Lisboa
| | | | | | - M. Teresa Duarte
- Centro de Química Estrutural
- Departamento de Engenharia Química
- Instituto Superior Técnico
- Universidade de Lisboa
- 1049-001 Lisboa
| | - Pedro T. Gomes
- Centro de Química Estrutural
- Departamento de Engenharia Química
- Instituto Superior Técnico
- Universidade de Lisboa
- 1049-001 Lisboa
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Quaresma S, André V, Fernandes A, Duarte MT. Mechanochemistry – A green synthetic methodology leading to metallodrugs, metallopharmaceuticals and bio-inspired metal-organic frameworks. Inorganica Chim Acta 2017. [DOI: 10.1016/j.ica.2016.09.033] [Citation(s) in RCA: 35] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
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17
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Abstract
Euphowelwitschines A (1) and B (2), isolated from a methanolic extract of Euphorbia welwitschii, exhibit a rare combination of structural features in having a 5/8/8 fused-ring system and a 12,15-ether bridge. Moreover, the isolation of the additional new compounds welwitschene (3) and epoxywelwitschene (4) has provided insights into the biogenetic pathway of 12,17-cyclojatrophanes. The structures of 1-4 were determined by spectroscopic methods inclusive of 1D and 2D NMR experiments and X-ray crystallography for compounds 1 and 2. Preliminary information on the selective antiproliferative activity of compounds 1-4 is also described.
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Affiliation(s)
- Mariana A Reis
- Research Institute for Medicines (iMed.ULisboa), Faculty of Pharmacy, Universidade de Lisboa , Avenue Prof. Gama Pinto, 1649-003 Lisbon, Portugal
| | - Vânia André
- Centro de Química Estrutural, Instituto Superior Técnico, Universidade de Lisboa , Avenue Rovisco Pais, 1049-001 Lisbon, Portugal
| | - M Teresa Duarte
- Centro de Química Estrutural, Instituto Superior Técnico, Universidade de Lisboa , Avenue Rovisco Pais, 1049-001 Lisbon, Portugal
| | - Hermann Lage
- Charité Campus Mitte, Institute of Pathology , D-10117 Berlin, Germany
| | - Maria-José U Ferreira
- Research Institute for Medicines (iMed.ULisboa), Faculty of Pharmacy, Universidade de Lisboa , Avenue Prof. Gama Pinto, 1649-003 Lisbon, Portugal
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18
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Teixeira FC, Lucas C, Curto MJM, Teixeira APS, Duarte MT, André V. Novel Bisphosphonates Derived from 1H-Indazole, 1H-Pyrazolo[3,4-b]Pyridine, and 1H-Pyrazolo[3,4-b]Quinoline. Heteroatom Chem 2015. [DOI: 10.1002/hc.21282] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
Affiliation(s)
- Fátima C. Teixeira
- Laboratório Nacional de Energia e Geologia; I.P., Estrada do Paço do Lumiar; 22, 1649-038 Lisboa Portugal
| | - Carla Lucas
- Laboratório Nacional de Energia e Geologia; I.P., Estrada do Paço do Lumiar; 22, 1649-038 Lisboa Portugal
| | - M. João M. Curto
- Laboratório Nacional de Energia e Geologia; I.P., Estrada do Paço do Lumiar; 22, 1649-038 Lisboa Portugal
| | - António P. S. Teixeira
- Departamento de Química; Escola de Ciências e Tecnologia, Centro de Química de Évora, Instituto de Investigação e Formação Avançada, Universidade de Évora; 7000-671 Évora Portugal
- Centro de Química Estrutural; Instituto Superior Técnico, Universidade de Lisboa; 1049-001 Lisboa Portugal
| | - M. Teresa Duarte
- Centro de Química Estrutural; Instituto Superior Técnico, Universidade de Lisboa; 1049-001 Lisboa Portugal
| | - Vânia André
- Centro de Química Estrutural; Instituto Superior Técnico, Universidade de Lisboa; 1049-001 Lisboa Portugal
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19
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Andre V, Duarte MT. Envisaging ZMOFs towards improved drug delivery and release. Acta Crystallogr A Found Adv 2015. [DOI: 10.1107/s2053273315096084] [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: 11/10/2022] Open
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Duarte MT, Martins ICB, Sardo M, Mafra L. Understanding packing interactions and physicochemical properties of novel multicomponent crystal forms of azelaic acid-based anti-inflamatory drugs combining X-ray and NMR. Acta Crystallogr A Found Adv 2015. [DOI: 10.1107/s2053273315096096] [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: 11/10/2022] Open
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Abstract
A hexamine macrobicycle with pyrrolyl spacers was evaluated as an anion receptor in its protonated forms. The protonation constants of the receptor, as well as its association constants with Cl(-), NO3(-), AcO(-), ClO4(-), H2PO4(-), and SO4(2-) were determined by potentiometry at 298.2 ± 0.1 K in H2O-MeOH (50 : 50 v/v) and at an ionic strength of 0.10 ± 0.01 M in KTsO. These studies revealed that the Hnpyrr(n+) receptor has a very high effective association constant value for the SO4(2-) at pH 4.0 (log Keff = 6.42), and it is selective for the uptake of this anion in the presence of the other studied anionic substrates. In particular, the receptor showed very high SO4(2-)/NO3(-) selectivity. Using the indicator-displacement approach the receptor is able to signal the presence of sulfate by a change of color. Single crystal X-ray diffraction determination of [(H6pyrr)(SO4)(H2O)3](SO4)2·9.3H2O revealed the presence of one sulfate anion inside the receptor cavity and showed that the encapsulation of the anion is favored by an array of nine hydrogen bonding interactions, including N-HO, C-HO and water-mediated ones.
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Affiliation(s)
- Pedro Mateus
- Instituto de Tecnologia Química e Biológica António Xavier, Universidade Nova de Lisboa, Av. da República, 2780-157 Oeiras, Portugal.
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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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Ferreira da Silva JL, Harjivan SG, Ferreira AP, Shimizu K, Matilde Marques M, Duarte MT. Effect of substituents in the molecular and supramolecular architectures of 1-ferrocenyl-2-(aryl)thioethanones. CrystEngComm 2015. [DOI: 10.1039/c5ce00149h] [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
Relative positioning of substituents in a molecule is determinant in crystal packing of 1-ferrocenyl-2-(aryl)thioethanone derivatives displaying weak hydrogen bonding ability.
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Affiliation(s)
| | - Shrika G. Harjivan
- Centro de Química Estrutural
- Instituto Superior Técnico
- Universidade de Lisboa
- , Portugal
| | - André P. Ferreira
- Centro de Química Estrutural
- Instituto Superior Técnico
- Universidade de Lisboa
- , Portugal
| | - Karina Shimizu
- Centro de Química Estrutural
- Instituto Superior Técnico
- Universidade de Lisboa
- , Portugal
| | - M. Matilde Marques
- Centro de Química Estrutural
- Instituto Superior Técnico
- Universidade de Lisboa
- , Portugal
| | - M. Teresa Duarte
- Centro de Química Estrutural
- Instituto Superior Técnico
- Universidade de Lisboa
- , Portugal
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Affiliation(s)
- Pedro Mateus
- Instituto de Tecnologia Química
e Biológica António Xavier, Universidade Nova de Lisboa, Avenida da República, 2780-157 Oeiras, Portugal
| | - Rita Delgado
- Instituto de Tecnologia Química
e Biológica António Xavier, Universidade Nova de Lisboa, Avenida 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
| | - M. Teresa Duarte
- Centro de Química
Estrutural, Instituto Superior Técnico, Universidade de Lisboa, Avenida Rovisco Pais, 1049-001 Lisboa, Portugal
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Gomes CS, Duarte MT, Gomes PT. Further iminopyrrolyl complexes of nickel, cobalt, iron and copper: Synthesis and structural characterisation. J Organomet Chem 2014. [DOI: 10.1016/j.jorganchem.2013.10.053] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/26/2022]
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27
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Suresh D, Lopes PS, Ferreira B, Figueira CA, Gomes CSB, Gomes PT, Di Paolo RE, Maçanita AL, Duarte MT, Charas A, Morgado J, Calhorda MJ. Tunable fluorophores based on 2-(N-arylimino)pyrrolyl chelates of diphenylboron: synthesis, structure, photophysical characterization, and application in OLEDs. Chemistry 2014; 20:4126-40. [PMID: 24634317 DOI: 10.1002/chem.201303607] [Citation(s) in RCA: 32] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/11/2013] [Indexed: 11/07/2022]
Abstract
Reactions of 2-(N-arylimino)pyrroles (HNC4H3C(H)=N-Ar) with triphenylboron (BPh3) in boiling toluene afford the respective highly emissive N,N'-boron chelate complexes, [BPh2 {κ(2)N,N'-NC4H3C(H)=N-Ar}] (Ar=C6H5 (12), 2,6-Me2-C6H3 (13), 2,6-iPr2-C6H3 (14), 4-OMe-C6H4 (15), 3,4-Me2-C6 H3 (16), 4-F-C6H4 (17), 4-NO2-C6H4 (18), 4-CN-C6H4 (19), 3,4,5-F3-C6H2 (20), and C6F5 (21)) in moderate to high yields. The photophysical properties of these new boron complexes largely depend on the substituents present on the aryl rings of their N-arylimino moieties. The complexes bearing electron-withdrawing aniline substituents 17-20 show more intense (e.g., ϕf =0.71 for Ar=4-CN-C6H4 (19) in THF), higher-energy (blue) fluorescent emission compared to those bearing electron-donating substituents, for which the emission is redshifted at the expense of lower quantum yields (ϕf=0.13 and 0.14 for Ar=4-OMe-C6H4 (15) and 3,4-Me2-C6H3 (16), respectively, in THF). The presence of substituents bulkier than a hydrogen atom at the 2,6-positions of the aryl groups strongly restricts rotation of this moiety towards coplanarity with the iminopyrrolyl ligand framework, inducing a shift in the emission to the violet region (λmax =410-465 nm) and a significant decrease in quantum yield (ϕf=0.005, 0.023, and 0.20 for Ar=2,6-Me2-C6H3 (13), 2,6-iPr2-C6H3 (14), and C6F5 (21), respectively, in THF), even when electron-withdrawing groups are also present. Density functional theory (DFT) and time-dependent DFT (TD-DFT) calculations have indicated that the excited singlet state has a planar aryliminopyrrolyl ligand, except when prevented by steric hindrance (ortho substituents). Calculated absorption maxima reproduce the experimental values, but the error is higher for the emission wavelengths. Organic light-emitting diodes (OLEDs) have been fabricated with the new boron complexes, with luminances of the order of 3000 cd m(-2) being achieved for a green-emitting device.
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Affiliation(s)
- D Suresh
- 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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Coelho JAS, Trindade AF, André V, Teresa Duarte M, Veiros LF, Afonso CAM. Trienamines derived from 5-substituted furfurals: remote ε-functionalization of 2,4-dienals. Org Biomol Chem 2014; 12:9324-8. [DOI: 10.1039/c4ob01759e] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.9] [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
The remote selective ε-functionalization of 5-substituted furfurals by trienamine catalysis is described, resulting in a new scaffold.
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Affiliation(s)
- Jaime A. S. Coelho
- Instituto de Investigação do Medicamento (iMed.ULisboa)
- Faculdade de Farmácia
- Universidade de Lisboa
- 1649-003 Lisboa, Portugal
| | - Alexandre F. Trindade
- Instituto de Investigação do Medicamento (iMed.ULisboa)
- Faculdade de Farmácia
- Universidade de Lisboa
- 1649-003 Lisboa, Portugal
- CQFM
| | - Vânia André
- Centro de Química Estrutural
- Instituto Superior Técnico
- Universidade de Lisboa
- Lisboa, Portugal
| | - M. Teresa Duarte
- Centro de Química Estrutural
- Instituto Superior Técnico
- Universidade de Lisboa
- Lisboa, Portugal
| | - Luis F. Veiros
- Centro de Química Estrutural
- Instituto Superior Técnico
- Universidade de Lisboa
- Lisboa, Portugal
| | - Carlos A. M. Afonso
- Instituto de Investigação do Medicamento (iMed.ULisboa)
- Faculdade de Farmácia
- Universidade de Lisboa
- 1649-003 Lisboa, Portugal
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Paterna R, André V, Duarte MT, Veiros LF, Candeias NR, Gois PMP. Ring-Expansion Reaction of Isatins with Ethyl Diazoacetate Catalyzed by Dirhodium(II)/DBU Metal-Organic System: En Route to Viridicatin Alkaloids. European J Org Chem 2013. [DOI: 10.1002/ejoc.201300796] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
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Barroso S, Madeira F, Calhorda MJ, Ferreira MJ, Duarte MT, Martins AM. Toward the understanding of radical reactions: experimental and computational studies of titanium(III) diamine bis(phenolate) complexes. Inorg Chem 2013; 52:9427-39. [PMID: 23924047 DOI: 10.1021/ic401008y] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/18/2023]
Abstract
Radical reactions of titanium(III) [Ti((tBu2)O2NN')Cl(S)] (S = THF, 1; S = py, 2; (tBu2)O2NN' = Me2N(CH2)2N(CH2-2-O-3,5-(t)Bu2C6H2)2) are described. Reactions with neutral electron acceptors led to metal oxidation to Ti(IV), [Ti((tBu2)O2NN')Cl(TEMPO)] (4) being formed with the TEMPO radical and [Ti((tBu2)O2NN')Cl2] (9) with PhN═NPh. [Ti((tBu2)O2NN')Cl2] was also formed when [Ti((tBu2)O2NN')Cl(S)] was oxidized by [Cp2Fe][BPh4], but the [Cp2Fe][PF6] analogue yielded [Ti((tBu2)O2NN')ClF] (8). The reactions of [Ti((tBu2)O2NN')Cl(S)] with O2 gave [Ti((tBu2)O2NN')Cl]2(μ-O) (3). The DFT calculated Gibbs energy for the above reaction showed it to be exergonic (ΔG298 = -123.6 kcal·mol(-1)). [Ti((tBu2)O2NN')(CH2Ph)(S)] (S = THF, 5; py, 6) are not stable in solution for long periods and in diethyl ether gave 1:1 cocrystals of [Ti((tBu2)O2NN')(CH2Ph)2] (7) and [Ti((tBu2)O2NN')Cl]2(μ-O) (3), most probably resulting from a disproportionation process of titanium(III) followed by oxygen abstraction by the resulting Ti(II) species. The oxidation of [Ti((tBu2)O2NN')(κ(2)-{CH2-2-(NMe2)-C6H4})] (10), which is a Ti(III) benzyl stabilized by the intramolecular coordination of the NMe2 moiety, led to a complex mixture. Recrystallization of this mixture under air led to a 1:1 cocrystal of two coordination isomers of the titanium oxo dimer (3). In one of these isomers, one metal is pentacoordinate and the dimethylamine moiety of the diamine bis(phenolate) ligand is not bonded to the metal, displaying a coordination mode of the ligand never observed before. The other titanium center is distorted octahedral with two cis-phenolate moieties. In the second unit, the coordination of the two ancillary ligands to the titanium centers reveals mutually cis-phenolate groups in one-half of the molecule and trans-coordinated in the other titanium center, keeping a distorted octahedral environment around each titanium.
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Affiliation(s)
- Sónia Barroso
- Centro de Química Estrutural, Instituto Superior Técnico, TU Lisbon, 1049-001 Lisboa, Portugal
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Santos FMF, Rosa JN, André V, Duarte MT, Veiros LF, Gois PMP. N-Heterocyclic Carbene Catalyzed Addition of Aldehydes to Diazo Compounds: Stereoselective Synthesis of N-Acylhydrazones. Org Lett 2013; 15:1760-3. [DOI: 10.1021/ol400563w] [Citation(s) in RCA: 24] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Fábio M. F. Santos
- Research Institute for Medicines and Pharmaceutical Sciences (iMed.UL), Faculty of Pharmacy, University of Lisbon, Av. Prof. Gama Pinto, 1649-003 Lisbon, Portugal, and Centro de Química Estrutural, Departamento de Engenharia Química, Instituto Superior Técnico, Universidade Técnica de Lisboa, 1049-001 Lisboa, Portugal
| | - João N. Rosa
- Research Institute for Medicines and Pharmaceutical Sciences (iMed.UL), Faculty of Pharmacy, University of Lisbon, Av. Prof. Gama Pinto, 1649-003 Lisbon, Portugal, and Centro de Química Estrutural, Departamento de Engenharia Química, Instituto Superior Técnico, Universidade Técnica de Lisboa, 1049-001 Lisboa, Portugal
| | - Vânia André
- Research Institute for Medicines and Pharmaceutical Sciences (iMed.UL), Faculty of Pharmacy, University of Lisbon, Av. Prof. Gama Pinto, 1649-003 Lisbon, Portugal, and Centro de Química Estrutural, Departamento de Engenharia Química, Instituto Superior Técnico, Universidade Técnica de Lisboa, 1049-001 Lisboa, Portugal
| | - M. Teresa Duarte
- Research Institute for Medicines and Pharmaceutical Sciences (iMed.UL), Faculty of Pharmacy, University of Lisbon, Av. Prof. Gama Pinto, 1649-003 Lisbon, Portugal, and Centro de Química Estrutural, Departamento de Engenharia Química, Instituto Superior Técnico, Universidade Técnica de Lisboa, 1049-001 Lisboa, Portugal
| | - Luís F. Veiros
- Research Institute for Medicines and Pharmaceutical Sciences (iMed.UL), Faculty of Pharmacy, University of Lisbon, Av. Prof. Gama Pinto, 1649-003 Lisbon, Portugal, and Centro de Química Estrutural, Departamento de Engenharia Química, Instituto Superior Técnico, Universidade Técnica de Lisboa, 1049-001 Lisboa, Portugal
| | - Pedro M. P. Gois
- Research Institute for Medicines and Pharmaceutical Sciences (iMed.UL), Faculty of Pharmacy, University of Lisbon, Av. Prof. Gama Pinto, 1649-003 Lisbon, Portugal, and Centro de Química Estrutural, Departamento de Engenharia Química, Instituto Superior Técnico, Universidade Técnica de Lisboa, 1049-001 Lisboa, Portugal
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Li L, Lopes PS, Figueira CA, Gomes CSB, Duarte MT, Rosa V, Fliedel C, Avilés T, Gomes PT. Cationic and Neutral (Ar‐BIAN)Copper(I) Complexes Containing Phosphane and Arsane Ancillary Ligands: Synthesis, Molecular Structure and Catalytic Behaviour in Cycloaddition Reactions of Azides and Alkynes. Eur J Inorg Chem 2013. [DOI: 10.1002/ejic.201300207] [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: 11/06/2022]
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Li L, Lopes PS, Figueira CA, Gomes CSB, Duarte MT, Rosa V, Fliedel C, Avilés T, Gomes PT. Cationic and Neutral (Ar‐BIAN)Copper(I) Complexes Containing Phosphane and Arsane Ancillary Ligands: Synthesis, Molecular Structure and Catalytic Behaviour in Cycloaddition Reactions of Azides and Alkynes (Eur. J. Inorg. Chem. 9/2013). Eur J Inorg Chem 2013. [DOI: 10.1002/ejic.201390037] [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: 11/07/2022]
Affiliation(s)
- Lidong Li
- Centro de Química Estrutural, Departamento de Engenharia Química, Instituto Superior Técnico, Universidade Técnica de Lisboa, Av. Rovisco Pais, 1049‐001 Lisboa, Portugal, Fax: +351‐218417246, http://cqe.ist.utl.pt/
| | - Patrícia S. Lopes
- Centro de Química Estrutural, Departamento de Engenharia Química, Instituto Superior Técnico, Universidade Técnica de Lisboa, Av. Rovisco Pais, 1049‐001 Lisboa, Portugal, Fax: +351‐218417246, http://cqe.ist.utl.pt/
| | - Cláudia A. Figueira
- Centro de Química Estrutural, Departamento de Engenharia Química, Instituto Superior Técnico, Universidade Técnica de Lisboa, Av. Rovisco Pais, 1049‐001 Lisboa, Portugal, Fax: +351‐218417246, http://cqe.ist.utl.pt/
| | - Clara S. B. Gomes
- Centro de Química Estrutural, Departamento de Engenharia Química, Instituto Superior Técnico, Universidade Técnica de Lisboa, Av. Rovisco Pais, 1049‐001 Lisboa, Portugal, Fax: +351‐218417246, http://cqe.ist.utl.pt/
| | - M. Teresa Duarte
- Centro de Química Estrutural, Departamento de Engenharia Química, Instituto Superior Técnico, Universidade Técnica de Lisboa, Av. Rovisco Pais, 1049‐001 Lisboa, Portugal, Fax: +351‐218417246, http://cqe.ist.utl.pt/
| | - Vitor Rosa
- REQUIMTE, Departamento de Química, Faculdade de Ciências e Tecnologia, Universidade Nova de Lisboa, Caparica 2829‐516, Portugal, http://www.requimte.pt
| | - Christophe Fliedel
- REQUIMTE, Departamento de Química, Faculdade de Ciências e Tecnologia, Universidade Nova de Lisboa, Caparica 2829‐516, Portugal, http://www.requimte.pt
| | - Teresa Avilés
- REQUIMTE, Departamento de Química, Faculdade de Ciências e Tecnologia, Universidade Nova de Lisboa, Caparica 2829‐516, Portugal, http://www.requimte.pt
| | - Pedro T. Gomes
- Centro de Química Estrutural, Departamento de Engenharia Química, Instituto Superior Técnico, Universidade Técnica de Lisboa, Av. Rovisco Pais, 1049‐001 Lisboa, Portugal, Fax: +351‐218417246, http://cqe.ist.utl.pt/
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Simao C, Mas-Torrent M, André V, Teresa Duarte M, Techert S, Veciana J, Rovira C. Solid state photodimerisation of tetrathiafulvalene derivatives bearing carboxylate and carboxylic acid substituents. CrystEngComm 2013. [DOI: 10.1039/c3ce41353e] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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Teixeira FC, Lucas C, Curto MJM, Neves M, Duarte MT, André V, Teixeira APS. New 1-Hydroxy-1,1-bisphosphonates Derived from 1H-Pyrazolo[3,4-b]pyridine: Synthesis and Characterization. J BRAZIL CHEM SOC 2013. [DOI: 10.5935/0103-5053.20130164] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022] Open
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Simao C, Mas-Torrent M, André V, Duarte MT, Veciana J, Rovira C. Intramolecular electron transfer in the photodimerisation product of a tetrathiafulvalene derivative in solution and on a surface. Chem Sci 2013. [DOI: 10.1039/c2sc21134c] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
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Martins I, Martins M, Fernandes A, André V, Duarte MT. An insight into dapsone co-crystals: sulfones as participants in supramolecular interactions. CrystEngComm 2013. [DOI: 10.1039/c3ce41323c] [Citation(s) in RCA: 27] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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Candeias NR, Carias C, Gomes LFR, André V, Duarte MT, Gois PMP, Afonso CAM. Asymmetric Intramolecular CH Insertion of α-Diazoacetamides in Water by Dirhodium(II) Catalysts Derived from Natural Amino Acids. Adv Synth Catal 2012. [DOI: 10.1002/adsc.201200101] [Citation(s) in RCA: 24] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
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Alves LG, Martins AM, Duarte MT. Magnesium Cyclam complexes with a Mg2(Bn2Cyclam) core: Structural characterization of Mg2(Bn2Cyclam)I2 and Mg2(Bn2Cyclam){μ-H}{μ-F-C6F4}2BC6F5. J Mol Struct 2012. [DOI: 10.1016/j.molstruc.2012.05.039] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
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Morais TS, Garcia MH, Robalo MP, Piedade M, Duarte MT, Villa de Brito MJ, Amorim Madeira PJ. Synthesis and structural characterization of new piano-stool ruthenium(II) complexes bearing 1-butylimidazole heteroaromatic ligand. J Organomet Chem 2012. [DOI: 10.1016/j.jorganchem.2012.04.024] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
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Montalbano F, Candeias NR, Veiros LF, André V, Duarte MT, Bronze MR, Moreira R, Gois PMP. Four-component assembly of chiral N-B heterocycles with a natural product-like framework. Org Lett 2012; 14:988-91. [PMID: 22316104 DOI: 10.1021/ol203224n] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
The dative N-B bond was used to simply assemble heterocycles with a skeleton akin to the 5-oxofuro[2,3-b]furan motif. Twenty-five new N-B heterocycles were prepared via a highly efficient one-pot four-component reaction in yields and diastereoselectivities up to 95% and >97%, respectively. Several reaction intermediates were discovered using electrospray ionization mass spectroscopy which set the basis for the mechanism elucidation using DFT calculations.
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Affiliation(s)
- Francesco Montalbano
- Research Institute for Medicines and Pharmaceutical Sciences, Faculty of Pharmacy, University of Lisbon, Av. Prof. Gama Pinto, 1649-003 Lisbon, Portugal
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Li L, Lopes PS, Rosa V, Figueira CA, Lemos MANDA, Duarte MT, Avilés T, Gomes PT. Synthesis and structural characterisation of (aryl-BIAN)copper(i) complexes and their application as catalysts for the cycloaddition of azides and alkynes. Dalton Trans 2012; 41:5144-54. [DOI: 10.1039/c2dt11854h] [Citation(s) in RCA: 53] [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] [Indexed: 01/10/2023]
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Suresh D, Gomes CSB, Gomes PT, Di Paolo RE, Maçanita AL, Calhorda MJ, Charas A, Morgado J, Teresa Duarte M. Syntheses and photophysical properties of new iminopyrrolyl boron complexes and their application in efficient single-layer non-doped OLEDs prepared by spin coating. Dalton Trans 2012; 41:8502-5. [DOI: 10.1039/c2dt30487b] [Citation(s) in RCA: 48] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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Barroso S, Adão P, Duarte MT, Meetsma A, Pessoa JC, Bouwkamp MW, Martins AM. Chiral Diamine Bis(phenolate) TiIV and ZrIV Complexes - Synthesis, Structures and Reactivity. Eur J Inorg Chem 2011. [DOI: 10.1002/ejic.201100470] [Citation(s) in RCA: 16] [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: 11/07/2022]
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Gomes CSB, Figueira CA, Lopes PS, Suresh D, Gomes PT, Duarte MT. Iminopyrrole derivatives containing electron-withdrawing substituents: the formation of dimers and supramolecular arrangements. Acta Crystallogr C 2011; 67:o315-8. [PMID: 21817800 DOI: 10.1107/s0108270111027491] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/03/2011] [Accepted: 07/08/2011] [Indexed: 11/11/2022] Open
Abstract
The crystal structures of two p-substituted phenylformiminopyrrole derivatives, namely 2-[(4-fluorophenyl)iminomethyl]pyrrole, C(11)H(9)FN(2), (1), and 2-[(1H-pyrrol-2-ylmethylidene)amino]benzonitrile, C(12)H(9)N(3), (2), bear F and C[triple-bond]N electron-withdrawing groups, respectively. Both structures feature two independent molecules in the asymmetric unit forming dimers via N-H...N hydrogen bonds. In the case of (1), each dimer interacts with two other dimers via C-H...F contacts, thus forming one-dimensional chains in the b direction, whereas in the case of (2), a weak C-H...N interaction connects the dimers in one-dimensional chains in the (110) direction.
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Affiliation(s)
- Clara S B Gomes
- Centro de Química Estrutural, Departamento de Engenharia Química e Biológica, Instituto Superior Técnico, Universidade Técnica de Lisboa, Lisboa, Portugal
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André V, Hardeman A, Halasz I, Stein RS, Jackson GJ, Reid DG, Duer MJ, Curfs C, Duarte MT, Friščić T. Mechanosynthesis of the metallodrug bismuth subsalicylate from Bi2O3 and structure of bismuth salicylate without auxiliary organic ligands. Angew Chem Int Ed Engl 2011; 50:7858-61. [PMID: 21739550 DOI: 10.1002/anie.201103171] [Citation(s) in RCA: 101] [Impact Index Per Article: 7.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/09/2011] [Revised: 05/24/2011] [Indexed: 11/09/2022]
Affiliation(s)
- Vânia André
- Centro de Quimica Estrutural, Instituto Superior Técnico, Universidade Técnica de Lisboa, Portugal
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Gomes CS, Carabineiro SA, Gomes PT, Teresa Duarte M, Lemos MAN. Octahedral Co(III) complexes of 2-(phenylimino)pyrrolyl ligands: Synthesis and structural characterisation. Inorganica Chim Acta 2011. [DOI: 10.1016/j.ica.2010.12.032] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
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Ferreira da Silva JL, Ferreira AP, Marques MM, Harjivan SG, M. da Piedade MF, Duarte MT. Effect of C–H…X interactions (X = O, S, π) in the supramolecular arrangements of 3-ferrocenyl-methoxybenzo[b]thiophene isomers. CrystEngComm 2011. [DOI: 10.1039/c0ce00434k] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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