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Ramos ML, Justino LLG, Barata R, Costa T, Burrows HD. Complexes of In(III) with 8-hydroxyquinoline-5-sulfonate in solution: structural studies and the effect of cationic surfactants on the photophysical behaviour. Dalton Trans 2021; 50:16970-16983. [PMID: 34752595 DOI: 10.1039/d1dt02858h] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Following previous studies on the complexation in aqueous solutions of 8-hydroxyquinoline-5-sulfonate (8-HQS) with the trivalent metal ions, Al(III) and Ga(III) and various other metal ions, using multinuclear NMR, DFT calculations, UV-vis absorption and luminescence techniques, we have extended our studies on 8-HQS complexation to the trivalent metal ion In(III). The study combines the high sensitivity of luminescence techniques and the selectivity of multinuclear NMR spectroscopy with the structural details accessible through DFT calculations, and aims to obtain a complete understanding of the complexation between the In3+ metal ion and 8-HQS, and how this influences the luminescence behaviour. A full speciation study has been performed and, as has been reported for the complexes of 8-hydroxyquinoline (8-HQ), the dominant complexes of 8-HQS with In(III) show marked differences in the complexation behaviour when compared with the equivalent complexes with the other group 13 cations Al(III) and Ga(III). While all three complexes have a 1 : 3 (metal : ligand) stoichiometry, those with Al(III) and Ga(III) show a mer-geometry of the ligands around the metal centre, whereas the fac-geometry is observed for the complexes with In(III). On binding to metal ions, 8-HQS shows a marked increase in the intensity of the fluorescence emission band compared to that of the virtually non-luminescent free ligand. However, the increase for In(III) is less pronounced than with Al(III) or Ga(III). These observations have important implications for the application of the complexes in sensing, light emitting devices (e.g. OLEDs), or as electron transport layers in photovoltaics for solar energy conversion. Furthermore, surfactant complexation is known to improve the fluorescence intensity in metal complexes with 8-HQS, by inhibiting the ligand exchange, as we have reported for complexes of HQS with Al(III) and Ga(III). Accordingly, in view of the development of applications in either sensing or optoelectronics, our interest also includes the study of HQS complexes of In(III) in the presence of cationic surfactants, in comparison with previous results with Al(III) and Ga(III).
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Affiliation(s)
- M Luísa Ramos
- Chemistry Department and Coimbra Chemistry Centre, University of Coimbra, 3004-535 Coimbra, Portugal.
| | - Licínia L G Justino
- Chemistry Department and Coimbra Chemistry Centre, University of Coimbra, 3004-535 Coimbra, Portugal.
| | - Rui Barata
- Chemistry Department and Coimbra Chemistry Centre, University of Coimbra, 3004-535 Coimbra, Portugal.
| | - Telma Costa
- Chemistry Department and Coimbra Chemistry Centre, University of Coimbra, 3004-535 Coimbra, Portugal.
| | - Hugh D Burrows
- Chemistry Department and Coimbra Chemistry Centre, University of Coimbra, 3004-535 Coimbra, Portugal.
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Koo JY, Oh J, Hyun G, Choi HC, Song I, Yoon SM. Anisotropic Electrical Conductivity of a Single-Crystalline Oxo-Bridged Cr 4IIIMo 2VI Heterometallic Complex. Inorg Chem 2021; 60:13262-13268. [PMID: 34375084 DOI: 10.1021/acs.inorgchem.1c01618] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
A new oxo-bridged chromium-molybdenum heterometallic complex, O-CrMoHC ([Cr4(MoO4)2O2(OAc)4(DMF)4]·2DMF), was synthesized by using a simple solvothermal reaction. In this complex, the octahedrally coordinated Cr(III) and tetrahedrally coordinated Mo(VI) metal centers are bridged by oxo ligands. O-CrMoHC has in-plane π-conjugation systems, which are interconnected by noncoordinating DMF molecules. The crystals show anisotropic conductivity with respect to the crystal planes, and theoretical calculations were used to study their origins. The O-CrMoHC single crystals exhibited that a relatively high electrical conductivity with an average value of 5.37 × 10-7 S/cm was observed along the [01-1] direction, but the current level was very low along the [100] direction. This is the first report of anisotropic conductivity observed in the single crystal of a monomeric heterometallic complex.
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Affiliation(s)
- Jin Young Koo
- Department of Chemistry, Pohang University of Science and Technology (POSTECH), 77, Cheongam-ro, Nam-Gu, Pohang-si, Korea 37673
| | - Jongwon Oh
- Department of Chemistry, Wonkwang University, 460 Iksandae-ro, Iksan, Jeonbuk, Korea 54538.,Wonkang Materials Institute of Science and Technology, 460 Iksandae-ro, Iksan, Jeonbuk, Korea 54538
| | - Gyeongeun Hyun
- Department of Chemistry, Wonkwang University, 460 Iksandae-ro, Iksan, Jeonbuk, Korea 54538.,Wonkang Materials Institute of Science and Technology, 460 Iksandae-ro, Iksan, Jeonbuk, Korea 54538
| | - Hee Cheul Choi
- Department of Chemistry, Pohang University of Science and Technology (POSTECH), 77, Cheongam-ro, Nam-Gu, Pohang-si, Korea 37673
| | - Intek Song
- Department of Applied Chemistry, Andong National University, 1375 Gyeongdong-ro, Andong, Gyeongbuk, Korea 36729
| | - Seok Min Yoon
- Department of Chemistry, Wonkwang University, 460 Iksandae-ro, Iksan, Jeonbuk, Korea 54538.,Wonkang Materials Institute of Science and Technology, 460 Iksandae-ro, Iksan, Jeonbuk, Korea 54538
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Pires AS, Batista J, Murtinho D, Nogueira C, Karamysheva A, Luísa Ramos M, Milne BF, Tavares NT, Gonçalves J, Gonçalves AC, Abrantes AM, Soares R, Gonçalves T, Botelho MF, Silva Serra ME. Synthesis, Characterization and Evaluation of the Antibacterial and Antitumor Activity of HalogenatedSalen Copper (II) Complexes derived from Camphoric Acid. Appl Organomet Chem 2020. [DOI: 10.1002/aoc.5569] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022]
Affiliation(s)
- Ana Salomé Pires
- Biophysics Institute, Coimbra Institute for Clinical and Biomedical Research (iCBR) area of Environment Genetics and Oncobiology (CIMAGO), Faculty of MedicineUniversity of Coimbra 3000‐548 Coimbra Portugal
- CNC.IBILI Consortium/Center for Innovative Biomedicine and Biotechnology (CIBB)University of Coimbra 3000‐548 Coimbra Portugal
| | - João Batista
- Biophysics Institute, Coimbra Institute for Clinical and Biomedical Research (iCBR) area of Environment Genetics and Oncobiology (CIMAGO), Faculty of MedicineUniversity of Coimbra 3000‐548 Coimbra Portugal
- Centro de Química, Department of ChemistryUniversity of Coimbra 3004‐535 Coimbra Portugal
| | - Dina Murtinho
- Centro de Química, Department of ChemistryUniversity of Coimbra 3004‐535 Coimbra Portugal
| | - Célia Nogueira
- CNC ‐ Centre for Neuroscience and Cell BiologyUniversity of Coimbra 3004‐535 Coimbra Portugal
- Institute of Microbiology, Faculty of MedicineUniversity of Coimbra 3004‐535 Coimbra Portugal
| | - Anna Karamysheva
- Institute of Microbiology, Faculty of MedicineUniversity of Coimbra 3004‐535 Coimbra Portugal
| | - M. Luísa Ramos
- Centro de Química, Department of ChemistryUniversity of Coimbra 3004‐535 Coimbra Portugal
| | - Bruce F. Milne
- CFisUC, Department of PhysicsUniversity of Coimbra Rua Larga 3004‐516 Coimbra Portugal
- Nano‐Bio Spectroscopy Group and ETSF Scientific Development Centre, Departamento de Física de MaterialesUniversidad del País Vasco UPV/EHU E‐20018 San Sebastián Spain
| | - Nuno Tiago Tavares
- Biophysics Institute, Coimbra Institute for Clinical and Biomedical Research (iCBR) area of Environment Genetics and Oncobiology (CIMAGO), Faculty of MedicineUniversity of Coimbra 3000‐548 Coimbra Portugal
| | - José Gonçalves
- Biophysics Institute, Coimbra Institute for Clinical and Biomedical Research (iCBR) area of Environment Genetics and Oncobiology (CIMAGO), Faculty of MedicineUniversity of Coimbra 3000‐548 Coimbra Portugal
| | - Ana Cristina Gonçalves
- Biophysics Institute, Coimbra Institute for Clinical and Biomedical Research (iCBR) area of Environment Genetics and Oncobiology (CIMAGO), Faculty of MedicineUniversity of Coimbra 3000‐548 Coimbra Portugal
- CNC.IBILI Consortium/Center for Innovative Biomedicine and Biotechnology (CIBB)University of Coimbra 3000‐548 Coimbra Portugal
- Laboratory of Oncobiology and Hematology and University Clinic of Hematology/Faculty of MedicineUniversity of Coimbra 3000‐548 Coimbra Portugal
| | - Ana Margarida Abrantes
- Biophysics Institute, Coimbra Institute for Clinical and Biomedical Research (iCBR) area of Environment Genetics and Oncobiology (CIMAGO), Faculty of MedicineUniversity of Coimbra 3000‐548 Coimbra Portugal
- CNC.IBILI Consortium/Center for Innovative Biomedicine and Biotechnology (CIBB)University of Coimbra 3000‐548 Coimbra Portugal
| | - Rui Soares
- Institute of Microbiology, Faculty of MedicineUniversity of Coimbra 3004‐535 Coimbra Portugal
- Department of Clinical Pathology ServiceInstituto Português de Oncologia de Coimbra Francisco Gentil EPE 3000‐075 Coimbra Portugal
| | - Teresa Gonçalves
- CNC ‐ Centre for Neuroscience and Cell BiologyUniversity of Coimbra 3004‐535 Coimbra Portugal
- Institute of Microbiology, Faculty of MedicineUniversity of Coimbra 3004‐535 Coimbra Portugal
| | - Maria Filomena Botelho
- Biophysics Institute, Coimbra Institute for Clinical and Biomedical Research (iCBR) area of Environment Genetics and Oncobiology (CIMAGO), Faculty of MedicineUniversity of Coimbra 3000‐548 Coimbra Portugal
- CNC.IBILI Consortium/Center for Innovative Biomedicine and Biotechnology (CIBB)University of Coimbra 3000‐548 Coimbra Portugal
| | - M. Elisa Silva Serra
- Centro de Química, Department of ChemistryUniversity of Coimbra 3004‐535 Coimbra Portugal
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Jiang H, Lu R, Si X, Luo X, Xu J, Lu F. Single‐Site Molybdenum Catalyst for the Synthesis of Fumarate. ChemCatChem 2019. [DOI: 10.1002/cctc.201900332] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
Affiliation(s)
- Huifang Jiang
- State Key Laboratory of Catalysis Dalian Institute of Chemical Physics Chinese Academy of SciencesDalian National Laboratory for Clean Energy Dalian 116023 P.R. China
- University of Chinese Academy of Sciences Beijing 100049 P.R. China
| | - Rui Lu
- State Key Laboratory of Catalysis Dalian Institute of Chemical Physics Chinese Academy of SciencesDalian National Laboratory for Clean Energy Dalian 116023 P.R. China
| | - Xiaoqin Si
- State Key Laboratory of Catalysis Dalian Institute of Chemical Physics Chinese Academy of SciencesDalian National Laboratory for Clean Energy Dalian 116023 P.R. China
- University of Chinese Academy of Sciences Beijing 100049 P.R. China
| | - Xiaolin Luo
- State Key Laboratory of Catalysis Dalian Institute of Chemical Physics Chinese Academy of SciencesDalian National Laboratory for Clean Energy Dalian 116023 P.R. China
- University of Chinese Academy of Sciences Beijing 100049 P.R. China
| | - Jie Xu
- State Key Laboratory of Catalysis Dalian Institute of Chemical Physics Chinese Academy of SciencesDalian National Laboratory for Clean Energy Dalian 116023 P.R. China
| | - Fang Lu
- State Key Laboratory of Catalysis Dalian Institute of Chemical Physics Chinese Academy of SciencesDalian National Laboratory for Clean Energy Dalian 116023 P.R. China
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The structure and diffusion behaviour of the 1:1 copper(II) complex of ethambutol in aqueous solution. J Mol Liq 2018. [DOI: 10.1016/j.molliq.2018.04.039] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
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Ramos ML, Justino LLG, Barata R, Costa T, Nogueira BA, Fausto R, Burrows HD. Oxocomplexes of U(vi) with 8-hydroxyquinoline-5-sulfonate in solution: structural studies and photophysical behaviour. Dalton Trans 2017; 46:9358-9368. [PMID: 28548670 DOI: 10.1039/c7dt01324h] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Multinuclear (1H and 13C) NMR, and Raman spectroscopy, combined with DFT calculations, provide detailed information on the complexation between U(vi) oxoions and 8-hydroxyquinoline-5-sulfonate (8-HQS) in aqueous solution. Over the concentration region studied, U(vi) oxoions (uranyl ions) form one dominant complex with 8-HQS in water in the pH range 3-6, a mononuclear 1 : 2 (metal : ligand) complex, with the metal centre (UO22+) coordinated to two 8-HQS ligands, together with one or more water molecules. An additional minor 1 : 1 complex has also been detected for solutions with a 1 : 1 metal : ligand molar ratio. The geometry of the dominant complex is proposed based on the combination of the NMR and Raman results with DFT calculations. Further information on the electronic structure of the complex has been obtained from UV/visible absorption and luminescence spectra. The complex of U(vi) and 8-HQS is non-luminescent, in contrast to what has been observed with this ligand and many other metal ions. We suggest that this is due to the presence of low-lying ligand-to-metal charge transfer (LMCT) states below the emitting ligand-based and uranyl-based levels which quench their emission. These studies have fundamental importance and are also relevant in the context of environmental studies, and the water soluble ligand 8-HQS has been chosen for application in uranium remediation of aqueous environments.
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Affiliation(s)
- M Luísa Ramos
- Centro de Química and Department of Chemistry, University of Coimbra, 3004-535 Coimbra, Portugal.
| | - Licínia L G Justino
- Centro de Química and Department of Chemistry, University of Coimbra, 3004-535 Coimbra, Portugal.
| | - Rui Barata
- Centro de Química and Department of Chemistry, University of Coimbra, 3004-535 Coimbra, Portugal.
| | - Telma Costa
- Centro de Química and Department of Chemistry, University of Coimbra, 3004-535 Coimbra, Portugal.
| | - Bernardo A Nogueira
- Centro de Química and Department of Chemistry, University of Coimbra, 3004-535 Coimbra, Portugal.
| | - Rui Fausto
- Centro de Química and Department of Chemistry, University of Coimbra, 3004-535 Coimbra, Portugal.
| | - Hugh D Burrows
- Centro de Química and Department of Chemistry, University of Coimbra, 3004-535 Coimbra, Portugal.
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Burrows HD, Costa T, Ramos ML, Valente AJM, Stewart B, Justino LLG, Almeida AIA, Catarina NL, Mallavia R, Knaapila M. Self-assembled systems of water soluble metal 8-hydroxyquinolates with surfactants and conjugated polyelectrolytes. Phys Chem Chem Phys 2016; 18:16629-40. [PMID: 26817700 DOI: 10.1039/c5cp07085f] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/01/2023]
Abstract
We have studied the interaction of 8-hydroxyquinoline-5-sulfonate (8-HQS) with the metal ions Al(iii) and Zn(ii) in aqueous solution in the presence of tetraalkylammonium surfactants using UV/vis absorption, fluorescence, NMR spectroscopy and electrical conductivity measurements, complemented by DFT calculations and molecular dynamics (MD) simulations. Under appropriate conditions, complexes between 8-HQS and metal ions form rapidly, and have similar electronic, spectroscopic and photophysical properties to the corresponding metal quinolates, such as Alq3. These interact with the cationic surfactants, leading to marked increases in fluorescence intensity. However, significant differences are seen in the behavior of the two metal ions. With aluminium, a stable [Al(8-QS)3](3-) anion is formed, and interacts, predominantly through electrostatic interactions, with the surfactant, without disrupting the metal ion coordination sphere. In contrast, with Zn(ii), there is a competition between the metal ion and surfactants in the interaction with 8-HQS, although the [Zn(8-QS)2(H2O)2](2-) species is stable at appropriate pH and surfactant concentration. The studies are extended to systems with the conjugated polyelectrolyte (CPE) poly-(9,9-bis(6-N,N,N-trimethylammonium)hexyl)-fluorene-phenylene bromide (HTMA-PFP), which has a similar alkylammonium chain to the surfactants. Mixing metal salt, 8-HQS and HTMA-PFP in the presence of a nonionic surfactant leads to the formation of a metal complex/CPE supramolecular assembly between the conjugated polyelectrolyte and the metal/8-HQS complex, as demonstrated by electronic energy transfer. The potential of these systems in sensing, light harvesting, and electron injection/transport layers in organic semiconductor devices is discussed.
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Affiliation(s)
- Hugh D Burrows
- Centro de Química, Department of Chemistry, University of Coimbra, 3004-535 Coimbra, Portugal.
| | - Telma Costa
- Centro de Química, Department of Chemistry, University of Coimbra, 3004-535 Coimbra, Portugal.
| | - M Luisa Ramos
- Centro de Química, Department of Chemistry, University of Coimbra, 3004-535 Coimbra, Portugal.
| | - Artur J M Valente
- Centro de Química, Department of Chemistry, University of Coimbra, 3004-535 Coimbra, Portugal.
| | - Beverly Stewart
- Centro de Química, Department of Chemistry, University of Coimbra, 3004-535 Coimbra, Portugal.
| | - Licinia L G Justino
- Centro de Química, Department of Chemistry, University of Coimbra, 3004-535 Coimbra, Portugal.
| | - Aline I A Almeida
- Centro de Química, Department of Chemistry, University of Coimbra, 3004-535 Coimbra, Portugal.
| | - Nathanny Lessa Catarina
- Centro de Química, Department of Chemistry, University of Coimbra, 3004-535 Coimbra, Portugal.
| | - Ricardo Mallavia
- Instituto de Biología Molecular y Celular, Universidad Miguel Hernandez de Elche, Avda. de la Universidad s/n, 03202 Elche, Spain
| | - Matti Knaapila
- Department of Physics, Technical University of Denmark, 2800 Kgs. Lyngby, Denmark
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