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Soares da Silva J, Machado TR, Martins TA, Assis M, Foggi CC, Macedo NG, Beltrán-Mir H, Cordoncillo E, Andrés J, Longo E. α-AgVO 3 Decorated by Hydroxyapatite (Ca 10(PO 4) 6(OH) 2): Tuning Its Photoluminescence Emissions and Bactericidal Activity. Inorg Chem 2019; 58:5900-5913. [PMID: 31012582 DOI: 10.1021/acs.inorgchem.9b00249] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
Abstract
Defect-related luminescent materials have attracted interest because of their excellent optical properties and are considered as a less expensive and nontoxic alternative to commonly used lanthanide-based optical systems. These materials are fundamentally and technologically important for the next generation of full-color tunable light-emitting diodes as well as in the biomedical field. In this study, we report the preparation of α-silver vanadate (α-AgVO3, AV) decorated by hydroxyapatite (Ca10(PO4)6(OH)2, HA) with intense photoluminescence (PL) emissions at various HA/AV molar ratios (1:1-1:1/32) by a simple route based on chemical precipitation. The well-defined diffraction peaks observed by X-ray diffraction were all indexed to the monoclinic AV and hexagonal HA phases. Analysis of the results obtained by Fourier transform infrared spectroscopy reveals the presence of short-range structural order as deduced by the characteristic vibrational modes assigned to AV and HA systems. Characterization by scanning and transmission electron microscopies confirms the presence of AV and HA micro- and nanorods, respectively. UV-vis spectroscopy renders band gap energies of 5.80 eV for HA and in the range 2.59-2.65 eV for pure AV and HA/AV samples. The PL data reveal the presence of broad-band emission profiles, typical of defect-related optical centers in materials. Depending on the molar ratio, the emission can be completely tunable from the blue to red spectral regions; in addition, pure white color emission was obtained. On the basis of these results, we propose an order-disorder model induced by structural and interface defects to explain the PL emissions in the HA/AV system. Moreover, our results show that HA/AV composites have superior bactericidal activity against Staphylococcus aureus (methicillin-resistant and methicillin-susceptible) and can be used as a novel multifunctional material.
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Affiliation(s)
- Jussara Soares da Silva
- Departamento de Química , CDMF, Universidade Federal de São Carlos (UFSCar) , 13565-905 São Carlos , São Paulo , Brazil
| | - Thales R Machado
- Departamento de Química , CDMF, Universidade Federal de São Carlos (UFSCar) , 13565-905 São Carlos , São Paulo , Brazil
| | - Tiago A Martins
- Departamento de Química , CDMF, Universidade Federal de São Carlos (UFSCar) , 13565-905 São Carlos , São Paulo , Brazil
| | - Marcelo Assis
- Departamento de Química , CDMF, Universidade Federal de São Carlos (UFSCar) , 13565-905 São Carlos , São Paulo , Brazil
| | - Camila C Foggi
- Departamento de Química , CDMF, Universidade Federal de São Carlos (UFSCar) , 13565-905 São Carlos , São Paulo , Brazil
| | - Nadia G Macedo
- Departamento de Química , CDMF, Universidade Federal de São Carlos (UFSCar) , 13565-905 São Carlos , São Paulo , Brazil
| | - Héctor Beltrán-Mir
- Departament de Química Inorgànica i Orgànica , Universitat Jaume I (UJI) , 12071 Castellón de la Plana , Castelló , Spain
| | - Eloisa Cordoncillo
- Departament de Química Inorgànica i Orgànica , Universitat Jaume I (UJI) , 12071 Castellón de la Plana , Castelló , Spain
| | - Juan Andrés
- Departament de Química Física i Analítica , Universitat Jaume I (UJI) , 12071 Castellón de la Plana , Castelló , Spain
| | - Elson Longo
- Departamento de Química , CDMF, Universidade Federal de São Carlos (UFSCar) , 13565-905 São Carlos , São Paulo , Brazil
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Zanocco RP, Valdebenito S, Gidi Y, Zapata-Torres G, Lemp E, Nonell S, Zanocco AL. Intense White Molecular Fluorescence from Naphthoxazole-Quinoline Derivatives. Photochem Photobiol 2018; 94:1092-1099. [PMID: 29964295 DOI: 10.1111/php.12970] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/15/2018] [Accepted: 06/15/2018] [Indexed: 01/31/2023]
Abstract
Naphthoxazole derivatives are small heterocyclic compounds endowed with outstanding fluorescence properties. In this work, we report a detailed study of the intense white light fluorescence observed in naphthoxazole-quinoline dyads in solvent mixtures including at least a strong hydrogen bonding solvent. The same phenomenon was also studied in inclusion complexes naphthoxazole derivatives-sulfonated-βCD either in aqueous solution as well as in solid phase. A novel mechanism of white molecular fluorescence generation based on solvent-to-fluorophore proton transfer facilitated by ground state hydrogen bonding was characterized. The emission combines both, a blue charge transfer fluorescence emitted by the locally excited singlet state along with a red-shifted emission from a proton transfer complex.
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Affiliation(s)
- Renzo P Zanocco
- Departamento de Química Orgánica y Fisicoquímica, Facultad de Ciencias Químicas y Farmacéuticas, Universidad de Chile, Santiago, Chile
| | - Silvana Valdebenito
- Departamento de Química Orgánica y Fisicoquímica, Facultad de Ciencias Químicas y Farmacéuticas, Universidad de Chile, Santiago, Chile
| | - Yasser Gidi
- Departamento de Química Orgánica y Fisicoquímica, Facultad de Ciencias Químicas y Farmacéuticas, Universidad de Chile, Santiago, Chile
| | - Gerald Zapata-Torres
- Departamento de Química Inorgánica y Analítica, Facultad de Ciencias Químicas y Farmacéuticas, Universidad de Chile, Santiago, Chile
| | - Else Lemp
- Departamento de Química Orgánica y Fisicoquímica, Facultad de Ciencias Químicas y Farmacéuticas, Universidad de Chile, Santiago, Chile
| | - Santi Nonell
- Institut Químic de Sarrià, Universitat Ramon Llull, Barcelona, Spain
| | - Antonio L Zanocco
- Departamento de Química Orgánica y Fisicoquímica, Facultad de Ciencias Químicas y Farmacéuticas, Universidad de Chile, Santiago, Chile
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Abstract
Potential applications of excimer states in organic electronics such as sun-like emission of light are presented in this article.
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Affiliation(s)
- Joachim Vollbrecht
- Department of Chemistry
- University of Paderborn
- Paderborn
- Germany
- Center for Optoelectronics and Photonics Paderborn
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