resumo
The entrapment of metalloporphyrins (with Zn2+ and Yb3+) in silica microspheres is achieved by modification of protoporphyrin IX (Pp-IX) molecules with three different organosilane precursors via the sol-gel method. The obtained hybrid materials are characterized by electronic absorption spectra, Fourier-transform infrared (FT-IR), X-ray diffraction (XRD), Si-29 MAS NMR spectrum, scanning electron microscopy (SEM), nitrogen adsorption/desorption isotherms and thermogravimetric analysis (TGA), and their luminescence properties have also been determined. The results reveal that the obtained porphyrins networks are covalently bonded to the inorganic matrix through the bridging action of the functionalized silica microspheres. Furthermore, it has also been observed that porphyrins molecules located in different environments exhibit different photophysical properties in the visible and near-infrared regions. (C) 2012 Elsevier Inc. All rights reserved.
palavras-chave
ORGANIC-INORGANIC HYBRIDS; NONLINEAR-OPTICAL PROPERTIES; SENSITIZED SOLAR-CELLS; FLUORESCENCE PROPERTIES; SUBSTITUTED PORPHYRINS; PHOTODYNAMIC THERAPY; PROTOPORPHYRIN-IX; ENERGY-TRANSFER; QUANTUM YIELDS; THIN-FILMS
categoria
Chemistry
autores
Guo, L; Fu, LS; Ferreira, RAS; Carlos, LD; Yan, B
nossos autores
Lianshe Fu
Investigador Auxiliar
Luís Carlos
Professor Catedrático
Maria Rute de Amorim e Sá Ferreira André
Professor Catedráticoagradecimentos
This work was supported by the National Natural Science Foundation of China (20971100), Program for New Century Excellent Talents in University (NCET 2008-08-0398).