Fluorescent tetraruthenated porphyrins embedded in monolithic SiO2 gels by the sol-gel process.
J Colloid Interface Sci
; 305(2): 264-9, 2007 Jan 15.
Article
en En
| MEDLINE
| ID: mdl-17074358
In this work silica gels have been prepared by a sol-gel method using tetraethylorthosilicate as gel precursor. The tetraruthenated porphyrins H2(3-TRPyP), Co(3-TRPyP), and H2(4-TRPyP) were incorporated into the systems during gel formation without problems commonly found in the process, such as aggregation. Spectroscopic studies of the resulting silica gels revealed the presence of absorption bands in the range 200-400 nm associated with the transitions of the groups ruthenium-bipyridine, along with the Soret band at the same wavelengths observed in solution. The porphyrins were found to preserve fluorescence emission properties in the range 650-700 nm even after the aging period. Study of the thermal behavior and decomposition kinetics evidenced that the porphyrin H2(4-TRPyP) is the least stable of the group and that all compounds decompose according to first-order kinetics.
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Colección:
01-internacional
Base de datos:
MEDLINE
Asunto principal:
Compuestos Organometálicos
/
Porfirinas
/
Dióxido de Silicio
/
Nanotecnología
/
Transición de Fase
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Fluorescencia
/
Geles
Idioma:
En
Revista:
J Colloid Interface Sci
Año:
2007
Tipo del documento:
Article
País de afiliación:
Brasil
Pais de publicación:
Estados Unidos