Polarities of Sol−Gel-Derived Ormosils and of Their Interfaces with Solvents
2001; American Chemical Society; Volume: 13; Issue: 10 Linguagem: Inglês
10.1021/cm001238p
ISSN1520-5002
AutoresClaudio Rottman, Gideon S. Grader, David Avnir,
Tópico(s)Porphyrin and Phthalocyanine Chemistry
ResumoThe effective polarities of a series of organically modified sol−gel silicas and of their interfaces were probed using the solvatochromic dye ET(30) (2,6-diphenyl-4-(2,4,6-triphenyl-N-pyridino)phenolate). The series of materials was obtained by copolymerizing, in various proportions, of methyltrimethoxy-, vinyltrimethoxy-, propyltrimethoxy-, isobutyltrimethoxy- and phenyltrimethoxysilanes with tetramethoxysilane. The various doped Ormosils are solvatochromic toward organic solvents such as various alcohols and toluene. Trends in the polarity variation as a function of the monomer type, of its proportion, and of the solvent at the interface were identified and are discussed. These materials can be used as solvent sensors.
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