Luminescence-spectral characteristics and structure of 1-hydroxyphenyl-substituted 2,4,6-triphenylpyridinium perchlorates

Autor: M. I. Knyazhanskii, Ya. R. Tymyanskii, L. O. Atovmyan, Oleg A. Dyachenko, G. N. Dorofeenko, S. M. Aldoshin
Rok vydání: 1981
Předmět:
Zdroj: Bulletin of the Academy of Sciences of the USSR Division of Chemical Science. 30:1864-1872
ISSN: 1573-9171
0568-5230
DOI: 10.1007/bf00963410
Popis: 1. A significant difference was found in the luminescence characteristics of 1-(2-hydroxyphenyl)- and 1-(4-hydroxyphenyl)-2,4,6-triphenylpyridinium perchlorates at various temperatures. At 293°K the luminescence of both compounds in the crystalline state and in solutions is fluorescence with an anomalously large Stokes shift; at 77°K it is fluorescence for the second compound and long-lived phosphorescence for the first. 2. Comparison of the luminescence-spectral characteristics of these compounds with their structure and with the luminescence characteristics of model compounds made it possible to attribute the appearance of the anomalously large Stokes shift of the fluorescence to changes in the molecular structure in the excited state, due to flattening of the molecule as a result of rotation of the N-aryl fragment about the N-C bond.
Databáze: OpenAIRE
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