Time-resolved EPR and ODMR studies on the lowest excited triplet states of α-silyl and α-germyl ketones

Autor:	Kunio Mochida, Seigo Yamauchi, Masamoto Iwaizumi, Masahiro Mukai, Noboru Hirota, Masanobu Wakasa, Minoru Hanaya, Islam S. M. Saiful
Rok vydání:	2001
Předmět:	education.field_of_study Silylation Chemistry Population Biophysics Condensed Matter Physics law.invention Delocalized electron law Excited state Molecule Physical and Theoretical Chemistry Atomic physics education Spectroscopy Electron paramagnetic resonance Molecular Biology
Zdroj:	Molecular Physics. 99:1183-1192
ISSN:	1362-3028 0026-8976
Popis:	Sublevel properties of the lowest excited triplet (T1) npstates of ¬-silyl and ¬-germyl ketones were examined by means of ODMR, time-resolved EPR and optical spectroscopy. The EPR parameters, D, E and g, population ratios, and triplet lifetimes were obtained. The D value and the triplet lifetime varied among the molecules. In contrast the E value and population ratio remains nearly the same. These properties together with their solvent dependence and emission properties are interpreted in terms of spin± orbit couplings between T1 (np ¤ ) and higher S1 (np ¤ ), T2 (pp ¤ ) and S2 (pp ¤ ) states. An origin of the remarkable red-shifts of 1;3 (np ¤ ) are discussed based on a model of delocalized n, p and pelectrons over the Si and Ge atoms. This model is also consistent with all the triplet properties obtained.
Databáze:	OpenAIRE
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