The Triplet States of 1,3,5-Tricyanobenzene Complexes with Methyl Substituted Benzenes
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概要
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Triplet-triplet absorption, phosphorescence, and ESR spectra have been measured on the 1,3,5-tricyanobenzene complexes with toluene, mesitylene, durene, and hexamethylbenzene. Four triplet-triplet absorption bands were commonly observed in the wave number region of 10000–30000 cm<SUP>−1</SUP> for all the complexes. The observed phosphorescence and T-T absorption spectra could be understood systematically by considering the interaction among zero-order charge-transfer triplet states and zero-order locally (within the acceptor) excited triplet states. From an analysis of the zero-field splitting values obtained from the observed ESR spectra, the contribution of the zero-order charge-transfer triplet state to the lowest triplet state was determined to be 76,65,25, and 9% for the 1,3,5-tricyanobenzene complexes with hexamethylbenzene, durene, mesitylene, and toluene, respectively. From the consideration on the results obtained for various polycyanobenzene complexes, the phosphorescence lifetime was found to decrease remarkably for the complexes with the charge-transfer character higher than 50% in their lowest triplet states.
- 公益社団法人 日本化学会の論文
著者
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HAYASHI Hisaharu
The Institute of Physical and Chemical Research
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NAKAMURA Junko
The Institute of Physical and Chemical Research
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Nagakura Saburo
The Institute for Molecular Science
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Shimozato Yasuyuki
The Institute of Physical and Chemical Research
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Matsumoto Satoru
The Institute for Solid State Physics, The University of Tokyo
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