Polarized Absorption Spectra of Single Crystals of Ion Radical Salts. III. Temperature Dependence of the Crystal Spectra of Potassium-Chloranil
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概要
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The polarized absorption spectra in the 10000–37000 cm<SUP>−1</SUP> region were observed on the single crystal of the water-free modification of the potassium-chloranil salt, K<SUP>+</SUP>·(chloranil)<SUP>−</SUP>, by using a microspectrophotomer, and the variation of the spectra with temperature was examined. The crystal gives a near-infrared absorption band associated with the charge transfer between chloranil radical anions, the maximum of which is located at 11.5×10<SUP>3</SUP> cm<SUP>−1</SUP>. The absorption bands in the 20000–37000 cm<SUP>−1</SUP> region were assigned to the local-excitation bands associated with the transitions in the chloranil anion. The intensity of the charge-transfer band gradually increases on lowering the temperature. An abrupt increase of intensity occurrs in the charge-transfer band at the phase-transition point. There is a close correlation between this change and the temperature dependence of the paramagnetic susceptibility of the salt.
- 公益社団法人 日本化学会の論文
著者
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Kuroda Haruo
Department of Chemistry and Research Center for Spectrochemistry, Faculty of Science, The University of Tokyo
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Hiroma Shoji
Department of Chemistry, Faculty of Science, The University of Tokyo
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