The <I>n</I>-π<SUP>*</SUP> Absorption and Phosphorescnce of Terephthalaldehyde
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概要
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The <I>n</I>→π<SUP>*</SUP> absorption spectrum of terephthalaldehyde (TPA) has been studied. The <I>f</I><SUB><I>n</I>→π<SUP>*</SUP></SUB>-value observed in cyclohexane at room temperature was 1.3×10<SUP>−3</SUP>, which was 2.4 times that of benzaldehyde (BA). Vibrational analyses of the absorption and phosphorescence spectra of TPA indicate that the CHO-torsional, CHO-wagging, aldehyde H-wagging, and out-of-plane ring deformation vibrations are important in the vibronic perturbation between (<I>n</I>,π<SUP>*</SUP>) and (π,π<SUP>*</SUP>) states. The spectral structures and the results of CNDO computations of the <I>f</I><SUB><I>n</I>→π<SUP>*</SUP></SUB>-values of the <I>n</I>→π<SUP>*</SUP> absorptions of TPA and BA suggest that the intensity enhancement in the TPA absorption is due to an increase in the vibronic perturbation between (<I>n</I>,π<SUP>*</SUP>) and (π,π<SUP>*</SUP>) states as well as to an increase in the electronically-allowed character in TPA in comparison with that in BA.
- 公益社団法人 日本化学会の論文
著者
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SHIMADA Ryoichi
Department of Electronics, Faculty of Technology, Fukuoka Institute of Technology
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Murakami Yoshio
Department of Chemistry Faculty of Science Kyushu University
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Kanda Yoshiya
Department of Chemistry, Faculty of Science, Kyushu University
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Kanda Yoshiya
Department of Chemistry� Faculty of Science, Kyushu University
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Murakami Yoshio
Department of Chemistry� Faculty of Science, Kyushu University
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