Spectroscopic studies of photochemical reactions in organic solids. Photodimerization of p-formylcinnamic acid.
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概要
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Raman phonon spectroscopy and electronic absorption and emission spectroscopy have been used to study the mechanism of reaction and the role of electron–phonon coupling in determining the photoreactivity of <I>p</I>-formylcinnamic acid (<I>p</I>-FCA) in the crystalline state. Raman and infrared spectroscopy in the internal vibration region have been used to characterize the reactant <I>p</I>-FCA and the dimeric product <I>t</I>-3,<I>t</I>-4-bis(<I>p</I>-formylphenyl)-ν-1,<I>c</I>-2-cyclobutanedicarboxylic acid. Phonon spectroscopy reveals that the reaction proceeds principally by a heterogeneous mechanism though a homogeneous mechanism in the initial stage of short time domain can not be ruled out. The electronic spectroscopy suggests a strong electron–phonon coupling in the monomer crystal.
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