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KMID : 1059519940380120864
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Journal of the Korean Chemical Society
1994 Volume.38 No. 12 p.864 ~ p.872
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Thermochromism of Spiropyran and Spirooxazine Derivatives
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Lee Yoon-Sang
Kim Jong-Gyu
Huh Young-Duk
Kim Myoung-Kun
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Abstract
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Absorption spectra of thermochromic spiropyran and spirooxazine derivatives were investigated. The effects of solvent polarity on the absorption spectra indicate that the merocyanine-like form of non-substituted spiro compound is likely to the quinoid type. However, the merocyanine-like form of electron-withdrawing substituted spiro compound is likely to the zwitter-ion type. The enthalpy changes between the closed and merocyanine-like forms were measured. The enthalpy change of spiro compound decreases as the solvent polarity increases. The UV-Vis spectrum of merocyanine-like form was resolved into three Lorentzian-Gaussian product bands. The solvent dependence of the amount of the three band was also examined.
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