Topochemically controlled solid state photoreaction in 7-acetoxy coumarin: A Raman phonon spectroscopic study

被引：13

作者：

Ghosh, M ^{[1
]}

Chakrabarti, S ^{[1
]}

Misra, TN ^{[1
]}

机构：

[1] INDIAN ASSOC CULTIVAT SCI,DEPT SPECT,CALCUTTA 700032,W BENGAL,INDIA

来源：

JOURNAL OF PHYSICS AND CHEMISTRY OF SOLIDS | 1996年 / 57卷 / 12期

关键词：

organic materials; Raman spectroscopy; infrared spectroscopy; phonons;

D O I：

10.1016/S0022-3697(96)00077-7

中图分类号：

O6 [化学];

学科分类号：

0703 ;

摘要：

The solid state photodimerization reaction mechanism in 7-acetoxy coumarin (7AC) crystal has been investigated. Raman phonon spectroscopic studies reveal that the reaction mechanism is homogeneous and the lattice becomes disordered with the increase of product concentration. No mode softening is observed. Electronic excitation and emission spectra show that exciton-phonon coupling is weak in the monomer crystal. Thus the reaction seems to be topochemically controlled and lattice phonons do not take part in the reaction. Formation of cyclobutane rings through the > C=C < of the pyrone moiety is established by infrared and Raman spectroscopy.

引用

页码：1891 / 1895

页数：5

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