Photochemistry of Nonconjugated Bichromophoric Systems (Ⅱ)──Photocyclization Reaction and Fluorescence Spectra Studies of Long Chain Biscoumarins

Chem. J. Chinese Universities ›› 1996, Vol. 17 ›› Issue (7): 1074.

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Photochemistry of Nonconjugated Bichromophoric Systems (Ⅱ)──Photocyclization Reaction and Fluorescence Spectra Studies of Long Chain Biscoumarins

DU Da-Ming¹, WANG Yong-Mei¹, MENG Ji-Ben¹, ZHOU Xiu-Zhong¹, WANG Guo-Chang², LIANG Li-Jun², GAO Huan²

1. Department of Chemistry, Nankai University, Tianjin 300071;
2. State Laboratory of Functional Polymtr Materials for Adsorption and Separation, Institute of Polymer Chemistry, Nankai University

Received:1995-06-21 Online:1996-07-24 Published:1996-07-24

Abstract

Abstract: Aseries of polymethylene bis(4-methyl-7-coumarinyl)oxyacetates have been synthesized and their photochemical reaction and fluorescence spectra have been studied.It was found that only intramolecular photocyclization products were obtained when polymethylene bis(4-methyl-7-coumarinyl)oxyacetates were directly irradiated in chloroform.The yields of the products decreased with the increase of methylene chain lengths, and this result accords with the phenomena found in the fluorescence spectra,i.e.,the relative fluorescence intensity increased with the increase of methylene chain length.

Key words: Synthesis, photocyclization, Fluorescence spectra, Coumarin

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DU Da-Ming, WANG Yong-Mei, MENG Ji-Ben, ZHOU Xiu-Zhong, WANG Guo-Chang, LIANG Li-Jun, GAO Huan. Photochemistry of Nonconjugated Bichromophoric Systems (Ⅱ)──Photocyclization Reaction and Fluorescence Spectra Studies of Long Chain Biscoumarins[J]. Chem. J. Chinese Universities, 1996, 17(7): 1074.

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Photochemistry of Nonconjugated Bichromophoric Systems (Ⅱ)──Photocyclization Reaction and Fluorescence Spectra Studies of Long Chain Biscoumarins

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