Homoconjugation in 5-(9-Anthryl)-3- (4-Nitrophenyl)-1-Phenyl-2-Pyrazoline

doi:10.7517/j.issn.1674-0475.2004.03.224

Abstract

Abstract: The UV-Vis spectra of 5-(9-anthryl)-3-(4-nitrophenyl)-1-phenyl-2-pyrazoline(ANPP) and its derivatives were compared.It was found that strong hypsochromical effect exists in "Ar-N-N=C-Ar" chromophore and bathochromic effect in anthryl group in ANPP.Computational studies demonstrated twisting between the two chromphores.It implies these effects are resulted by intramolecular homoconjugation.This finding will help explaining the unconjugated charge transfer between the two groups in the excited state and provide a new method to increase absorption coefficient of 1,3,5-triarylpyrazoline compounds.

Key words: pyrazoline, absorption spectrum, homoconjugation

CLC Number:

WANG Ming-liang, LIU Ju-zheng. Homoconjugation in 5-(9-Anthryl)-3- (4-Nitrophenyl)-1-Phenyl-2-Pyrazoline[J]. Imaging Science and Photochemistry, 2004, 22(3): 224-228.

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