Original scientific paper

Spectroscopic Studies on 4-(p-Dimethylaminobenzylidene) and 4-(p- Dimethylaminophenylimino) Derivatives of 3-Methyl-1-phenyl-2-pyrazolin-5-one

Anwar S. EI-Shahawy ; Chemistry Department, Faculty of Sciences, Assiut University, Assiut, P. O. Box 107 Egypt
Maher M. Girgis ; Chemistry Department, Faculty of Sciences, Assiut University, Assiut, P. O. Box 107 Egypt
Zarit H. Khalil ; Chemistry Department, Faculty of Sciences, Assiut University, Assiut, P. O. Box 107 Egypt

Abstract

The electronic absorption spectra of 4-(p-dimethylaminobenzylidene)
and 4-(p-dimethylaminophenylimino) derivatives of 3-methyl-1-phenyl-2-pyrazolin-5-one were studied in polar and nonpolar solvents. HMO and PPP calculations were done to investigate the first n_n* transition and the effect of replacing the backbone carbon atom C-13 in 4-p dimethylaminobenzylidene-3-methyl-I-phenyl-2-pyrazolin-5-one by a nitrogen atom. The electron densities of these compounds were calculated by the SCF-method.

Keywords

Hrčak ID:

176388

URI

https://hrcak.srce.hr/176388

Publication date:

23.12.1987.

Visits: 804 *