Effect of some substitutions and solvents on the electronic spectra of some mono and di-derivatives of pyridine

Department of Physics, University of Gorakhpur, Gorakhpur-273001, India. Central Forensic Science Laboratory, Central Bureau of Investigation, New Delhi-22, India.

Abstract

The ultraviolet spectra of some mono and di-derivatives of pyridine have been measured and examined. The frequency shifts of the [math]

transitions, relative to benzene, have lA→1Lb been found to obey the Forster formula :

[math]

assuming the aza-nitrogen behaving as negative substituent. Effets of substitutions and solvents on the n → π transition have also been explored.

Résumé

Enregistrement, et étude des spectres UV de pyridines mono- et di-substituées. Les déplacements dus aux transitions benzéniques [math] obéissent à la relation de Forster

[math]

si l'on considère l’azote cyclique comme un substituant négatif. On examine aussi les effets de substitution et de solvants sur la transition n → π.