The Electronic Transitions and Spectra
of Hetarylphenanthroimidazole Derivatives

A. D. Roshal’¹, B. S. Luk’yanov², and M. M. El’chaninov³

¹ Research Institute of Chemistry, Kharkov National University, Kharkov, Ukraine

² Institute of Physical and Organic Chemistry, Rostov State University, Rostov-on-Don, Russia

³ South Russia State Technical University, Novocherkassk, Russia

E-mail: Alexandre.D.Rochal@univer.kharkov.ua

Received December 27, 2002

Abstract—The spectral properties of hetarylphenanthroimidazole derivatives were studied. The results of
quantum-chemical calculations and experimental data were used to draw conclusions about the nature of
absorption and fluorescence spectrum bands. All compounds were divided into two groups depending on the
type of substituents in the hetaryl ring. The S₀ S₁ and S₁ S₀ transitions in compounds of the first group,
which contained methyl and phenyl substituents, were localized in the phenanthroimidazole fragment. Similar
transitions in compounds of the second group, which contained electron-acceptor substituents such as formyl
and acetyl, were charge transfer transitions from the oxohetaryl to the phenanthroimidazole fragment. Com-
pounds of the second group possess high sensitivity to environment parameters and can be used as biological
probes for medium polarity.

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