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Interactions of Aza Cyanine Dyes with Adenine: UV-Visible Spectrophotometric Study

Maher M. Girgis ; Chemistry Department, Faculty of Science, Assiut University, Assiut, Egypt
Zarit H. Khalil ; Chemistry Department, Faculty of Science, Assiut University, Assiut, Egypt

Sažetak

UV-Visible absorption studies on the interaction of 2 (4)
pyrid-and 2 (4) quinazamethine cyanine dyes with adenine in
aqueous solutions demonstrate the formation of weakly bonded
charge transfer complexes. The absorption spectra in the visible
region of the complexes formed are located at longer wavelengths
and outside the region of those of the pure reacting individuals.
The amount of the red shift induced depends mainly on the type
of the reacted dye and is independent of the dye concentration on
using a fixed large excess of adenine. Equilibrium constants were
calculated by assuming 1: 1 complexes Various thermodynamic
parameters and molar absorptivities are calculated for the different
interactions. The structure-activity relationships of the interacting molecular species are discussed.

Ključne riječi

Hrčak ID:

176350

URI

https://hrcak.srce.hr/176350

Datum izdavanja:

25.6.1987.

Posjeta: 647 *