Affordable Access

Publisher Website

Solvatochromaticity and pH dependence of the electronic absorption spectra of some purines and pyrimidines and their metal complexes

Authors
Journal
Spectrochimica Acta Part A Molecular and Biomolecular Spectroscopy
1386-1425
Publisher
Elsevier
Publication Date
Volume
79
Issue
3
Identifiers
DOI: 10.1016/j.saa.2011.03.029
Keywords
  • Uric
  • 6-Amino-2-Thiouracil
  • Complexes
  • Solvatochromic
  • Dissociation Constants
  • Ph-Effect

Abstract

Abstract The solvatochromic responses of uric acid (Ua), 6-amino-2-thiouracil (ATU) and a series of their complexes dissolved in ten solvents of different polarity have been measured. The solvent-dependent UV/Vis spectroscopic absorption maxima, λ max, are assigned to the corresponding electronic transitions and analyzed using SPSS program, regression analysis and Kamlet and Taft methods. The observed solvatochromism is discussed using various solute–solvent interaction mechanisms. The electronic absorption spectra of ATU were investigated in aqueous buffer solutions of varying pH and utilized for the determination of dissociation constants. The ranges of pH, where individual ionic species are predominant have been determined.

There are no comments yet on this publication. Be the first to share your thoughts.