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Spectrophotometric Studies on Some Arylazo Barbituric Acids and Arylazo Pyrimidine in Organic Solvents and in Buffer Solutions
Author(s) -
Amrallah A. H.,
Abdalla N. A.,
ElHaty E. Y.
Publication year - 2007
Publication title -
journal of the chinese chemical society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.329
H-Index - 45
eISSN - 2192-6549
pISSN - 0009-4536
DOI - 10.1002/jccs.200700230
Subject(s) - chemistry , barbituric acid , tautomer , intermolecular force , pyrimidine , ionization , absorption spectroscopy , organic chemistry , molecule , stereochemistry , ion , physics , quantum mechanics
The UV and visible spectra of some arylazo barbituric acids and arylazo pyrimidine in pure and mixed organic solvents of varying polarities have been studied. The different absorption bands displayed in the electronic spectra of these compounds are assigned and the possibility of the existence of these compounds in tautomeric equilibrium as well as in intra‐ and intermolecular H‐bonding were examined. The solute‐solvents molecular complexes liable to exist in polar‐nonpolar mixed solvents are investigated. The structure of the azo compounds were confirmed by 1 H NMR and IR spectroscopy. The ionization processes of the compounds were investigated and the possible ionization constants were determined and discussed in terms of molecular structure of the azo compounds.