V. K. Ahluwalia, S. Sharma, M. Kaur
1989
Citations
0
Influential Citations
8
Citations
Journal
Spectrochimica Acta Part A: Molecular and Biomolecular Spectroscopy
Abstract
Abstract The vibrational spectra of 1,3-diphenyl-; 1,3-di (4′-chlorophenyl)-; 1,3-di(3′-methoxyphenyl)-1,3-dihydro-2-thioxo-2 H ,5 H -pyrimidine-4,6-diones in solid state (KBr pellet) and in solution (CHCl 3 and CCl 4 ) have been studied and assignments made. Tautomeric and hydrogen bonding behaviour are discussed. Electronic spectra in various solvents at different pH values are recorded. The effect of substituents, change of solvent on the π—π* and n —π* transitions of all the compounds is explained. The bathochromic and hypsochromic shifts observed when the neutral form changes to the cationic or anionic form depending on the pH of solution, are also discussed.