Abstract
The carbonyl stretching frequencies in the infrared spectra of the complexes M(Hbarb)2L2, M(Hbarb.)2 and M(11) (barb.) or (M(1)2 (barb.) (M=Mn(11), Co(11), Ni(11), Cu(11), Zn(11), Ag(1), Cd(11), Hg(11), Hg-phenyl, Pb(11); Hbarb. = anion of 5,5-disubstituted barbituric acid; barb dianion of 5,5-disubstituted barbituric acid; L = imidazole, isobutylamine, pyridine) are assigned and discussed. Structures are proposed for some complexes not described before. The generally accepted interpretations of the carbonyl region of barbituric acids are discussed in relation to the spectra of the complexes.