Thermal decomposition of 4,6-diamino-1,2-dihydro-2-thiopyrimidine and its complexes with CoII CoIII, NiII and CuII ions

Thermal properties of some CoII, NiII and CuII complexes of new substituted pyrimidine compounds

“…The nature of the remaining residues was reported and identified by IR spectroscopy [27]. Likewise, if relatively stable intermediates in the pyrolytic process can be isolated, their chemical nature and the mechanism of thermal degradation of the compound, may be inferred by means of other techniques, such as, IR and UV-visible-near-IR spectra and magnetic measurements [28,29]. Tables 4 and 5.…”

“…The TGA studies permit coordinated and uncoordinated solvate molecules, such as water or ammonia, to be distinguished [31]. Type Also, dehalogenation and decarboxylation processes may be detected and their enthalpies calculated [28,29], for examples, the Ni 2 -L 1 and Cu-L 2 complexes of the formula [Ni 2 (HL 1 )(NH 3 )Á3OH À ] and [Cu(H 2 L 2 )(OH À )(H 2 O)], respectively. The former complex gave a well defined broad peak on the DTA curve, Table 4, with a maximum at 373 K and a loss in weight of 11.64% which can respond to the elimination of two H 2 O and one coordinated NH 3 molecules [7] that is in accordance with the elemental analyses.…”