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The influence of intermolecular hydrogen bonding on some physical constants is clearly shown by comparing some thermal data for simple oxamides and thiooxamides.

Dithiomaionamide [H2A, CH2(CSNH~):I and 2,2-dimethyldithiomalonamide [H2B, C(CH3)2(CSNH:)2] can act as bidentate ligands and form stable, cationic 1:2 complexes with general formula M2(H2L)2X2 [M=Ni 2+, Pd 2+, Pt2+; X=CI, Br, I; H2L=H2A, H2B] in strong acidic medium. An elaborate thermal study is presented, based on results from elemental analyses and vibrational studies (IR and Raman spectroscopy). The H2A complexes start to decompose by releasing two HX molecules whereafter a stable intermediate M(HA)2 is formed. The H2B complexes degrade in a different way; the metal-sulphur bond is broken and the ligand is expelled as a whole. Influences of the metal ion and of the halogenide eounterions are investigated.

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