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Thermal analysis of dithiomalonamide complexes

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Abstract

Dithiomalonamide [H2A, CH2(CSNH2)2] and 2,2-dimethyldithiomalonamide [H2B, C(CH3)2(CSNH2)2] can act as bidentate ligands and form stable, cationic 1∶2 complexes with general formula M2(H2L)2X2 [M=Ni2+, Pd2+, Pt2+;X=C1, 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 counterions are investigated.

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Authors and Affiliations

  1. Department of Chemistry, RUCA, Groenenborgerlaan 171, B-2020, Antwerp, Belgium

    Sabrina H. J. De Beukeleer & H. O. Desseyn

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  1. Sabrina H. J. De Beukeleer
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  2. H. O. Desseyn
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Additional information

Sabrina H. J. De Beukeleer wishes to thank the N.F.W.O. for a grant. The authors are very grateful to Prof. Dr. A. Fabretti for the elemental analyses, to Ing. J. Janssens for the TG/DTA measurements and to Prof. Dr. J. Mullens for the results from TG-MS. The N.F.W.O. is also thanked for the financial support towards the spectroscopic and thermal equipment.

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De Beukeleer, S.H.J., Desseyn, H.O. Thermal analysis of dithiomalonamide complexes. Journal of Thermal Analysis 47, 135–142 (1996). https://doi.org/10.1007/BF01982693

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