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Thermal analysis of oxathioamidate complexes

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Abstract

Oxathioamidates (CSNR1 R 2COOKR 1=R 2=H (A),R 1=H andR 2=CH3 (B),R 1,=R 2=CH3 (C)) can act as O, S donors and form pentaatomic ring systems with divalent metals (M(II)=Mn, Fe, Co, Ni, Cu, Zn). Vibrational spectra and thermal analysis provide information on the amount and nature of associated water molecules. The dehydration of MA2(H2O)2 (M=Mn, Fe, Co, Ni) can be very well explained by the C.F.S.E. (crystal field stabilization energy) for weak field octahedral complexes. The complexes with ligand A and B decompose to form polymers by deprotonation on the thioamide group. The proposed structures are confirmed by the vibrational spectra. For ligand C no stable intermediates are formed during heating, degradation proceeds until metal sulphide remains.

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Authors and Affiliations

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

    Marleen L. B. F. Hereygers & H. O. Desseyn

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  1. Marleen L. B. F. Hereygers
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  2. H. O. Desseyn
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The N.F.W.O. is thanked for the financial support towards the spectroscopic and thermal equipment. The authors are very grateful to Ing. J. Janssens for the TG/DTA measurements.

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Hereygers, M.L.B.F., Desseyn, H.O. Thermal analysis of oxathioamidate complexes. Journal of Thermal Analysis 47, 143–150 (1996). https://doi.org/10.1007/BF01982694

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