The complex [Cu(C4H12N2)2(H2O)2]2+ [(C4H4NO4S)–]2, which is the first structurally characterized complex with acesulfamate as the counter anion, has been synthesized and characterized by elemental analyses, magnetic and conductivity measurements, UV/vis, FT-IR and mass spectra. The thermal behaviour of the complexes was studied by simultaneous TG, DTG and DTA methods in a static air atmosphere. In the crystal structure, the copper cation, lying on a crystallographic centre of symmetry, adopts an elongated octahedral trans-[CuN4O2] coordination geometry, with long axial Cu–O(aqua) bond length and short equatorial Cu–N bonds, of 2.479(2), 2.035(2) and 2.051(2) Å, respectively. The coordinated water molecules together with the amine part of the dimethylethylene diamine molecule link the acesulfamate ions to the metal complex via intermolecular hydrogen bonds.
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