Synthesis, thermal, spectroscopic and structural properties of di(aqua)bis(N,N'-dimethylethylenediamine-k2N,N')copper(II) acesulfamate

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) angstrom, 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.