Synthesis and EPR characterization of a series of 2,2 '-diamino-4,4 '-bithiazole and 2,2 '-bis(acetamido)-4,4 '-bithiazole copper(II) complexes

Copper(II) complexes of the formula CuLX2, (L = 2,2'-diamino-4,4'-bithiazol e or 2,2'-bisacetamido-4,4'-bithiazole, X = Cl, Br, NO3, 1/2SO(4)), were pr epared and characterized by elemental and thermogravimetric analyses, IR, e lectronic and EPR spectroscopy. In all of the prepared compounds the ligand s act in a bidentate fashion through the nitrogen atoms of the thiazole rin gs. The electronic and EPR spectral data show that the complexes have a tet rahedral distorted structure, except for the [CuLCl2](2) (L = 2,2'-bisaceta mido-4,4'0bithiazole) complex. This dimeric complex presents two bridging c hloride groups between the two non-equivalent Cu(II) ions.