Spectroscopic, magnetic, and structural properties of diaquadimethanolbis-(N-tosylvalinato)copper(II) and its 2,2'-bipyridine adduct

Binary copper(II) compounds of N-tosylvalinate of formula [Cu(tsvalO)2(H2O)2]4H2O and [Cu(tsvalO)2(H2O)2(MeOH)2] were separated. The structure of the latter consists of discrete [Cu(tsvalO)2(H2O)2(MeOH)2] units in which the copper ion, lying on the symmetry centre, is surrounded by two carboxylic oxygens and two water molecules centrosymmetrically related. Two methanol molecules complete the co-ordination which is elongated tetragonal bipyramidal. The spectroscopic properties are consistent with a CuO6 chromophore. (...)