Heterobimetallic copper(II)-tungsten(IV/V) cyanido complexes - structure and magnetic properties

Three complexes with the formulas [{Cu(bpy)2}{WIV(CN)6(bpy)}].2H2O (1), [Cu(NO3)(bpy)2][WV(CN)6(bpy)]. MeCN (2) and [{Cu(dmb)2}{WIV(CN)6(bpy)}].6H2O (3) (where dmb = 4,4 '-dimethyl-2,2 '-bipyridine) were isolated and described. Results of the X-ray crystal structure measurement showed a bimetallic units in structure of 1 with square geometry in the structure. For 1 and 3 the cyanido bridges between tungsten and copper atoms were observed. IR spectra and elemental analyses of 1-3 remained in accordance with the result of the crystal structure analysis. The layered arrangement in complexes was compared to the previously described [W (CN)6(bpy)]- /2- systems. Magnetic data for 1 and 2 show no phase change and a week ferromagnetic interaction between metal ions in structure of 2.