Polymere Dimethyl-und Diphenylglyoximatokomplexe des Cobalts und Eisens mit 4.4′ -Bipyridin als Brückenligand. Die Kristallstruktur des Bis(dimethylglyoximato)4.4′-bipyridincobalt(II)*/ Polymeric Dimethyl-and Diphenylglyoximato Complexes of Cobalt and Iron with 4,4′-Bipyridine as a Bridging Ligand. The Crystal Structure of Bis(dimethylglyoximato)4,4′-bipyridine Cobalt(II)

Polymeric bis(dimethyl- and diphenylglyoximato)-complexes of Fe(II) and Co(II) with 4,4′-bipyridine as a bridging ligand have been synthesized from the glyoximato metal complexes and 4,4′-bipyridine in ethanol. The Co(II) compounds are paramagnetic and surprisingly stable against oxidation. The iron complexes are weak electrical conductors with approximately 10-9 Ω-1cm-1 . Bis(dimethylglyoximato)-4,4′-bipyridine cobalt(II) crystallizes triclinic in the space group PT with Z=1. The crystal structure is built up by linear chains of alternating Co(II) glyoximato complexes and axial bonded 4,4′-bipyridine bridges. The compound is characterized by strong Co-N-bonds of 189 pm within the glyoximato moiety and weak bonds of 228 pm to the bipyridine ligand. The two heterocycles of the bipyridine are coplanar, therefore the local symmetry of the complex is D2h.