CD(2,2'-BIPYRIDINE-N,N')NI(CN)4, A HIGHLY BENT CLOSE 2-DIMENSIONAL NETWORK OF [CD-((NC)NI1/4)4]N

The crystal structure of poly[(2,2'-bipyridine-N,N')cadmium(II) tetra-mu-cyanonickelate(II)], [Cd(CoH8N2)][Ni(CN)4], has been determined. The tetracyanonickelate(II) ion, Ni(CN)42-, bridges four Cd+ ions to form an infinite two-dimensional folded network stacking along the b axis. The 2,2'-bipyridine ligands chelate to the Cd atoms alternately above and below the folded network. The distortion about the octahedrally coordinated Cd atom is so large, as a result of the unusual coordination behaviour of the Ni(CN)4 in the network formation, that one of the Cd-N-C angles is markedly bent [143.1 (3)-degrees].