Crystal structure of bis(isocyanato)(2,2′:6′,2″-terpyridyl)cobalt(II) : stereochemistry of [M(tridentate ligand)(unidentate ligand)2]complexes

Abstract

The title compound, [Co(terpy)(NCO)₂], has been synthesized and its crystal structure determined by single-crystal X-ray diffraction methods, being refined to a residual of 0.048 for 715 ‘observed’ reflections. Crystals are monoclinic, space group C2/c, with a= 16.351(6), b= 9.202(3), c= 13.048(4)Å, β= 124.70(3), and Z= 4. The molecule containing five-co-ordinate cobalt(II)has internal crystallographically imposed 2 symmetry: Co–N(terpy) 1.949(4), 2.146(7); Co–N(NCO) 2.058(6)Å. The co-ordination geometry about the metal atom is examined in terms of a repulsion model.