CYANATO-COPPER(II) COMPLEXES WITH ORGANIC-LIGANDS .16. STRUCTURE CHARACTERIZATION OF CYANATO-COPPER(II) COMPLEXES WITH HALOGENOPYRIDINE LIGANDS IN COMPARISON WITH ANALOGOUS METHYL-PYRIDINE COMPLEXES

Cyanatocopper(II)complexesof the type Cu(NCO)2L (L= 2-chloro-or 2-bromopyridine) and Cu(NCO)2L2 (L = 2-chloro-,3-chloro-,3-bromo-,3-iodo-, 4-chloro-,or4-bromopyridine)have been prepared. The resultsof various physical methods show that Cu(NCO)2L complexes have disrtorted five-coordinated structure with N-bridging NCO groups, while Cu(NCO)2L2 complexes, except for Cu(NCO)2-(2-Cl-py)2, display pseudooctahedral structures, probably with axial CuOCN linkages. The complexes of both groups are structurally very similar to one another and the complexes of 3-halogeno-pyridines are even crystal-structurally closely-related. One exception is Cu(NCO)2(2-Cl-py)2,being at room temperature rather unstable and displaying a square pyramidal structure with one N-bridging NCO group. © 1979.