Mixed-Ligand Copper Complexes with Benzoylcyanoxime: Synthesis, Characterization and Structure

Abstract

Procedures for preparing copper(II) complexes with [-ONC(CN)-C(O)C6H5-, BCO] and 2-, 3-, and 4-methylpyridine from metal copper are developed. The complexes are characterized by IR spectroscopy and thermogravimetry; for the complexes [Cu(BCO)2H2O] (1) and [Cu(BCO)2(4-MePy)2] (2), X-ray structural analysis is performed. Complexes 1 and 2 are triclinic (space group Pl̄/a) with for 1, a = 8.522(4), b = 9.332(3), c = 11.437(5) Å, α = 87.71(3)°, β = 89.81(3)°, γ = 70.70(3)°, R = 0.042, Z = 2, R = 0.042; and for 2, a = 10.647(2), b = 10.746(2), c = 12.679(2) Å, α = 87.47(1)°, β = 86.51(2)°, γ = 83.10(2)°, Z = 2, R = 0.036. The coordination polyhedron of the copper atom in structure 1 is a distorted square pyramid, in which the carbonyl oxygen atoms and nitroso group nitrogen atoms form the base (1.96-2.00 Å) and oxygen atom of the water molecule occupies the apical position (2.21 Å). In complex 2, the copper atom is surrounded by a distorted octahedron, whose equatorial plane (2.01-2.03 Å) is formed by nitrogen atoms of nitroso groups and heterocyclic amines, and the axial positions (2.30 and 2.50 Å) are occupied by oxygen atoms of carbonyl groups. The benzoylcyanoximato groups are coordinated bidentate by the nitroso nitrogen atoms and carbonyl oxygen atoms, forming a chelate ring.

Document Type

Article

Publication Date

1-1-1997

Journal Title

Russian Journal of Inorganic Chemistry

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