Cobalt(II), Nickel(II) and Copper(II) Complexes of 1-Hydroxy-2-Naphthyl(4-X-Styryl) Ketoneoximes

Abstract

Metal complexes of the type ML₂ [M = Co(II), Ni(II), Cu(II);

L = 1-hydroxy-2-naphthyl( 4-X -styryl)ketoneoximes (HNXSKOx),
(X = H, Me, MeO)] have been synthesized. All the chelates are
anhydrous. The copper complexes possess trans-square-planar geometry
and the nickel and cobalt complexes have low-spin transsquare-
planar configuration. As the conjugation of C=N with
Ph—C=C is inhibited, the basic nature of oximino nitrogen is not
affected. The strong M—N  σ-bond leads to enhanced ligand field
strength and spin-pairing.