Mixed ligand complexes of cobalt(II and III) — Molecular structure of <i>bis-</i>(4-acetophenylsalicylaldiminato)acetylacetonato cobalt(III)

1050-1054The bidentate Schiff bases, HL'(= N-4-acetophenylsalicylal-dimine), H"(=N-3-acetophenylsalicylaidimine) and HL'"(=N-4-acetophenyl-5-bromosalicylaldimine) do not form complexes with simple cobalt(II)salts, e.g.,Co(CH3COO)2.4H2O and CoCl2.6H2O but undergo facile reactions with Co(acac)2.2H2O (acac=monoanion of acetylacetone). Mixed ligand complexes of both cobalt(III), [Co(L)2(acac)] and cobalt(II), [Co(L)(acac)] (L=L', L", L"') have been isolated and characterised by elemental analyses and magnetic susceptibility measurements, electronic, IR and mass spectral studies and by single crystal X-ray crystallographic structure analysis. The cobalt atom is octahedrally coordinated in which four ligand oxygen atoms define an equatorial plane; the two nitrogen atoms of the L' ligands are in trans-axial positions

Synthesis and reactivity of the copper (II) complexes of N-α-acetophenyl-X-salicylaldimines (α = 4 or 3, X = H, 5-Br or 3-COOH ). Molecular structure of <i>bis-</i>(N-4-acetophenyl-salicylaldiminato) copper(II)

1380-1384The copper (II) complexes of the Schiff bases, N-α-acetophenyl-X-salicylaldimines (α = 4 or 3, X = H, 5-Br or 3-COOH) have been synthesised and characterised by UV-visible, IR, MS, ESR spectroscopy and magnetic susceptibility measurements. The solid state structure of Cu(SACPNx)2 (I) determined by single-crystal X-ray diffraction reveals a distorted square-planar metal coordination involving two imine N- and two deprotonated phenolate O atoms of two bidentate Schiff ligands in trans- arrangement. Both the Schiff bases and their copper (II) complexes undergo facile transamination reactions