Synthesis and structural characterization of mixed ligand η1-2-hydroxyacetophenone complexes of cobalt(III)

A tridentate Schiff base ligand [(CH3)(2)NCH2CH2N=C(CH3)C6H4OH)] (LH) has been synthesized from 2-hydroxyacetophenone and 2-dimethylaminoethylamine. This ligand forms the neutral complexes [Co(L)(N-3){o-(CH3C=O)C6H4O}] (1) and [Co(L)(SCN){o-(CH3C=O)C6H4O}].1/2H(2)O (2) in presence of equivalent amount of Co(II) acetate, and sodium azide for 1 and sodium thiocyanate for 2. The complexes have been characterized by spectroscopic and crystallographic methods. The coordination geometry around Co(III) in both the complexes is distorted octahedral with one tridentate ligand L, one bidentate 2-hydroxyacetophenone and one monodentate azide for 1 and thiocyanate for 2. The azide and thiocyanate ligands in the two complexes occupy different positions relative to the coordination sites of L. (C) 2000 Elsevier Science B.V. All rights reserved.