SPECTROSCOPIC PROPERTIES AND CRYSTAL-STRUCTURE OF AN OXOVANADIUM(V) ALKOXO COMPLEX WITH THE LIGAND - 5-CHLORO-O-HYDROXYACETOPHENONE-SALICYLHYDRAZIDE

The preparation and characterization by means of IR and electronic spe ctroscopies, magnetic measurements and molecular structure by X-ray di ffraction of a single-crystal are reported for a monomeric oxovanadium (V) complex: [(VO)-O-v(5Cl-OHA-SHZ)(OCH2CH3)], where (5Cl-OHA-SHZ) is the dianionic tridentate ONO donor ligand 5-chloro-o-hydroxyacetopheno ne-salicylhydrazide. The vanadium atom is essentially five coordinate. Three ONO donor atoms of the (5Cl-OHA-SHZ) ligand and an oxygen atom from an alkoxide group form a distorted square-pyramidal geometry arou nd the metal center. The basal coordination plane is formed by three d onor atoms ONO (a phenolic oxygen, an imine nitrogen and an enolic oxy gen) from the ligand and an oxygen atom from the alkoxide group. This structure is compared with the corresponding copper (II) complex with the same ligand. Copyright (C) 1997 Elsevier Science Ltd.