TWO WATER-COORDINATED MONONUCLEAR MOLYBDENUM(VI) OXO COMPLEXES WITH SIMILAR TRIDENTATE HYDRAZONE LIGANDS: SYNTHESIS AND CRYSTAL STRUCTURES

Abstract

ABSTRACT Reaction of [MoO 2 (acac) 2 ] (where acac = acetylacetonate) with two similar hydrazone ligands in methanol yielded two water coordinated mononuclear molybdenum(VI) oxo complexes with general formula [MoO 2 L(OH 2 )], where L = L 1 = N’ -(2-hydroxy-3-methoxybenzylidene)-2-methoxybenzohydrazide (H 2 L 1 ), and L = L 2 = N’ -(3-ethoxy-2-hydroxybenzylidene)-2-methoxybenzohydrazide (H 2 L 2 ). Crystal and molecular structures of the complexes were determined by single crystal X-ray diffraction method. All of the investigated compounds were further characterized by elemental analysis and FT-IR spectra. Single crystal X-ray structural studies indicate that the hydrazone ligands coordinate to the MoO 2 cores through enolate oxygen, phenolate oxygen and azomethine nitrogen. The Mo atoms in both complexes are in octahedral coordination. Keywords: molybdenum complex; hydrazone ligand; crystal structure; X-ray diffraction. INTRODUCTION The coordination chemistry of molybdenum(VI) has attracted considerable attention due to its recently discovered biochemical significance