Synthesis, characterization, and crystal structure of mononuclear and dinuclear dioxomolybdenum(VI) complexes with tridentate Schiff-base ligands. Part 2

Mononuclear [MoO2LD], and dinuclear [MoO2L](2) or [MoO2L](2)D-. dixomolybdenum(VI) complexes have been prepared by the reaction of tridentate Schiff-base ligands L with [MoO2(acac)(2)]. The Schiff-base ligands have been synthesized from salicylaldehyde (1, 1a, 1c, 1d), 2-hydroxy-1-naphthaldehyde (2, 2c) and 2-hydroxy-3-methoxybenzaldehyde (3a, 3b, 3c, 3d, 3e) with 2-amino-p-cresol. All prepared complexes consist of cis-MoO22+ core coordinated by Schiff-base ligand through two deprotonated hydroxyl groups and one imino nitrogen atom. The usual octahedral coordination around the molybdenum atoms is completed by the neutral ligand D (methanol, ethanol, dimethyl sulfoxide, imidazole or 4,4'-bipyridine). All compounds were characterized by elemental analyses, IR spectroscopy and some of them by X-ray crystallography (1a, 2c, 3a, 3b, 3c and 3c).