Synthesis and structural features of UVI and VIV chelate complexes with (hhmmbH)Cl·H2O [hhmmb = {3-hydroxyl-5-(hydroxymethyl)-2-methylpyridine-4-yl-methylene}benzohydrazide], a new Schiff base ligand derived from vitamin B6
摘要:
The Schiff base ligand [3-hydroxyl-5-(hydroxymethyl)-2-methylpyridine-4-yl-methylene)benzohydrazide hydrochloride monohydrated ((hhmmbH)Cl center dot H2O) (1) was prepared by reaction of pyridoxine hydrochloride with benzoic acid hydrazide. The reaction of I with [VO(acac)(2)] and triethylamine yields the neutral vanadium(IV) complex [VO2(hhmmb)]center dot Py (2), with a distorted quadratic pyramidal configuration. The Schiff base I reacts also with UO2(NO3)(2)center dot 6H(2)O and triethylamine under deprotonation giving the uranium(VI) cationic complexes [UO2(hhmmb)(H2O)Cl](+) (3) and [UO2(hhmmb)(CH3OH)Cl](+) (4), both showing the classical pentagonal bipyrimidal geometry of UO22+ complexes. The structural features of all compounds are discussed. (C) 2009 Elsevier B.V. All rights reserved.