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
✍ Scribed by Davi Fernando Back; Marco Aurélio Ballin; Gelson Manzoni de Oliveira
- Publisher
- Elsevier Science
- Year
- 2009
- Tongue
- English
- Weight
- 480 KB
- Volume
- 935
- Category
- Article
- ISSN
- 0022-2860
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✦ Synopsis
The Schiff base ligand {3-hydroxyl-5-(hydroxymethyl)-2-methylpyridine-4-yl-methylene}benzohydrazide hydrochloride monohydrated {(hhmmbH)ClÁH 2 O} (1) was prepared by reaction of pyridoxine hydrochloride with benzoic acid hydrazide. The reaction of 1 with [VO(acac) 2 ] and triethylamine yields the neutral vanadium IV complex [VO 2 (hhmmb)]ÁPy (2), with a distorted quadratic pyramidal configuration. The Schiff base 1 reacts also with UO 2 (NO 3 ) 2 Á6H 2 O and triethylamine under deprotonation giving the uranium VI cationic complexes [UO 2 (hhmmb)(H 2 O)Cl] + (3) and [UO 2 (hhmmb)(CH 3 OH)Cl] + (4), both showing the classical pentagonal bipyrimidal geometry of UO 2 2þ complexes. The structural features of all compounds are discussed.