Synthesis and characterization of new vanadium salcylaldoxime based complexes isolated by hydrothermal process.

Abstract

In this paper, the results of a systematic study of the reactivity of salicylaldoxime (C₇H₇NO₂)(H₂L¹), with aqueous solutions of V(IV) using hydrothermal synthesis are reported. These reactions lead to the formation of gray-blue compounds : (1) adduct of the formula Na₄[V₆^IVV₄^VO₂₂H₂(OH)₆(C₇H₆O₂)2(C₇H₅NO)].6H₂O (A1), (2) another adduct of formula H₆[V₃^IVV₇^VO₂₅(OH)₃ (C₇H₈NO₂) (C₇H₅NO)2(C₇H₆O₂)].5H₂O (A2) and (3) a trimetric coordination complex of the formula [V₃O₅(C₇H₅NO)₃(C₇H₄NO₂)₃(C₇H₇NO₂)₃]·(H₂O) (C1). The obtained compounds were characterized by means of elemental analysis, conductometry, UV-Visible, Fourier transform infrared absorption spectroscopy (FTIR), 1H and 51V nuclear magnetic resonance (NMR), EPR, magnetic measurements, mass spectroscopy and cyclic voltammetry.

Key words: hydrothermal synthesis, vanadium complexes, salicylaldoxime.