Lipophilic chloro-oxo-bis(hydroxamato)vanadium(V) complexes: synthesis methods and structure

摘要

New methods for the synthesis of vanadium(V) complexes with hydrophobic alkyl- and aryl-substituted hydroxamic acids as well as hydrophilic ones have been developed. A number of novel coordination compounds of the general formula VOL2Cl (where HL is N-phenylaceto-, N-methylbenzo-, N-methyldecanoor N-methylacetohydroxamic acid) have been synthesized. Complexes of the above formula with alkyl substituents on the ligands have been obtained for the first time. All the compounds obtained have been characterized by UV-Vis, IR, H-1 and V-51 NMR spectroscopy. Studies using the V-51 NMR method showed the presence of two forms of the complexes in solution, which coalesce with increasing temperature. Chloro-oxo-bis(N-methylacetohydroxamato)vanadium(V) has been characterized by X-ray crystallography. The effect of the electron donating properties of the ligand substituents on the structure of the complexes is discussed. (C) 2020 Published by Elsevier Ltd.