Vanadium(V) Oxoperoxo Complexes with Side Chain SubstitutedN‐Salicylidenehydrazides: Modeling Supramolecular Interactions inVanadium Haloperoxidases

Abstract

Keywords: Hydrogen bonds / Oxidative bromination / Peroxo ligands / Salicylidenehydrazide ligand / VanadiumThe Schiff-base ligand derived from salicylaldehyde and γ-hydroxybutanoic acid hydrazide (H 2 Salhyhb) reacts with potassium metavanadate and hydrogen peroxide in a water/ methanol solution with a pH value of around two to yield the corresponding vanadium(V) oxoperoxo complex [VO(O 2 )-HSalhyhb(H 2 O)] (1). Complex 1 crystallizes with one molecule of water as 1·H 2 O in the monoclinic space group P2 1 /n. For the vanadium atom a pentagonal-bipyramidal coordination geometry is observed, with a side-on bonded peroxo ligand in the equatorial plane. The hydroxy side chain of the hydrazide ligand is involved in a hydrogen-bond network with the peroxo ligand at the vanadium atom. This network

Structural and spectroscopic study of Mg13.4(OH)6(HVO4)2(H0.2VO4)6

“…In vanadium(V) complexes, the (HVO 4 ) 2-group is well known and present in numerous structures [22][23][24]. However, until now a (HVO 4 ) 2-group was not found among purely inorganic compounds.…”

Recent advances in vanadium catalyzed oxygen transfer reactions

“…Plass [59] reported that a N-salicylidene alkoxo vanadium(V) oxoperoxo complex which has, in the solid state, a pentagonalbipyramidal coordination geometry, with a side-on bonded peroxo ligand in the equatorial plane, is able to brominate, under stoichiometric conditions, 1,3,5-trimethoxybenzene (TMB) in the presence of tetrabutylammonium bromide (90% yield). More recently Xing et al reported that oxovanadium(IV)-carboxylate complexes are effective systems in the bromination reaction of phenol red to bromophenol blue in phosphate buffer [60].…”

New Aspects for Modeling Supramolecular Interactions in Vanadium Haloperoxidases: β‐Cyclodextrin Inclusion Compounds of cis‐Dioxovanadium(V) Complexes

“…[12] We have recently reported the application of the N-salicylidene hydrazide ligand system for generating vanadium(V) complexes with a variety of functional groups attached to the ligand core. [7,8,13,14] Extending this approach, we report herein the synthesis and structure of a cis-dioxovanadium(V) complex containing an appropriate apolar biphenyl group in the ligand side chain, and its inclusion compound with β-CD.…”

“…Examples for such vanadium complexes derived from N-salicylidene hydrazides with a hydroxy substituted side chain have recently been reported. [7,8] An alternative method to provide such an environment for the complex moieties can be through their interaction with appropriate host molecules, which would generate host-guest assemblies. Cyclodextrins (CDs) represent hosts tallizes with additional water molecules in the triclinic space group P1.…”