Synthesis, structural characterization and spectroscopy studies of new oxovanadium(IV, V) complexes with hydrazone ligands. (17th February 2015)

• Record Type: Journal Article
• Authors: Paciorek, Patrycja; Szklarzewicz, Janusz; Jasińska, Anna; Trzewik, Bartosz; Nitek, Wojciech; Hodorowicz, Maciej
• Is Part Of: Polyhedron. Volume 87(2015)
• Page Start: 226
• Page End: 232
• Publication Date: 2015-02-17
• Subjects: Vanadium -- Crystal structures -- Hydrazone -- NMR spectra -- UV–Vis spectra; Chemistry, Inorganic -- Periodicals; Chimie inorganique -- Périodiques; Organometaalverbindingen; Anorganische chemie; 546.05
• DOI: 10.1016/j.poly.2014.11.018
• Languages: English
• ISSNs: 0277-5387

Abstract

Abstract : Graphical abstract: Four vanadium complexes with hydrazone ligands were characterized by IR, UV–Vis, NMR, cyclic voltammetry and magnetic susceptibility measurements. X-ray crystal structures of two monomeric and one polymeric compound are described. Abstract: The reaction of vanadyl acetoacetonate, VO(acac)2, with 2-hydroxybenzaldehyde hydrazone in ethanol gave the mononuclear oxovanadium(IV) complex [VO(salh1 )2 ] (1 ). However, when the hydrazides 3-hydroxy-2-naphthoic acid hydrazide (h2 ) and 5-phenylisoxazole-3-carboxylicacidhydrazide (h3 ) were used, the mononuclear oxoethoxovanadium(V) complexes [VO(acanh2 )(OEt)] (2 ) and [VO(acanh3 )(OEt)] (3 ) were isolated, respectively. The reaction with benzene-1, 4-dicarbohydrazide (h4 ) in a water–ethanol solution gave polynuclear {[VO(μ-EtO)2 ](μ-acanh4 )} n (4 ). The complexes were characterized by elemental analysis, IR, UV–Vis and 51 V NMR spectra. Magnetic susceptibility measurements indicated the +5 vanadium oxidation state in2, 3 and4 and +4 in1 . X-ray single crystal diffraction studies revealed that the vanadium(V) center has a distorted square pyramidal geometry in2 and3, and a distorted octahedral geometry in4, with an O3 N coordination environment around the V(V) acceptor center. Complex4 is a polymeric compound with dihydrazide ligand as a linker and each two vanadium ions are connected via two μ-ethoxo bridges.