Preparation, Structural and Spectroscopic Characterization of Vanadium(IV) and Vanadium(V) Complexes with Dipicolinic Acid

Abstract

The reaction of dipicolinic acid, dipicH2, with vanadyl sulfate in the mixture of ethanol and water led to the formation of[VO(dipic)(H2O)2]·C2H5OH (1) and [VO(dipic)(H2O)(OC2H5)] (2). Complex 1 was obtained first and complex 2 after prolonged standing of the mother liquor in air. Both complexes were characterized by elemental analyses, IR, Raman and UV/Vis spectroscopic analyses and their structures were determined by X‐ray diffraction. The vanadium(IV) ion in 1 and vanadium(V) ion in 2 are both coordinated by the O,N,O′‐tridentate dipicolinate ligand. The octahedral coordination of the vanadium(IV) atom is completed by two water molecules in trans position and by an oxo oxygen atom, whereas the vanadium(V) atom is additionally coordinated by an oxo oxygen atom and a water molecule in trans position and by an ethoxido oxygen atom. A co‐crystallized ethanol molecule is also present in the crystal structure of 1. Molecules of [VO(dipic)(H2O)2] and ethanol are linked into a 2D network by the O–H···O hydrogen bonds in the structure of 1. Molecules of 2 are assembled into a 3D structure by the O–H···O hydrogen bonds.

Synthesis and crystal structure of 2-amino-3-hydroxypyridinium dioxido(pyridine-2,6-dicarboxylato-κ3O2,N,O6)vanadate(V) and its conversion to nanostructured V2O5

“…at 1002 cm À1 (Kriza et al, 2010), but the higher vanadium oxidation state in (I) causes a decrease in the frequency of the V O stretching (Hakimi et al, 2011).…”

Synthesis and characterization of a new oxovanadium Schiff base of salicylaldehyde-arginine- hydroxyquinoline: antibacterial and antifungal activities determination

“…The absorption peaks at 638 cm − 1 and 536 cm − 1 correspond to V-O and V-N stretching vibrations, respectively [14,15]. The u.v spectra of the Schiff base ligand and the oxovanadium complex were recorded in CH 3 CN (Fig.…”