Synthesis, spectral and EPR studies of oxovanadium(IV) complexes incorporating tridentate ONO donor hydrazone ligands: Structural study of one oxovanadium(V) complex

Design of vanadium mixed-ligand complexes as potential anti-protozoa agents

“…The spin-Hamiltonian parameters for species I of all four complexes are the same within experimental error regardless the solvent used, indicating the same binding mode for all four complexes, and are very close to those recently reported for [V IV O(L)(bipy or phen)] complexes (H 2 L = 2-hydroxy-4-methoxybenzaldehyde nicotinic acid hydrazone or 2-hydroxy-4-methoxyacetophenone nicotinic acid hydrazone) [43].…”

Chemistry of molecular and supramolecular structures of vanadium(IV) and dioxygen-bridged V(V) complexes incorporating tridentate hydrazone ligands

“…The binuclear complex is centrosymmetric, being disposed about a crystallographic centre of inversion. Each VO 2 + is coordinated by the tridentate BPB anion via the pyridyl-N1, azomethine-N2 and enolic-O1 atoms [24]. The final position in the hexacoordinated geometry is completed by a bridging oxo-O2 i atom.…”

Synthesis, spectral and structural studies of oxovanadium(IV/V) complexes derived from 2-hydroxyacetophenone-3-hydroxy-2-naphthoylhydrazone: polymorphs of oxovanadium(V) complex [VOL(OCH3)]

“…The richness and importance of vanadate chemistry have emerged for quite some time [5][6][7]. In continuation of our work on the synthesis and characterization of aroyl hydrazones and their coordination compounds [8][9][10][11][12], we report here the synthesis and characterization of oxovanadium (IV/V) complexes of 2-hydroxyacetophenone-3-hydroxy-2-naphthoylhydrazone (H 2 L) along with the crystal structure of an oxovanadium(V) complex existing in two polymorphic forms. In addition to the azomethine nitrogen and carbonyl oxygen, the coordinating capacity of the ligand has been enhanced by the presence of coordinating oxygen in the phenyl ring of aromatic ketone.…”