Chemistry is the experimental and theoretical study of materials on their properties at both the macroscopic and microscopic levels.In a patent， Application In Synthesis of Vanadyl acetylacetonate, Which mentioned a new discovery about 3153-26-2
2-Hydroxybenzoylhydrazide reacts with an equimolar amount of [V IVO(acac)2] and [VIVO(bzac)2] [where acac- and bzac- are the monoanionic forms of acetylacetone (Hacac) and benzoylacetone (Hbzac) respectively] in the presence of an equimolar amount of 2,2?-bipyridine (bipy) in methanol to afford the tetravalent complexes [VIVO(HL1)(bipy)] (1) and [V IVO(HL2)(bipy)] (2) respectively [where (HL 1)2- and (HL2)2- represent the dianionic forms of the 2-hydroxybenzoylhydrazone of acetylacetone (H 3L1) and benzoylacetone (H3L2) respectively]. On replacing bipy by 8-hydroxyquinoline (Hhq) or vanillin (Hvan), the pentavalent complexes [VVO(HL1/HL2)(hq)] (3/4) and [VVO(HL1/HL2)(van)] (5/6) respectively were obtained. These pentadentate hydrazone ligands bind the vanadium in a tridentate dinegative meridional fashion utilizing their enolic-O, one imine-N and amide-O (in the enol form), leaving the other two potential donor sites, viz., phenolic-O and the other imine-N, which are practically H-bonded intramolecularly, as is evident from IR, 1H NMR and X-ray diffraction (of 3 and 4) studies. The EPR active tetravalent complexes 1 and 2 exhibit a quasi-reversible one-electron oxidation peak near +0.90 V, while the pentavalent complexes 3 and 4 exhibit quasi-reversible one-electron reduction peaks near -0.07 V versus SCE in CH2Cl2 solution. The [VVO(HL)(van)] complexes 5 and 6 display two quasi-reversible one-electron reduction peaks near +0.06 V and near +0.40 V versus SCE in CH 2Cl2 solution, attributed to the successive reduction of VV ? VIV and VIV ? VIII respectively.
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Reference：
Metal catalyst and ligand design,
Ligand Template Strategies for Catalyst Encapsulation – NCBI