Mixed-ligand oxovanadium(V) complexes incorporating bidentate salicylaldehyde and tridentate aldimine ligands

Abstract

Mixed-ligand oxovanadium(V) complexes, [vvo(L) -(sal)], containing salicylaldimine ligands of c~-amino acids HzL [,,(1); R = Me, i-Pr and CHzPh ] and salicylaldehyde (Hsal) have been synthesized. The coordination sphere of the complexes is of the VO(ONO)(OO) type, where O atoms are phenolic, carboxylic and aldehydic, and N is of the azomethine type. The complexes are diamagnetic and exhibit only one LMCT band at ca. 490nm. They display quasi-reversible one-electron reduction peaks in a CHzClz-MeCN (2:1v/v) mixture in the 0.07-0.13V versus s.c.e, range. A trend in the redox potential data has been rationalized on the basis of conventional normal substituent effects.

Albumin Conjugating Amino Acid Schiff-Base Metal Complexes for Scavenging Superoxide Anion Radical

“…The amino acid Schiff-base in the parent compound is sulfonated by introducing the hydrophilic group. Besides, the second ligand is introduced to improve the water solubility and biological activity [8].…”

Ligand controlled synthesis of mixed-ligand oxovanadium(V) and oxovanadium(IV) complexes

“…This study also indicates that the deprotonation of the CH 2 OH group of H 2 L ligand in the complexes depends upon the oxidation state of the metal as this group is deprotonated if the metal is in pentavalent state (e.g., in 1 and 2) but it remains protonated if the metal is in the tetravalent state (e.g., in 3). Though there are very few examples containing acetylacetone in the mixedligand oxovanadium(IV) complexes, 22,23 to the best of our knowledge, no such example in the pentavalent state has been reported.…”