Synthesis and crystal structure of a salicylatooxovanadium(V) complex of an aminebis(phenolate) ligand: Kinetic studies on its formation from corresponding alkoxo complexes

Abstract

Synthesis and single crystal X-ray structures of H 2L 1 and VO( L 1 )( HL) [H 2L 1 = N, N-bis(2-hydroxy-3,5-ditertiarybutyl)- N′, N′-dimethylethylendiamine) or simply aminebis(phenol) and H 2L = salicylic acid) are reported here. The complex [ VO( L 1 )( HL)] is in distorted octahedral geometry under O 4N 2 donor environment where the basal core is defined by O(1), O(3), O(2) and N(5) atoms and two axial coordinates are occupied by O(4), an alkoxo-group and N(1), an imino-nitrogen atom. The electron spray mass spectrometric study on [ VO( L 1 )( HL)] in MeCN clearly points out the existence of single species in solution. Again, the 51V NMR of the bulk polycrystalline sample reveals that the complex [ VO( L 1 )( HL)] mainly exists in three out of four possible isomers. The formation of [ VO( L 1 )( HL)] from both [ VO( L 1 )( OMe)] and [ VO( L 1 )( OEt)] was followed kinetically by reacting with salicylic acid in MeCN. The presence of isosbestic point indicates a clean conversion of the reactants to product.