Peroxovanadium(V) Complexes of L-Lactic Acid as Studied by NMR Spectroscopy

Abstract

A multinuclear ( 1 H, 13 C, 17 O, 51 V) 1D and 2D NMR study of the complexation of L-lactic acid with vanadium(V) and hydrogen peroxide shows that four peroxo complexes are formed in aqueous solution in the pH range 1−7. Two isomeric 2:2:1 (metal:ligand:peroxo) complexes, together with a 2:2:2 species, are found over the entire pH range. At pH

Synthesis and characterization of vanadium(V) complexes with ?-hydroxyhippuric acid. The X-ray crystal structure of (NBu 4)2[V2O2(O2)2(R-?-hhip) (S-?-hhip)]�5H2O,[?-hhip = ?-hydroxyhippurato(2-)]

“…The 51 V-n.m.r. spectra of a-hydroxycarboxylato oxo peroxo complexes of vanadium(V) have been currently studied [29,[41][42][43][44][45][46]. The 51 V chemical shifts in vanadium complexes are known to be sensitive to the coordination number of the metal centre and to the nature of the ligands.…”

“…metal centres is the dioxovanadium centre, was proposed for the complexes with L -lactic, glycolic and mandelic acids [29,42,[44][45][46]. range with a minimum at 83°C (Dx exp ¼ 9.3%, Dx calc ¼ 9.1%).…”

Synthesis and characterization of vanadium(V) complexes with ?-hydroxyhippuric acid. The X-ray crystal structure of (NBu 4)2[V2O2(O2)2(R-?-hhip) (S-?-hhip)]�5H2O,[?-hhip = ?-hydroxyhippurato(2-)]

“…The 51 V-n.m.r. spectra of a-hydroxycarboxylato oxo peroxo complexes of vanadium(V) have been currently studied [29,[41][42][43][44][45][46]. The 51 V chemical shifts in vanadium complexes are known to be sensitive to the coordination number of the metal centre and to the nature of the ligands.…”

“…metal centres is the dioxovanadium centre, was proposed for the complexes with L -lactic, glycolic and mandelic acids [29,42,[44][45][46]. range with a minimum at 83°C (Dx exp ¼ 9.3%, Dx calc ¼ 9.1%).…”

Synthesis and characterization of vanadium(V) complexes with ?-hydroxyhippuric acid. The X-ray crystal structure of (NBu 4)2[V2O2(O2)2(R-?-hhip) (S-?-hhip)]�5H2O,[?-hhip = ?-hydroxyhippurato(2-)]

“…The 51 V-n.m.r. spectra of a-hydroxycarboxylato oxo peroxo complexes of vanadium(V) have been currently studied [29,[41][42][43][44][45][46]. The 51 V chemical shifts in vanadium complexes are known to be sensitive to the coordination number of the metal centre and to the nature of the ligands.…”

“…metal centres is the dioxovanadium centre, was proposed for the complexes with L -lactic, glycolic and mandelic acids [29,42,[44][45][46]. range with a minimum at 83°C (Dx exp ¼ 9.3%, Dx calc ¼ 9.1%).…”

Synthesis and characterization of vanadium(V) complexes with ?-hydroxyhippuric acid. The X-ray crystal structure of (NBu 4)2[V2O2(O2)2(R-?-hhip) (S-?-hhip)]�5H2O,[?-hhip = ?-hydroxyhippurato(2-)]

“…The 51 V-n.m.r. spectra of a-hydroxycarboxylato oxo peroxo complexes of vanadium(V) have been currently studied [29,[41][42][43][44][45][46]. The 51 V chemical shifts in vanadium complexes are known to be sensitive to the coordination number of the metal centre and to the nature of the ligands.…”

“…metal centres is the dioxovanadium centre, was proposed for the complexes with L -lactic, glycolic and mandelic acids [29,42,[44][45][46]. range with a minimum at 83°C (Dx exp ¼ 9.3%, Dx calc ¼ 9.1%).…”