Asymmetric dinuclear hydroxyl and ethoxyl citrato dioxovanadates(V)

Abstract

Asymmetric citrato dioxovanadates(V), [Hneo](4)[V2O4(R-Hcit)(OH)][V2O4(S-Hcit)(OH)] center dot 4H(2)O (1) and [Ni(phen)(3)](2)[V2O4(R-Hcit)(OC2H5)][V2O4(S- Hcit)(OC2H5)] center dot 4H(2)O (2) and (H(4)cit citric acid, neo 2,9-dimethyl-1,10-phenanthroline, phen 1,10-phenanthroline) are isolated with the help of large counterions. Structural analyses of complexes 1 and 2 show that vanadium atoms are coordinated by tridentate citrate ligand and hydroxy or ethoxy groups, respectively. The insertions of hydroxy and ethoxy groups give new examples of the mixed RO-bridges for vanadium-citrate complexes

Decavanadate Inhibits Mycobacterial Growth More Potently Than Other Oxovanadates

“…At these higher pH values, the VCit complex is found to form in solutions containing both V 1 and citrate. Many different VCit complexes are known, however, the broad doublet signal observe for the VCit could be several structures as described in the literature (Ehde et al, 1989 ; Zhou et al, 1999 ; Crans, 2000 ; Kaliva et al, 2002 , 2003 ; Chen et al, 2007 , 2014 ; Lodyga-Chruscinska et al, 2008 ). The final spectra show the addition of the vanadate stock solution to media, which at pH 6.9 results in a solution that contains a signal of V 1 and PV, V 2 , and V 4 and a trace of V 5 .…”

“…The spectra shown in Figure 2 demonstrated that the V 10 is stable in the growth media, which is consistent with studies in yeast media reported previously (Willsky et al, 1984a , 1985 ). The data shown in Figure 2 demonstrated that at pH 2, the V 10 forms complexes with citrate but as the pH increased to near neutral pH, V 10 did not form such products with growth media components (Ehde et al, 1989 ; Zhou et al, 1999 ; Crans, 2000 ; Kaliva et al, 2002 , 2003 ; Chen et al, 2007 , 2014 ; Lodyga-Chruscinska et al, 2008 ). In contrast, when V 10 is converted to the oxovanadates or V 1 is the starting form at vanadium, the VCit and PV complexes are formed (this is generally observed in solutions at neutral or more basic pH values, Figure 3 ).…”

Degradations of novel tetranuclear vanadyl glycollates to dinuclear species

“…Up to now, much work have been carried out to investigate the direct coordination chemistry of vanadium homocitrate [14,15], and its homologues citrate [15][16][17][18][19][20][21][22][23][24][25][26][27], malate [28,29], lactate [28] or glycollate [28,30,31]. These α-hydroxycarboxylates bind to the vanadium atom through their α-alkoxy, α-carboxy and/or β-carboxy groups.…”