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Published in Alina Kabata-Pendias, Barbara Szteke, Trace Elements in Abiotic and Biotic Environments, 2015
Alina Kabata-Pendias, Barbara Szteke
Absorption of V from the gastrointestinal tract is poor, not exceeding 2% (WHO 1988). Its highest concentrations occur in the liver, kidney, and lung. However, it is mainly stored in fat and serum lipids. No biochemical function of V has been yet defined in humans. Presumable, V plays a role in metabolism of carbohydrates, and also in metabolism of cholesterol and blood lipids. It controls the biosynthesis of cystine and cholesterol, depression and stimulation of phospholipid synthesis, and, at higher concentrations, inhibition of serotonin oxidation. In diabetics, V supplement may have a positive effect in regulating blood glucose levels. Possibly, V prevents heart attack, cataract development, and impaired anti-oxidant status (ATSDR 2012d). The potential role of V in humans is building material of bones and teeth, and stimulating muscle development (Badmaev et al. 1999). However, gastrointestinal effects (diarrhea, cramps, nausea, and vomiting) may occur in non-insulin-dependent diabetic patients, administered vanadyl sulfate or sodium metavanadate capsules, as a supplement to their diabetes treatment (ATSDR 2012d).
Green synthesis of a vanadium(V) Schiff base complex by grinding method: study on its catalytic and anti-bacterial activity
Published in Journal of Coordination Chemistry, 2021
Jeena Jyoti Boruah, Zankhana S. Bhatt, Chirag R. Nathani, Vaishali J. Bambhaniya, Ankur Kanti Guha, Siva Prased Das
The vanadium complex Na[VO2L] was synthesized by the LAG method by reacting vanadyl sulfate and H2L. We used 0.25 mL of methanol/DMSO (1:1 mixture) as solvent (Scheme 1) which is required to make the mixture pasty. The vanadium(IV) center undergoes aerial oxidation to vanadium(V) during grinding. The presence of NaOH in the reaction mixture is necessary as it provided the counter cation for the formation of +5 oxidation state in Na[VO2L]. The reaction was completed in 45 min of grinding with isolated yield of 98%. We have also synthesized Na[VO2L] by refluxing the mixture of vanadyl sulfate, NaOH and H2L in methanol. But the process required 24 h of reaction time to complete. Thus, the LAG synthesis of Na[VO2L] is much more effective than the classical method.
REVIEW: metal complexes as urease inhibitors
Published in Journal of Coordination Chemistry, 2018
Ladislav Habala, Ferdinand Devínsky, Alexander E. Egger
In the series of oxovanadium(V) Schiff base complexes reported by You et al., the highest activity against HPU was found in complexes derived from Schiff base ligands with the shortest amine moiety [107]. The activities were in all cases higher than the activity of vanadyl sulfate. Similar observation was made also in a series of dinuclear oxovanadium(V) complexes with the general composition [VO2(L)]2 [108]. You et al. compared activities against HPU in a series of vanadium(V) complexes of Schiff bases derived from substituted aromatic aldehydes and various amines [109]. The authors concluded that chloro-substituted complexes have stronger activities than the methoxy- or ethoxy-substituted complexes.
A review on synthesis and applications of some selected Schiff bases with their transition metal complexes
Published in Journal of Coordination Chemistry, 2022
Attia Kanwal, Bushra Parveen, Rizwan Ashraf, Noman Haider, Kulsoom Ghulam Ali
Based on Schiff bases the vanadium complexes have been used as precursors to synthesize vanadium pentoxide (V2O5) nanoparticles. The synthesized Schiff base was mixed with vanadyl acetylacetonate to obtain precursor Schiff base complexes. By using calcination process, the vanadium complexes undergo thermal evaporation-condensation at 600 °C for three hours, V2O5 nanoparticles were synthesized (Figure 17) [98]. A spectrophotometer was used to investigate microbial activity and photocatalytic activity. These V2O5 nanoparticles showed photocatalytic activity and degrade Eosin yellow, an organic dye.