Complexation of tungsten(<scp>VI</scp>) with citrate

Cruywagen, J. J.; Krüger, Leon; Rohwer, Erich G.

doi:10.1039/dt9910001727

Cited by 62 publications

(49 citation statements)

References 14 publications

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“…Caledeira et al proposed that the complex of Mo(VI) with glycolic acid is a 1:2 (Mo:ligand) species at pH of 5.1 [32][33][34]. The complex of Mo(VI) with S-lactic acid was also shown to be a 1:2 species [35,36]. Preparation of complexes (1) and (2) confirmed that the 1:2 species that separate mainly depend on the pH value and the reactant ratio.…”

Section: Resultsmentioning

confidence: 54%

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Syntheses, crystal structures and biological relevance of glycolato and S-lactato molybdates

Zhou

Hou

Cao

et al. 2004

Journal of Inorganic Biochemistry

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Section: Resultsmentioning

confidence: 54%

“…Lactic acid is an important component in the metabolism of glucose, and in tissues up to 50% of glucose is converted into lactic acid. Some glycolato and lactato molybdates have been studied in solution [32][33][34][35][36] …”

Section: Introductionmentioning

confidence: 99%

Syntheses, crystal structures and biological relevance of glycolato and S-lactato molybdates

Zhou

Hou

Cao

et al. 2004

Journal of Inorganic Biochemistry

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“…For this purpose, a system of equations was solved using adopted Maple6 (Waterloo Maple Software and University of Waterloo). The set of equations was based on: (i) the equilibrium constants for all compounds added to or formed in the solutions: acids deprotonation, 33,34 iron hydrolysis, 35,36 polymerization of tungstate, 37 glycolate complexes with Fe and W [38][39][40][41] and metal complexes with citrate; [42][43][44][45] (ii) the mass balance equations…”

Section: Methodsmentioning

confidence: 99%

Fe (III)-Based Ammonia-Free Bath for Electrodeposition of Fe-W Alloys

Nicolenco

Цынцару

Cesiulis

2017

J. Electrochem. Soc.

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Electrodeposited Fe-W alloys are the subject of extensive studies to be applied in versatile engineering applications, and many solutions based on Fe(II) complexes are described for their deposition. However, in aqueous solutions containing dissolved oxygen, Fe(II) compounds are unstable thermodynamically and tend to oxidize to Fe(III) state that decreases the sustainability of the baths. The aim of the present study was to develop an environment-friendly and thermodynamically stable Fe(III)-based electrolyte for electrodeposition of Fe-W alloys with tunable composition. It was found that: (i) concurrent use of two complexing agents as citric and glycolic acids stabilizes Fe(III)-based bath in neutral and weak alkaline medium (no precipitates are formed); (ii) the current efficiency of the process can reach up to 60-70%, which has never been reported before for Fe-W alloys electrodeposition; (iii) nanocrystalline Fe-W coatings containing 11-24 at.% of W can be obtained from Fe(III)-based glycolate-citrate bath at temperature range 20-65 • C. The increase in tungsten content in the alloy resulted in decreased grain size up to < 5 nm; (iv) smooth, free of cracks and having deposition rates up to 0.18 μm/cm 1 alloys are successfully electrodeposited at elevated temperatures from elaborated glycolate-citrate electrolyte.

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“…Formation of various mono-and polynuclear complexes involving W(VI) or Mo(VI) as the central ion and D-gluconic [20], L-mannonic [21], D-galactonic [22], D-galacturonic [23], D-glucuronic [23], D-galactaric [24], and D-mannaric [24] acid as ligands was investigated by NMR previously. Complex formation of organic hydroxy acids (citric [25], lactic [26], and mandelic [27] acid) with tungstate or molybdate was investigated using potentiometric and enthalpimetric titrations. Amin et al [28] investigated complexation equilibria between quinolone ligands (ciprofloxacin, ofloxacin, and norfloxacin) and tungstate, molybdate, or vanadate.…”

Section: Introductionmentioning

confidence: 99%

Tungstate as complex‐forming reagent facilitating separation of selected polyphenols by capillary electrophoresis and its comparison with borate

et al. 2008

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A novel electrophoretic BGE containing tungstate as complex-forming reagent is suitable for the separation of polyphenols. Similar to molybdate-containing BGE reported earlier (cf. M. Polásek, et al.., Talanta 2006, 69, 192) addition of tungstate to BGE affects significantly migration of compounds/ligands with vicinal -OH groups due to the formation of negatively charged complexes involving W(VI) as central ion. Baseline separation of mixtures of flavonoids (apigenin, luteolin, hyperoside, quercetin, and rutin) and phenolic acids (chlorogenic and p-coumaric acid) was achieved within 15 min with optimized BGE of pH 7.4 containing 50 mM N-(2-hydroxyethyl)piperazine-2'-(2-ethanesulfonic acid) (HEPES), 2.2 mM tungstate, and 25% v/v of methanol. The separation was performed in a 75 cm (effective length 42 cm)x 75 microm id uncoated fused-silica capillary at 30 kV with spectrophotometric detection at 275 nm. The calibration curves were rectilinear for 25-175 microg/mL of all analytes (cinnamic acid as the internal standard). The LODs ranged from 1.8 to 6 microg/mL for all analytes except for chlorogenic acid. Intraday precision (n = 6) of migration times (RSD < or = 1.2%) and peak areas (RSD < or = 5.6%) was evaluated. The tungstate-based BGEs can be alternatively utilized for the analysis of polyphenols at considerably lower pH than with conventional alkaline borate-based BGEs.

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Complexation of tungsten(VI) with citrate

Cited by 62 publications

References 14 publications

Syntheses, crystal structures and biological relevance of glycolato and S-lactato molybdates

Syntheses, crystal structures and biological relevance of glycolato and S-lactato molybdates

Fe (III)-Based Ammonia-Free Bath for Electrodeposition of Fe-W Alloys

Tungstate as complex‐forming reagent facilitating separation of selected polyphenols by capillary electrophoresis and its comparison with borate

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