Estimation of vanadium in different oxidation states

Mittal, R. K.; Mehrotra, R. C.

doi:10.1007/bf00520599

Cited by 6 publications

(3 citation statements)

References 1 publication

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“…The presence of VSO 4 can be ascertained by standard titration using a ferric salt solution in the presence of neutral red as a visual indicator, according to the method of Mittal and Mehrotra [ 37 ]. The solution of VSO 4 , when extracted from the electrolytic bath, must be used at once in Reaction (1) or stored in a reservoir out of air contact.…”

Section: Methodsmentioning

confidence: 99%

Synthesis of Copper Nanoparticles in Ethylene Glycol by Chemical Reduction with Vanadium (+2) Salts

et al. 2016

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Copper nanoparticles have been synthesized in ethylene glycol (EG) using copper sulphate as a precursor and vanadium sulfate as an atypical reductant being active at room temperature. We have described a technique for a relatively simple preparation of such a reagent, which has been electrolytically produced without using standard procedures requiring an inert atmosphere and a mercury cathode. Several stabilizing agents have been tested and cationic capping agents have been discarded owing to the formation of complex compounds with copper ions leading to insoluble phases contaminating the metallic nanoparticles. The elemental copper nanoparticles, stabilized with polyvinylpyrrolidone (PVP) and sodium dodecyl sulphate (SDS), have been characterized for composition by energy dispersive X-ray spectroscopy (EDS), and for size by dynamic light scattering (DLS), and transmission electron microscopy (TEM), giving a size distribution in the range of 40–50 nm for both stabilizing agents. From a methodological point of view, the process described here may represent an alternative to other wet-chemical techniques for metal nanoparticle synthesis in non-aqueous media based on conventional organic or inorganic reductants.

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Section: Methodsmentioning

confidence: 99%

Synthesis of Copper Nanoparticles in Ethylene Glycol by Chemical Reduction with Vanadium (+2) Salts

et al. 2016

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“…Recrystallisation from a mixture of CH 2 Cl 2 and n-hexane gave an analytically pure product as a white solid (2. Vanadium was determined by the redox [28] titration method. Titanium, zirconium, niobium and tantalum were estimated gravimetrically [29] as their oxides.…”

Section: Methodsmentioning

confidence: 99%

Synthesis and characterisation of heterobimetallic N-(hydroxyethyl)-salicylaldiminate–isopropoxide complexes of oxovanadium(V)

Ghadwal

Singh

Mehrotra

2005

Transition Met Chem

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Soluble heterobimetallic-N-(hydroxyethyl) salicylaldiminate-alkoxide derivatives of the types [VO(L) 2 {M(OPr i ) n)1 }] [M ¼ Al (2) (n ¼ 3); Ti (3), Zr (4) (n ¼ 4); Nb (5), Ta (6) (n ¼ 5)], [where L represents the dianionic N-(hydroxyethyl) salicylaldiminate group bonded to vanadium in a tridentate fashion involving both the oxygen atoms and azomethine nitrogen], have been prepared by the reactions of insoluble [VO(L)(LH)](1) with different metal alkoxides in a 1:1 molar ratio in benzene. A monomeric heterobinuclear complex of the type [VO(g 3 -L)(l-OPr i ) 2 Al(g 3 -L)] (7) has been prepared by the equimolar reaction of [VO(g 3 -L)(l-OPr i )] 2 with [Al(g 3 -L) (l-OPr i )] 2 in benzene. All these complexes have been characterised by elemental analyses, molecular weight measurements, and by spectroscopic (l.r., l H-, 27 Al-and 51 V-n.m.r.) studies. The monomeric nature of (1) and (2) has been supported by their FAB-mass spectral studies.

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“…13 Vanadium was determined by a redox titration method. 42 Ti, Zr, Nb, Ta and Si were estimated gravimetrically 43 as their oxides, whereas aluminium was determined as its oxinate. Nitrogen was determined by Kjeldahl's method.…”

Section: Methodsmentioning

confidence: 99%

Preparation and Spectroscopic Characterisation of a Series of Heterobimetallic N-phenyldiethanolaminate-alkoxide Derivatives of Oxovanadium(V)

Ghadwal

Mehrotra²,

Singh

2005

Journal of Chemical Research

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Reaction of VO(OPri)3 with two equivalents of N-phenyldiethanolamine (PhDEAH2) yields a homometallic complex [VO(PhDEA)(PhDEAH)] 1, which reacts with a number of metal alkoxides to afford heterobimetallic oxovanadium(V) complexes of the types [VO(PhDEA)2{M(OR)n-1}] [where PhDEA = C6H5N(CH2CH2O–)2], [M =: Al (n = 3, R = Pri) 2; Al (n = 3, R = But) 3; Ti (n = 4, R = Pri) 4; Zr (n = 4, R = Pri) 5; Nb (n = 5, R = Pri) 6; Ta (n = 5, R = Pri) 7. The derivative [VO(PhDEA)(OSiPh3)] 8 has been prepared by the equimolar interaction of [VO(PhDEA)(OPri)] with Ph3SiOH. All of these complexes have been characterised by spectroscopic (IR; 1H, 13C, 27Al and 51V NMR) studies, elemental analyses, and molecular weight measurements. The derivative 2 has also been characterised by FAB mass spectral studies, which supports for its monomeric nature.

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Estimation of vanadium in different oxidation states

Cited by 6 publications

References 1 publication

Synthesis of Copper Nanoparticles in Ethylene Glycol by Chemical Reduction with Vanadium (+2) Salts

Synthesis of Copper Nanoparticles in Ethylene Glycol by Chemical Reduction with Vanadium (+2) Salts

Synthesis and characterisation of heterobimetallic N-(hydroxyethyl)-salicylaldiminate–isopropoxide complexes of oxovanadium(V)

Preparation and Spectroscopic Characterisation of a Series of Heterobimetallic N-phenyldiethanolaminate-alkoxide Derivatives of Oxovanadium(V)

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