NOPR Collection:

Solvent extraction and determination of scandium(III) with Cyanex272 as an extractant

2006-12-01T00:00:00Z

Title: Solvent extraction and determination of scandium(III) with Cyanex272 as an extractant Authors: Karve, Manjusha; Vaidya, Bhagyashree Abstract: A novel method for the solvent extraction separation of scandium (III) at pH 5.0 using 5×10^-4 M Cyanex272 has been developed. Scandium(III) has been stripped from the organic phase with 1.0 M HNO₃ and determined spectrophotometrically as its complex with Arsenazo(III) a 675 nm . The method developed has been applied for selective separation of scandium(III) from some closely associated elements. viz ., La (III), Y(III), Ce(IV), Zr(IV), Dy(III), Nd (III), Pr(III), Yb(III). etc. in their binary mixtures. The method permits mutual separation of scandium(III)yttrium(III)-lanthanum(III) and scandium(III)-yttrium(III)cerium (IV) and for recovery of scandium(III) from USGS standard soil sample GXR-2, Japanese stream sediment sample Jsd-3 and ashes from Hutti gold mines in Karnataka, The method presented is simple, rapid and selective for isolation of scandium(III) from complex mixtures. The method developed is reproducible with a relative standard deviation of 0.4%. Page(s): 2658-2660

Densities, viscosities and excess thermodynamic properties of ternary liquid mixtures of nitrobenzene with polar and non-polar solvents at 298.15 K

2006-12-01T00:00:00Z

Title: Densities, viscosities and excess thermodynamic properties of ternary liquid mixtures of nitrobenzene with polar and non-polar solvents at 298.15 K Authors: Rathore, Poonam; Singh, Mukhtar Abstract: Densities and viscosities of ternary liquid mixtures of nitro benzene + methyl alcohol + (benzene; + toluene; + carbon tetrachloride; + 1,4-dioxane) have been determined at 298.15 K. From density and viscosity data, values of viscosity deviations and thermodynamic excess properties, viz .., excess molar volume and excess Gibbs free energy o f activation of viscous flow for the ternary mixtures have been determined and fitted to Cibulka's equation. The results of the study show that experimental values of these properties are in close agreement with those predicted by Cibulka's equation. Page(s): 2650-2657

Synthesis and spectroscopic characterization of mixed ligand complexes of oxovanadium(V)

2006-12-01T00:00:00Z

Title: Synthesis and spectroscopic characterization of mixed ligand complexes of oxovanadium(V) Authors: Ghadwal, Rajendra Singh; Singh, Anirudh Abstract: Equimolar reaction of VO(OPr^J)₃ witli N phenyldiethanolamine affords [VO (L)(μ- OPr^J)]₂ (l), which reacts with a variety of mono- and bi -dentate ligands such as MeOH, EtOH, MeOCH₂CH₂OH, MeNHCH₂CH₂OH, Me₃CCH₂OH, Me₃COH, EtCMe₂OH, and C₁₀H₇N=CHC₆H₄OH (where C₁₀H₇ represents napthyl group) yielding the dimeric [VO(L)(μ-OMe)]₂(2) [VO(L)(μ-OEt)]₂ (3), [VO(L)(μ-O CH₂CH₂OMe)]₂ (4),[VO( L)(μ-OCH₂OCH₂NHMe)]₂(5) , [VO( L)(μ-OC H₂CMe₃)]₂ (6 ), [VO( L)(μ-OCMe₃)]₂(7), [VO( L)(μ-OCMe₂Et]₂ (8), and the monomeric complexes, [VO(L)(OC₆H₄CHNC₁₀H₇)](9), respectively. A detailed study of alcoholysis reactions of VO(L)( OPr^J) with a number of monofunctional alcohols indicates the following order of reactivity: OMe > OEt ≈ OCH₂CH₂OMe ≈ OCH₂CH₂NHMe > OCH₂CMe₃ > OCMe₃ > OCMe₂ Et. All of these complexes have been characterized by elemental analyses, molecular weight measurements and speclroscopic (IR, ¹H and ⁵¹V NMR) studies, on the basis of which plausible structures have been suggested for the novel complexes. Page(s): 2644-2649

Synthesis and spectroscopic characterisation of new types of mixed ligand homo- and heterobimetallic derivatives of butyltin(IV)

2006-12-01T00:00:00Z

Title: Synthesis and spectroscopic characterisation of new types of mixed ligand homo- and heterobimetallic derivatives of butyltin(IV) Authors: Sharma, Nandu Bala; Singh, Anirudh Abstract: Interaction in equimolar ratio of BuSn(OPr¹)₃ with an appropriate Schiff base ( L¹H₂ or L²H₂), where L¹= OC₁₀ H₆CH=NCH₂ CH₂ O and L² = CH₃C(O)CHC (=NCH₂ CH₂ O)CH₃) yields compounds (1) or (2) respectively, which on reaction with glycols in equimolar ratios afford mixed-ligand derivatives BuSn (L)(OGOH) [where L = L¹, G = CHCH₃ CHCH₃ (G¹) (3); L= L¹ , G = C(CH₃)₂ C(CH₃)₂ (G²) (4) and L = L², G = G¹ (5)]. Equimolar reactions of (3)-(5) with Al(OPr¹)₃ afford heterobimetallic derivatives of the type buSn (L)(OGOAL(OPr¹)₂) (where L = L¹, G = G¹ (6); L = L¹, G = G¹ (7): and L = L², G = G¹ (8)) . All these derivatives (1)-(8) have been characterised by elemental analyses, molecular weight measurements and spectroscopic [IR, and NMR (¹H ¹¹⁹Sn and ²⁷Al )] studies. Page(s): 2638-2643