NOPR Collection:

Separation of gold and silver using a chelating resin - Thiosemicarbazide incorporated Amberlite IRC-50

2013-07-29T16:40:29Z

Title: Separation of gold and silver using a chelating resin - Thiosemicarbazide incorporated Amberlite IRC-50 Authors: Roy, Kamalika; Basu, S Abstract: A thiosemicarbazide group incorporated into a weakly acidic resin, Amberlite IRC-50 can selectively entrap two noble metals, gold and silver. The exchange capacity of the newly formed resin for Au(III) and Ag(I) is satisfactory. The resin can be utilized for the separation of these noble metals from different complex matrices. Page(s): 531-534

Pulse polarographic determination of organoisothiocyanates and a method for the analysis of Ditrapex

2013-08-05T16:42:27Z

Title: Pulse polarographic determination of organoisothiocyanates and a method for the analysis of Ditrapex Authors: Verma, B C; Chauhan, Chetan; Thakur, Lata; Sharma, D K Abstract: Pulse polarographic analysis shows that in acetonitrile medium, n-butylamine transforms organoisothiocyanates quantitatively into the corresponding thiourea derivatives which yield well-defined diffusion controlled anodic waves in the presence of aqueous sulphuric acid (pH 2-3) and potassium perchlorate (supporting electrolyte). The method has been successfully adapted for the analysis of Ditrapex, an insecticide formulation containing methyl isothiocyanate. Page(s): 529-530

Kinetic determination of traces of Al(III) ion by its catalytic effect on oxidation of 4-hydroxycoumarin by potassium permanganate

2013-07-26T16:39:33Z

Title: Kinetic determination of traces of Al(III) ion by its catalytic effect on oxidation of 4-hydroxycoumarin by potassium permanganate Authors: Igov, R P; Simonovic, R M; Pecev, T G; Yeselinovic, B B Abstract: Oxidation of 4-hydroxycoumarin by potassium permanganate in acid media of acetate buffer is catalyzed by Al(III) ions, which is the basis of the proposed new homogenocaralytic method for determinati on of Al(III) in solutions. Under the optimum conditions, Al(III) has been determined at 525 nm in solutions containing analyte at 50-1000 ng/ml with probable relative error of 15.6-5.1 % and detect ion limit of 20 ng/ml. Appropriate kinetic equations for both catalytic and noncatalytic processes have been derived and the mechanism of catalytic effect of Al(III) investigated. Interference studies show that most of the common cat ions and anions do not interfere. Page(s): 526-528

Ruthenium complexes containing bridging dppm and benzene-1, 2-dithiolato ligands: X-ray crystal structure of [Ru₂(CO)₄ {μ-S(C₆H₄)S} (μ-dppm)]

2013-07-27T16:39:38Z

Title: Ruthenium complexes containing bridging dppm and benzene-1, 2-dithiolato ligands: X-ray crystal structure of [Ru₂(CO)₄ {μ-S(C₆H₄)S} (μ-dppm)] Authors: Begum, Noorjahan; Hyder, Md Iqbal; Kabir, Shariff E; Kundu, Kalipada Abstract: The reaction of benzene-1,2-dithiol with [Ru₃(CO)₁₀(μ-dppm)] 1 in refluxing THF afforded two new compounds [Ru₂(CO)₄ {μ-S(C₆H₄)S}(μ-dppm)] 2 and [Ru₃(CO₈{μ-S(C₆H₄)S}(μ-dppm)] 3 which were characterized by elemental analysis, infrared, ¹H and ³¹P{¹H} NMR and mass spectra. The structure of 2 was determined by single crystal X-ray diffraction analysis. The compound crystallizes in the monoclinic space group P2₁/n, with a= 1 0.3133(2), b= 16.9806(3), c= 19.5605(3) Å, α=90, β=100.2298(11), γ=90°, V=3371.10(10) Å³ and Z=4. Both Ru atoms are in distorted octahedral geometry. For each ruthenium, two CO groups in cis positions, one bridged S atom and the other bonded Ru atom occupy the equatorial sites, and the other bridged S atom and a P atom of the bridging dppm ligand are in trans positions on the meridional axis. Of the two S atoms, one lies in the Ru₂P₂ plane while the other is perpendicular to this plane, thus making them nonequivalent but keeping the two P atoms of the bridging dppm ligand identical. The 50-electron compound 3 contains a doubly briddging dithiolato and a bridging dppm ligand. Protonation of 2 with trifluroacetic acid results in the formation of the cationic hydrido species [(μ-H)Ru₂(CO)₄ {μ-S(C₆H₄)S} (μ-dppm)]⁺ which has been characterized by spectroscopic data. Page(s): 521-525

NOPR Collection:

Separation of gold and silver using a chelating resin - Thiosemicarbazide incorporated Amberlite IRC-50

Pulse polarographic determination of organoisothiocyanates and a method for the analysis of Ditrapex

Kinetic determination of traces of Al(III) ion by its catalytic effect on oxidation of 4-hydroxycoumarin by potassium permanganate

Ruthenium complexes containing bridging dppm and benzene-1, 2-dithiolato ligands: X-ray crystal structure of [Ru2(CO)4 {μ-S(C6H4)S} (μ-dppm)]

Ruthenium complexes containing bridging dppm and benzene-1, 2-dithiolato ligands: X-ray crystal structure of [Ru₂(CO)₄ {μ-S(C₆H₄)S} (μ-dppm)]