NOPR Collection:

Flow injection determination of ultra trace amounts of rhodium(III) with spectrophotometric detection

Thu, 01 Feb 2001 00:00:00 GMT

Title: Flow injection determination of ultra trace amounts of rhodium(III) with spectrophotometric detection Authors: Ensafi, Ali A; Mansour, H R; Chamjangali, M Arab Abstract: A flow injection method for determination for rhodium (III) has been developed based on its catalytic effect on the oxidation of Nile Blue by periodate at pH 9.20. The react ion was monitored spectrophotometrically at 630 nm. The effects of reagent concentration and manifold variables were studied and optimized. The method is linear in the range of 0.030-30.0 μg.ml^-1 Rh(III).The effects of interfering ions on the determination of Rh(III) have been studied. The proposed method has been used for the determination of rhodium(III) in synthetic samples with satisfactory results. Page(s): 222-224

Macrocycle-selective extractant for Pt (II) from aqueous metal solutions

Thu, 01 Feb 2001 00:00:00 GMT

Title: Macrocycle-selective extractant for Pt (II) from aqueous metal solutions Authors: Singh, Randhir; Bhattacharya, Amarendra; Sharma, Mamta Abstract: Dioxodimethyl macrocyclic ligand (A) has been used for selective extraction of platinum (II) from aqueous metal ion mixture. This is achieved by utilizing unique complexation properties of macrocyclic ligand (A) in the presence of sodium thiosulphate and showed very good results for the extraction of Pt (II). Page(s): 219-221

Synthesis and characterization of some imidazolium complexes of rhodium

Thu, 01 Feb 2001 00:00:00 GMT

Title: Synthesis and characterization of some imidazolium complexes of rhodium Authors: Borah, Geetika; Bora, Tankeswar Abstract: Rhodium(III) chloride is found to form complexes of the types (LH)₂[RhCl₅L].2H₂O, (LH)₂[RhCl₄L'2).2H₂O and (L'H)[RhCl₄L'₂], where L = 2-methylimidazole(2-Melm), 1 ,2- dimethylimidazole (1,2-Me₂Im) ; L' = imidazole (Im), 1-n-butylimidazole (1-n-BuIm). The compounds have been characterized by elemental analyses, molar conductance measurements, IR, UV-visible and ¹H NMR spectral studies. The compounds have octahedral geometry with pyridine nitrogen of imidazoles as donor site. Thermal studies indicate continuous loss of ligands with formation of Rh₂O₃ above 780°C. Page(s): 216-218

Synthesis and characterization of novel chiral organotin complexes

Thu, 01 Feb 2001 00:00:00 GMT

Title: Synthesis and characterization of novel chiral organotin complexes Authors: Arjmand, Farukh; Athar, Fareeda Abstract: Novel chiral complexes of organotin have been synthesized using amino acids as chiral auxiliary and 1,10-phenanthroline as a secondary ligand. A series of di-and tri-organotin (IV) [LSnR_nL'] complexes where n = 2 or 3, L=1-amino acids like tryptophan, leucine and valine and L'= 1,10-phenanthroline, have been prepared and characterized by conventional methods. Structure elucidation has been done by IR, UV, ¹H, ¹³C, ¹¹⁹Sn NMR spectroscopy. All the complexes are air stable and non-electrolytic in nature. On the basis of spectral evidences, it has been concluded that the carboxylic acid of the !-amino acid is behaving as a monodentate ligand in all these complexes and the complexes are octahedral in shape with a coordination number six around the tin atom. Page(s): 213-215