http://nopr.niscpr.res.in/handle/123456789/18292 Sun, 11 Oct 2026 06:48:38 GMT 2026-10-11T06:48:38Z http://nopr.niscpr.res.in/handle/123456789/18478 Title: Industrial applications of near infra-red spectroscopy: Quality evaluation of naphtha feed for olefin production Authors: Pandey, G C; Kumar, Ajay; Garg, R K Abstract: In an attempt to develop an alternative, fast, simple and direct method for the measurements of various properties of naphtha, we report a method based on near infra-red (NIR) spectroscopy. The required parameters for quality evaluation of such feed include mainly aromatics, naphthenes (C₆-, i.e., components having carbon number 6 and below and C₇₊, i.e., those with carbon number 7 and above), paraffins (C₆<i>- </i>and C₇₊) and methylcyclohexane. The results obtained by the IR method show an excellent agreement with the currently accepted standard gas chromatography (GC) method. Page(s): 327-330 Thu, 01 Mar 2001 00:00:00 GMT http://nopr.niscpr.res.in/handle/123456789/18478 2001-03-01T00:00:00Z http://nopr.niscpr.res.in/handle/123456789/18477 Title: Spectrophotometric method for the determination of yttrium(III) and its application to the analysis of the superconductor, YBa₂CU₃Oy Authors: Sawant, Shilpa D; Sundaresan, R; Mathur, P K Abstract: A spectrophotometric procedure for the determination of yttrium(III) using Arsenazo-I is described (λ_max = 570 nm). The calibration curve is linear in the concentration range of 0-4×10^-6 <i>M</i> (0-356 ngml^-1). The lowest amount of ytt rium(III) that can be determined is 22 ngml^-1. The procedure has been applied for the determination of yttrium(III) in the superconductor, YBa₂CU₃Oy (y = 6.5-6.9), with good results. Page(s): 323-326 Thu, 01 Mar 2001 00:00:00 GMT http://nopr.niscpr.res.in/handle/123456789/18477 2001-03-01T00:00:00Z http://nopr.niscpr.res.in/handle/123456789/18476 Title: Synthesis and characterization of hydroxycarboxylato complexes of nickel(II) Authors: Baranwal, B P; Das, S S; Singh, Poonam; Gupta, Tarkeshwar Abstract: Acetate groups of anhydrous nickel(II) acetate have been substituted with some higher carboxylic acids and hydroxycarboxylic acids in toluene under reflux and the products Ni(OOCR)(OOCR'), Ni(OOCR) (OOCR") and Ni(OOCR)(OOCR"') [where R=C₁₃H₂₇, C₁₇H₃₅ or C₂₁H₄₃ and R'=C₆H₄OH, Rʹʹ = C₆H₅CH(OH) and R'" = (C₆H₅)₂C(OH)] obtained have been characterized by elemental analyses, electronic and IR spectra and conductivity measurements. An octahedral environment around nickel(II) ion is suggested and the molecular weight determinations confirm the dinuclear nature of these complexes. Page(s): 320-322 Thu, 01 Mar 2001 00:00:00 GMT http://nopr.niscpr.res.in/handle/123456789/18476 2001-03-01T00:00:00Z http://nopr.niscpr.res.in/handle/123456789/18475 Title: Synthesis and characterisation of dicopper(II) complexes with N,N,N',N',N"-pentakis(benzimidazol-2-yl methyl) diethylenetriamine Authors: Nohria, Lata; Gupta, Manisha; Mathur, Pavan Abstract: Dicopper (II) complexes with an octadentate chelating ligand N,N,N',N',N"-pentakis(benzimidazol-2-yl methyl) diethylenetriamine [DTPB] have been synthesized and characterised. Cyclic voltammetric studies reveal the existence of two distinct quasireversible couples, a feature supporting the presence of two copper (II) ions in the binucleating ligand cavity. Low temperature X-band EPR studies provide support for a weak magnetic exchange interaction between the two copper (II) ions via the ligand bridge. Room temperature magnetic moment data also support the above formulation. Page(s): 316-319 Thu, 01 Mar 2001 00:00:00 GMT http://nopr.niscpr.res.in/handle/123456789/18475 2001-03-01T00:00:00Z