NOPR Collection:

Semi-empirical and ab initio studies on the structure and polarizability of C₆₀, C₇₀ and C₈₄

Sun, 01 Jul 2001 00:00:00 GMT

Title: Semi-empirical and ab initio studies on the structure and polarizability of C₆₀, C₇₀ and C₈₄ Authors: Semwal, R P; Balodi, J P Abstract: The polarizabilities of a number of aromatic hydrocarbons and the three fullerenes (C₆₀, C₇₀ and C₈₄) have been calculated using a new empirical approach based on the square of the sum of the atomic hybrid components(τ _A) as given by the relation α_(abc)= (Å³) where the summation proceeds over all atoms A= 1,2,3---, and N is the total number of electrons in the molecule. The geometries have also been optimized. Page(s): 687-692

Spectrophotometric determination of trace amounts of cadmium using m-nitrobenzenediazoaminoazobenzene

Sun, 01 Jul 2001 00:00:00 GMT

Title: Spectrophotometric determination of trace amounts of cadmium using m-nitrobenzenediazoaminoazobenzene Authors: Gao, Hong-Wen; Tao, Mei Abstract: The spectral correction technique has been applied for the determination of cadmium using m-nitrobenzenediazoaminoazobenzene (m-NBDA). The composition ratio, real absorptivity and stepwise stability constant of the Cd-m-NBDA complex have been studied. The ratio of Cd to m-NBDA is found to be 1:3, its cumulative stability constant is 9.30×10¹⁸ and its real absorptivity is 1.36×10⁵ mol^-1cm^-1 at 460 nm. Beer's law is obeyed over the range of 0 - 25μ g Cd(II)/25ml, the detection limit of cadmium is found to be 0.006 mg/l and the relative standard deviation is 4.5%. Page(s): 780-784

Synthesis and spectral studies on chromium(III), manganese(II), iron(III), cobalt(II), nickel(II) and copper(II) complexes of fourteen-membered and sixteen membered tetradentate macrocyclic ligands

Sun, 01 Jul 2001 00:00:00 GMT

Title: Synthesis and spectral studies on chromium(III), manganese(II), iron(III), cobalt(II), nickel(II) and copper(II) complexes of fourteen-membered and sixteen membered tetradentate macrocyclic ligands Authors: Chandra, Sulekh; Gupta, Karuna Abstract: Complexes of Cr(III), Mn(II), Fe(III), Co(II), Ni(II) and Cu(II) with a 14- and 16- membered macrocyclic ligands have been prepared and characterized by elemental analyses, molar conductance, magnetic moment, infrared , electronic and EPR spectral studies. All the complexes are found to have six-coordinate geometry and are of the high-spin type. Page(s): 775-779

Synthesis, reactions, and spectral [NMR(¹H,¹³C, and ²⁹Si), IR] studies of organosilicon aryloxides

Sun, 01 Jul 2001 00:00:00 GMT

Title: Synthesis, reactions, and spectral [NMR(¹H,¹³C, and ²⁹Si), IR] studies of organosilicon aryloxides Authors: Mishra, Shashank; Singh, Anirudh Abstract: Organosilicon aryloxides of the types Me₃Si(OAr) and MeSi(OAr)₃ (Ar = C₆H₄Bu^s -2; C₆H₃Me-2-Pr¹-5; C₆H₃Me-5-Pr^l-2) have been prepared, respectively, from reactions of appropriate phenols with Me₃SiCl or MeSiCl₃ in benzene using Et₃N as a base. Reactions of Me₃Si(OAr) with TiCl₄ in 1:1 and 2: 1 molar ratios in benzene afford derivatives TiCl₃(OAr) and TiCl₂(OAr)₂, respectively. All these new derivatives have been characterized by elemental analyses, spectroscopic [IR, NMR (¹H, ¹³C, and ²⁹Si)] studies, as well as by molecular weight measurements. Page(s): 772-774

NOPR Collection:

Semi-empirical and ab initio studies on the structure and polarizability of C60, C70 and C84

Spectrophotometric determination of trace amounts of cadmium using m-nitrobenzenediazoaminoazobenzene

Synthesis and spectral studies on chromium(III), manganese(II), iron(III), cobalt(II), nickel(II) and copper(II) complexes of fourteen-membered and sixteen membered tetradentate macrocyclic ligands

Synthesis, reactions, and spectral [NMR(1H,13C, and 29Si), IR] studies of organosilicon aryloxides

Semi-empirical and ab initio studies on the structure and polarizability of C₆₀, C₇₀ and C₈₄

Synthesis, reactions, and spectral [NMR(¹H,¹³C, and ²⁹Si), IR] studies of organosilicon aryloxides