Browsing Chemistry by Issue Date
Now showing items 1-20 of 240
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Determination by 13C-NMR spectroscopy of the microstructure of copolymers of acrylic acid with vinyl acetate
(1991)Acrylic acid-vinyl acetate copolymers were prepared in bulk using benzoyl peroxide as initiator. Copolymer compositions were determined by volumetric titration; monomer reactivity ratios were determined by the method of ... -
Regeneration of carbonyl compounds from semicarbazones by copper (II) chloride dihydrate
(1991)Semicarbazones are chemoselectively hydrolysed to carbonyl compounds in high yields by copper (II) chloride dihydrate on refluxing in acetonitrile. -
Electroless deposition of copper indium diselenide thin films
(1991)Thin films of copper indium diselenide are deposited on Ti substrates by a simple and inexpensive electroless technique. The compositional, structural and morphological properties of the as such and annealed films are ... -
Characterization of cadmium-doped copper indium sulphide films prepared by a two-step technique
(1991)Cadmium-doped CuInS2 films were prepared from electroless-deposited cadmium-doped films of CuIn alloy in H2S gas at 550 °C. The compositional, morphological, and photoelectrochemical properties of both doped and undoped ... -
Synthesis of [ArTe(DTC/XNT)(NaDTC/XNT)] (DTC = dithiocarbamate and XNT = xanthate) through ligand substitution reactions of arylbis(thiosemicarbazone)tellurium(II) chloride
(1992)[ArTe(XTSC)2]Cl (XTSC = benzaldehyde/salicylaldehyde thiosemicarbazone) reacts with sodium salts of dithiocarbamates (DTC) and xanthates (XNT) in a 1 : 2 molar ratio resulting in the formation of [ArTe(DTC/XNT)(NaDTC/XNT)]. ... -
Synthesis, magnetic and electrochemical properties of binuclear copper(II) complexes of pyridoxal hydrazones
(1992)Some new binuclear copper(II) complexes with pyridoxal benzoylhydrazone (PBH), pyridoxal o-hydroxylbenzoyl- hydrazone (PHBH), pyridoxal picolinoylhydrazone (PPH), pyridoxal nicotinoylhydrazone (PNH), and pyridoxal ... -
Column preconcentration of titanium in aluminium and zinc alloys with oxalic acid-ascorbic acid and the ion-pair of sodium 1,2-dihydroxybenzene-3,5-disulphonic acid and tetradecyldimethylbenzylammonium chloride supported on naphthalene using spectrometry
(1992)A solid ion-pair compound produced from sodium 1,2-dihydroxybenzene-3,5-disulphonic acid (Tiron) and tetradecyldimethylbenzylammonium chloride(TDBA) supported on naphthalene in a simple glass-tipped funnel tube provides a ... -
Crystal structures of triphenyltellurium(IV) methylxanthate and isobutylxanthate — dependence on the steric influence of the alkyl group of the xanthate system
(1992)The crystal structures of Ph3Te(μ-S2COMe)2TePh3 (1) and Ph3Te(S2CO(iBu)) (2) have been determined by X-ray diffraction. The two xanthate ligands bridge the two tellurium atoms in triphenyltellurium(IV) methylxanthate. The ... -
Production of biogas from Azolla pinnata R.Br and Lemna minor L.:Effect of heavy metal contamination
(1992)The absorption of iron, copper, cadmium, nickel, lead, zinc, manganese and cobalt by Azolla pinnata R.Br and Lemna minor L., and subsequent utilization of this biomass for production of biogas (methane), have been investigated. ... -
Photoelectrochemical behaviour of polypyrrole coated cadmium telluride
(1992)The electrochemical polymerization of pyrrole to polyprolle on the surface of single crystal cadmium telluride is faster and takes place at lower potential under illumination than in the dark due to photoproduced holes. ... -
Enantioselective synthesis and absolute configuration of myoporone
(1993)An enantioselective synthesis of myoporone has been accomplished in 91.7% e.e. to determine its absolute configuration. -
Enantioselective synthesis and absolute configuration of myoporone
(1993)An enantioselective synthesis of myoporone has been accomplished in 91.7% e.e. to determine its absolute configuration. -
Enantioselective synthesis and absolute configuration of myoporone
(1993)An enantioselective synthesis of myoporone has been accomplished in 91.7% e.e. to determine its absolute configuration. -
Peri-, regio- and stereoselectivities in thermal addition of tropone to allenic esters
(1993)Thermal addition of tropone to allenic esters (RR1C=C=CHCO2Et, Ia, R=R1=H; Ib, R=H, R1=CH3; Ic, R=H, R1=CH3CH2; Id, R=CH3, R1=CH3CH2) furnishes 4+2 cycloadducts as major products, unlike the reported additions of tropone ... -
Compositional sequence determination of acrylonitrile-butyl acrylate copolymers by 13C n.m.r. spectroscopy
(1993)Acrylonitrile-butyl acrylate (A/B) copolymers of different monomer compositions were prepared by bulk polymerization using a free radical initiator. Copolymer compositions were determined by elemental analyses and comonomer ... -
Synthesis and characterization of complexes of cobalt(II), nickel(II), zinc(II), cadmium(II) and mercury(II) with p-acetamidobenzaldehyde thiosemicarbazone
(1993)Some complexes of p-acetamidobenzaldehyde thiosemicarbazone (thiacetazone) with cobalt(II), nickel(II), zinc(II), cadmium(II) and mercury(II) have been prepared and their magnetic, spectral and thermal data suggest that ... -
Synthesis of new chromogenic calix(8)arenes
(1994)Synthesis of new chromogenic calix(8)arenes 3–10 through the coupling of diazotized 4,4′-diaminobiphenyl and octahydroxycalix(8)arenes is described. The synthesized derivatives provide an additional substructure and plausible ... -
NADH sensor with electrochemically modified TCNQ electrode
(1994)7,7,8,8-Tetracyanoquinodimethane (TCNQ) has been immobilized electrochemically on an edge plane pyrolytic graphite electrode. The electrode was immersed in a solution of TCNQ in acetonitrile and a voltage of 1.0 V vs. ... -
Electrochemical oxidation of L-ascorbic acid on 7,7,8,8-tetracyanoquinodimethane (TCNQ) modified electrode tetracyanoquinodimethane (TCNQ) modified electrode
(1994)A new chemically modified electrode for electrocatalytic oxidation of ascorbic acid is described. 7,7,8,8-Tetracyanoquinodimethane (TCNQ) is immobilised on edge plane pyrolytic graphite by immersing the electrode in a ...