Browsing Chemistry by Title
Now showing items 1-20 of 240
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1,8-Dihydroxyanthraquinone anchored on silica gel: synthesis and application as solid phase extractant for lead(II), zinc(II) and cadmium(II) prior to their determination by flame atomic absorption spectrometry
(2002)A new chelating matrix has been prepared by immobilizing 1,8-dihydroxyanthraquinone (DHAQ) on silica gel modified with (3-aminopropyl)triethoxysilane. After characterizing the matrix with thermogravimetric analysis (TGA), ... -
1D and 2D NMR studies of N-vinylcarbazole/butyl methacrylate copolymers
(2003)Copolymers containing N-vinylcarbazole (V) and butyl methacrylate (B) units of different compositions were synthesized and their compositions were determined from quantitative 13C{1H} NMR spectroscopy. The reactivity ratios ... -
2-(2-{Diphenylarsino}ethyl)-1,3-dioxane (L1) and 2-(diphenylarsinomethyl)tetrahydrofuran (L2) and their palladium(II), platinum(II) and mercury(II) complexes: synthesis and crystal structures of [PdBr2(L1)2] and [HgBr2(L2)]2
(1999)Novel and potentially hemilabile ligands of (As, O) type, 2-(2-{diphenylarsino}ethyl)-1,3-dioxane (L1) and 2- diphenylarsinomethyl)tetrahydrofuran (L2), are synthesised by reacting Ph2AsLi generated in situ under a nitrogen ... -
2-(4-Ethoxyphenlytelluromethyl)tetrahydro-2H-pyran (L1) and 2-(2-{4-ethoxyphenyl}telluroethyl)-1,3-dioxane (L2): synthesis, reactions of L1 with iodine and ligation of L1 with Ru(II), Cu(I), and Hg(II) and L2 with Ru(II). Crystal structures of [RuCl2(p-cymene)·L1/L2]
(2001)2-(4-Ethoxyphenlytelluromethyl)tetrahydro-2H-pyran (L1) and 2-(2-{4-ethoxyphenyl}telluroethyl)-1,3-dioxane (L2) have been synthesized by reacting in situ generated ArTe−Na+ with an appropriate organic halide. The reaction ... -
2-(Phenyltelluromethyl)tetrahydrofuran (L1) and 2-(2-{4-methoxyphenyl}telluroethyl)-1,3- dioxolane (L2) and their palladium(II) and platinum(II) complexes
(1997)The nucleophile [ArTe-] generated/n situ borohydride solution of Ar2Te2, reacts with 2-(chloro-methyl)tetrahydrofuran and 2-(2-bromoethyl)- 1,3-dioxolane resulting in L and L 2, respectively. The complexes of palladium(II) ... -
2-[2-(4-Methoxyphenyltelluro)ethyl]thiophene (L1) bis[2-(2-thienyl)ethyl] telluride (L2) and their metal complexes; crystal structure of trans-dichlorobis{2-(2-(4-methoxyphenyltelluro)ethyl)thiophene-Te} palladium(II) and {bis[2-(2-thienyl)ethyl] telluride}dichloro(p-cymene)ruthenium(II)
(2004)The reaction of ArTe− (Ar=4-MeOC6H4) and Te2− generated in situ by borohydride reduction of Ar2Te2 and Te, respectively, with 2-(2-thienyl)ethyl chloride has resulted in 2-[2-(4-methoxyphenyltelluro)ethyl]thiophene (L1) ... -
3-(4-Methoxyphenyltelluoro)propane-1,2-diol—synthesis and reactions with mercury(II), palladium(II) and platinum(II) halides
(1994)The reaction of ArTe− Na+ (Ar = 4-MeOC6H5), generated in situ by borohydride reduction of Ar2Te2 under a nitrogen atmosphere, with CH2OH·CHOH·CH2Cl gave 3-(40methoxyphenyltelluro)propane-1,2-diol (1). The reactions of 1 ... -
8-Hydroxyquinoline anchored to silica gel via new moderate size linker: synthesis and applications as a metal ion collector for their flame atomic absorption spectrometric determination
(2003)The silica gel modified with (3-aminopropyl-triethoxysilane) was reacted with 5-formyl-8-hydroxyquinoline (FHOQx) to anchor 8-quinolinol ligand on the silica gel. It was characterised with cross polarisation magic angle ... -
Affinity precipitation of aspergillus niger pectinase by microwave-treated alginate
(2004)Affinity precipitation is a simple, single plate separation process in which the complex of a smart macroaffinity ligand with the target protein (from a crude broth) can be selectively precipitated by application of a ... -
Affinity precipitation of trypsin with soybean trypsin inhibitor linked Eudragit S-100
(1994)Soybean trypsin inhibitor linked to Eudragit S-100 was used for the affinity precipitation of trypsin. Polymer and ligand concentrations used in conjugate preparation showed remarkable effect on the trypsin recovery. Trypsin ... -
Amberlite XAD-2 functionalized with o-aminophenol: synthesis and applications as extractant for copper(II), cobalt(II), cadmium(II), nickel(II), zinc(II) and lead(II)
(2000)A stable chelating resin matrix was synthesized by covalently linking o-aminophenol (o-AP) with the benzene ring of the polystyrene–divinylbenzene resin, Amberlite XAD-2, through a –N=N– group. Elemental analyses, ... -
Amorphous enzyme aggregates: stability toward heat and aqueous-organic cosolvent mixtures
(1999)Chemical aggregates of four enzymes, i.e., polyphenol oxidase, acid phosphatase, β-glucosidase, and trypsin have been prepared by chemical cross-linking with glutaraldehyde. These aggregates were characterized for their ... -
Analysis of quaternary carbon resonances of vinylidene chloride/methyl acrylate copolymers
(2004)Analysis of the quaternary carbon resonance signals of vinylidene chloride in vinylidene chloride (V)/methyl acrylate (M) copolymers at pentad level of compositional sensitivity is presented in this paper. The analysis has ... -
Antimicrobial activity of some natural dyes
(2005)The present study was taken up as an exploratory study to test if some natural dyes have inherent antimicrobial activity with a view to develop protective clothing from these. Four natural dyes Acacia catechu, Kerria lacca, ... -
Application of polyaniline-Langmuir-Blodgett films as a glucose biosensor
(1995)Langmuir-Blodgett films of the polyemeraldine base form of polyaniline (PANI) have been successfully deposited on an indium tin oxide (ITO) coated glass surface. The enzyme glucose oxidase (GOX) was entrapped between the ... -
Asymmetric diorganotellurides containing substituted pyridyl groups—synthesis and ligation with palladium(II) and platinum(II). Crystal structure of [Pd{4-MeC6H4Te CH2CH2-2-(C5H4N)} Cl2] · 2CHCl3
(1997)A (N,Te,N) ligand 2-(2-pyridoethyletelluro)ethylpyridine (1) has been synthesized by reacting in situ generated Na2Te with 2-(2-chloroethyl)pyridine. The PdII and PtII complexes of stoichiometry [MCl·1]Cl have been studied. ... -
Ba3ZnTa2−xNbxO9 and Ba3MgTa2−xNbxO9 (0≤x≤1): synthesis, structure and dielectric properties
(2002)Oxides belonging to the families Ba3ZnTa2−xNbxO9 and Ba3MgTa2−xNbxO9 were synthesized by the solid state reaction route. Sintering temperatures of 1300°C led to oxides with disordered (cubic) perovskite structure. However, ... -
Ba3ZnTa2−xNbxO9 and Ba3MgTa2−xNbxO9: synthesis, structural and dielectric studies
(2000)Oxides of the families Ba3ZnTa2−xNbxO9 and Ba3MgTa2−xNbxO9 were obtained by the solid state reaction route at 1573 K and were found to crystallize in the disordered (cubic) perovskite structure. In Ba3ZnTa2−xNbxO9 and ... -
Benzoquinone modified electrode for sensing NADH and ascorbic acid
(1998)A benzoquinone modified basal plane pyrolytic graphite electrode shows electrocatalytic activity for the oxidation of NADH and ascorbic acid in phosphate buffer (pH 7.3). The modified electrode shows a linear variation of ...