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  • 1
    Digitale Medien
    Digitale Medien
    O-Ethyl and O-methyl N-(2,3,4,6-tetra-O-acetyl-β-D-glucopyranosyl)thiocarbamate (2001)
    Oxford [u.a.] : International Union of Crystallography (IUCr)
    Acta crystallographica 57 (2001), S. 566-568 
    Details
    ISSN: 1600-5759
    Quelle: Crystallography Journals Online : IUCR Backfile Archive 1948-2001
    Thema: Chemie und Pharmazie , Geologie und Paläontologie , Physik
    Notizen: In both the title structures, O-ethyl N-(2,3,4,6-tetra-O-acetyl-β-D-glucopyranosyl)thiocarbamate, C17H25NO10S, and O-methyl N-(2,3,4,6-tetra-O-acetyl-β-D-glucopyranosyl)thiocarbamate, C16H23NO10S, the hexopyranosyl ring adopts the 4C1 conformation. All the ring substituents are in equatorial positions. The acetoxymethyl group is in a gauche–gauche conformation. The S atom is in a synperiplanar conformation, while the C—N—C—O linkage is antiperiplanar. N—H...O intermolecular hydrogen bonds link the molecules into infinite chains and these are connected by C—H...O interactions.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1107/S0108270101000609
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  • 2
    Digitale Medien
    Digitale Medien
    Structure and characterization of O,O-diethylthiophosphorylhydrazine o-vanillin Schiff base nickel(II) complex: NiC24H36N4O8P2S2 (2000)
    Springer
    Journal of chemical crystallography 30 (2000), S. 463-467 
    Details
    ISSN: 1572-8854
    Schlagwort(e): Nickel complex ; phosphorylhydrazine ; Schiff base ; square-planar
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Geologie und Paläontologie , Physik
    Notizen: Abstract The crystal and molecular structure of the complex of Ni[(C2H5O)2PSNHNCPh(o-O)OMe]2 has been determined by X-ray crystallography. The compound crystallizes in the monoclinic system, space group P21/n, with lattice parameters a = 14.805(3), b = 7.9550(16), c = 15.176(3) Å, β = 117.94(3), and Z = 2. The unit cell contains two centrosymmetric molecules of O,O-diethylthiophosphorylhydrazine o-vanillin Schiff base nickel(II). The nickel(II) ion is coordinated in a slightly distorted trans square-planar configuration, the distortion consisting of a reduction of the N—Ni—O angle with the chelate rings from the ideal value of 90° to 87.69°. The coordination geometry of nickel(II) is square planar with two equivalent Ni—N and Ni—O bonds. The two phenyl rings and the phosphorylhydrazine moieties are in one plane forming an extensive delocalized system. Within each molecule, the two ligands are linked by a pair of N—H···O hydrogen bonding interactions. In the solid state, the title compound form a hydrogen bonding network through C—H···O intermolecular hydrogen bonding.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1023/A:1011351500225
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  • 3
    Digitale Medien
    Digitale Medien
    Reductive potentiometric stripping analysis of lead with potassium ferrocyanide as the reducing agent on a glassy carbon electrode (1995)
    Weinheim : Wiley-Blackwell
    Electroanalysis 7 (1995), S. 283-286 
    Details
    ISSN: 1040-0397
    Schlagwort(e): Reductive potentiometric stripping analysis ; Lead ; Potassium ferrocyanide ; Glassy carbon electrode ; Chemistry ; Polymer and Materials Science
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Chemie und Pharmazie
    Notizen: Reductive potentiometric stripping analysis (RPSA), with potassium ferrocyanide as the reducing agent on a glassy carbon electrode, is applied for the determination of lead over the range 2 × 10-8-5 × 10-6 M. The relative standard deviation of 2 × 10-6 M lead for ten consecutive measurements is 2.5%. This technique has been used to determine the minute amount of lead in a human hair sample solution.
    Zusätzliches Material: 4 Ill.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1002/elan.1140070316
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  • 4
    Digitale Medien
    Digitale Medien
    On the adsorption voltammetry of the boron-Beryllon III4-[(4-diethylamino-2-hydroxyphenyl)-azo]-5-hydroxy-naphtalene, 2,7-disurphonic acid. system: Part I. Determination of boron in plants and soils (1993)
    Weinheim : Wiley-Blackwell
    Electroanalysis 5 (1993), S. 437-443 
    Details
    ISSN: 1040-0397
    Schlagwort(e): Boron ; Adsorption voltammetry ; Beryllon III ; Chemistry ; Polymer and Materials Science
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Chemie und Pharmazie
    Notizen: A very sensitive electrochemical adsorptive voltammetric procedure for trace measurements of boron(III) in plants and soils is described. The complex of boron(III) with Beryllon III is adsorbed on a dropping mercury electrode (DME) with a long lifetime, and the reduction current of the accumulated complex is measured by linear sweep voltammetry. In order to form the boron(III) complex with Beryllon III, it is necessary to boil the solution for 15 minutes. The electrochemical behavior of the complex is explored. The size of the complex peak, which appears at a position between two peaks of reduction of the ligand, is proportional to the boron concentration. Optimum experimental conditions include 0.05 M HOAc/0.25 M NaOAc as supporting electrolyte, 1 × 10-4 M Beryllon III, solution pH 4.4, and an initial potential of -0.30 V (versus SCE). The linear range of the determination of boron is 4 × 10-5 -1 × 10-5 M. The relative standard error of the method is 0.76% for 3 × 10-6 M boron (III) and 3.4% for 6 × 10-7 M boron (III), respectively.
    Zusätzliches Material: 6 Ill.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1002/elan.1140050511
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  • 5
    Digitale Medien
    Digitale Medien
    On the adsorption voltammetry of the boron-Beryllon III4-[(4-diethylamino-2-hydroxyphenyl)-azo]-5-hydroxy-naphtalen-2, 7-disurphonic acid. system: Part II. Mechanism of the electrochemical reduction of Beryllon III and its complex with B(III) in acetate buffer (1993)
    Weinheim : Wiley-Blackwell
    Electroanalysis 5 (1993), S. 445-453 
    Details
    ISSN: 1040-0397
    Schlagwort(e): Boron ; Beryllon III ; Adsorption voltammetry ; Chemistry ; Polymer and Materials Science
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Chemie und Pharmazie
    Notizen: The adsorptive and voltammetric characteristics of Beryllon III and its complex with B(III) at a mercury electrode have been investigated in acetate buffer. The adsorption phenomena were observed by sampled dc polarography, normal pulse polarography, linear sweep voltammetry, and drop time curve measurement. It was found that (1) the reactant was an azo-group in Beryllon III or its complex with B(III) adsorbed on the surface of the mercury electrode; (2) for reduction of Beryllon III, the product was a hydrazo compound and it was also adsorbed on the surface of the electrode; two electrons and two protons were irreversibly transferred in the overall reaction and the apparent transfer coefficient αn (= 1.8) was measured experimentally; the irreversible electron transfer was followed by a chemical reaction; (3) for reduction of Beryllon III complex with B(III), the product was a hydrazo compound; two electrons and two protons were transferred reversibly in the reaction; the hydrazo compound was desorbed from the surface of the electrode, and the reversible electron transfer was followed by a chemical reaction.
    Zusätzliches Material: 8 Ill.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1002/elan.1140050512
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