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  • Chemistry  (10)
  • Polymer and Materials Science  (7)
  • 1995-1999  (4)
  • 1990-1994  (5)
  • 1985-1989  (1)
Collection
Publisher
Years
Year
  • 1
    Electronic Resource
    Electronic Resource
    New York, NY : Wiley-Blackwell
    Helvetica Chimica Acta 71 (1988), S. 1156-1176 
    ISSN: 0018-019X
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Based on the substrate specificity for 5-lipoxygenase and the known stereochemical course of the reaction, a hypothetical model of the enzyme active site was developed and used to design 2 types of selective inhibitors of 5-lipoxygenase. Both inhibitor types used aromatic rings in place of (Z)-olefins of the substrate and were designed to mimic the nonpolar end of arachidonic acid. One inhibitor type used a carboxylic-acid interaction with the O-binding centre of the enzyme in analogy with known cyclooxygenase inhibitors, whereas a second type employed a hydroxylamine function to interact with a presumed tyrosine or cysteinyl radical predicted to be in the enzyme active site. Selective 5-lipoxygenase inhibitors were 7-(hexyloxy) naphthalene-2-acetic acid (1) and N-methyl;-N(7-propoxynaphthalene-2-ethyl)hydroxylamine (2). Structure-activity relationships for both types of inhibitors are discussed.
    Additional Material: 3 Ill.
    Type of Medium: Electronic Resource
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  • 2
    ISSN: 1040-0397
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: The on-line high-performance liquid chromatography-electrochemistry-thermospray mass spectrometry (LCEC-LC/MS) for separation and identification of the phenolic isoflavones genistein, formononetin, and Biochanin A is described. The isoflavones are separated on a C-18 reversed phase column with methanol: 0.1 M ammonium acetate pH (70:30 v/v) as eluent, which is compatible for both LCEC and LC/MS detection. Low ng detection is achieved with a conventional glassy carbon thin-layer electrochemical cell at 1.3 V vs. Ag/AgCl. Selected ion monitoring (SIM) mode LCMS results in detection levels at the 20-50 ng range, and the compounds are positively identified. In the on-line detection, the electrochemical cell is connected to the thermospray and the column effluent flows from the working electrode into the heated thermospray capillary tube. The results show that on-line coupling between a thin-layer LCEC and a thermospray-LC/MS can be used to characterize analytical systems.
    Additional Material: 5 Ill.
    Type of Medium: Electronic Resource
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  • 3
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Electroanalysis 9 (1997), S. 231-234 
    ISSN: 1040-0397
    Keywords: Diffusion coefficients ; Gallium ; Mass transport ; Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: The diffusion coefficient values of GaIII in potassium nitrate and potassium chloride supporting electrolytes have been obtained polarographically. The half-wave potential, E1/2, and E3/4-E1/4 values have also been determined. The E3/4 - E1/4 values confirm the irreversibility of GaIII reduction in KNO3 and KCl electrolytes.
    Additional Material: 3 Ill.
    Type of Medium: Electronic Resource
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  • 4
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Electroanalysis 9 (1997), S. 796-799 
    ISSN: 1040-0397
    Keywords: Isoflavones ; Cyclic voltammetry ; High-performance liquid chromatography ; Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: This study provides electrochemical and LCEC determination for three of the most abundant and most important isoflavones, Biochanin A, formononetin, and genistein. Cyclic voltammetry and pH-potential diagrams show that the isoflavones undergo pH-dependent irreversible oxidations. The LCEC determination of the isoflavones has been optimized for mobile phase composition and detection potential. Sub-nanogram detection limits have been achieved.
    Additional Material: 5 Ill.
    Type of Medium: Electronic Resource
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  • 5
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Electroanalysis 8 (1996), S. 307-313 
    ISSN: 1040-0397
    Keywords: Diffusion coefficients ; Diffusion ; Metallic ions ; Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Many techniques are available for the determination of diffusion coefficients of ions in aqueous solutions. A review of classical and modern techniques is presented. Non-electrochemical methods are discussed briefly. Electrochemical methods reviewed include chronoamperometry, chronopotentiometry, polarography, and hydrodnamics. Selected values of the diffusion coefficients determined by these electrochemical methods of the metallic ions AgI, BiIII, CdII, CuII InIII, PbII, TlI, and ZnII are presented.
    Additional Material: 6 Tab.
    Type of Medium: Electronic Resource
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  • 6
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Electroanalysis 9 (1997), S. 1273-1277 
    ISSN: 1040-0397
    Keywords: Cyclic voltammetry ; Porphyrins ; Silicon ; Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Cyclic voltammetry was used to characterize the oxidation-reduction behavior of a series of novel hexacoordinate silicon(IV) porphyrin complexes. Each (Por)SiX2 [Por = the dianions of the porphyrins: tetrakis(p-tolyl)porphyrin (TTP), tetraphenylporphyrin (TPP), tetrakis(p-trifluoromethylphenyl)porphyrin (TTFP), octaethylporphyrin (OEP), × = F, Cl, O3SCF3] complex undergoes one to two oxidations and one to two reductions, all occurring at the porphyrin ring. No silicon(IV) reduction is observed for any of the porphyrin complexes. The effects of solvent, supporting electrolyte, substituents on the porphyrin ring, axial ligands, certral metal, and ruffling of the porphyrin ring are described.
    Additional Material: 3 Ill.
    Type of Medium: Electronic Resource
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  • 7
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Electroanalysis 3 (1991), S. 145-155 
    ISSN: 1040-0397
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: A review of the development and application of extended X-ray absorption fine structure (EXAFS) spectroscopy for in situ structural characterization of chemical processes at he electrode surface is presented. The designs of the in situ electrochemical cells developed to date are shown. Applications are presented from the areas of metal passivation, spectroelectrochemistry, modified electrodes, underpotential deposition, and adsorption.
    Additional Material: 15 Ill.
    Type of Medium: Electronic Resource
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  • 8
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Electroanalysis 4 (1992), S. 487-493 
    ISSN: 1040-0397
    Keywords: Spectroelectrochemistry ; reticulated vitreous carbon ; detector ; Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: A spectroelectrochemical detector for flow injection and liquid chromatography is described. The detector design has dimensions of a standard 1 cm sample cuvette with a replaceable reticulated vitreous carbon working electrode. No special cell holder or modifications to the spectrophotometer are required to use the detector. Chronocoulometry is used to indicate a trend from thin-layer behavior toward semi-infinite diffusion behavior as the electrode pore size increases. Ferro-/ferricyanide solutions were used to evaluate the flow injection characteristics of the detector. A sampling rate of 180 injections per hour was used. Linear calibration curves in the micromolar range were achieved with a reproducibility of 2-7%. A mixture of phenol, chlorophenols, and nitrophenols was used to investigated the simultaneous electrochemical and optical response for liquid chromatography.
    Additional Material: 8 Ill.
    Type of Medium: Electronic Resource
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  • 9
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 604 (1991), S. 63-67 
    ISSN: 0044-2313
    Keywords: 2-Silapropane-2, 2-dithiolates ; 2-silapropane-2, 2-dithiol ; preparation ; i. r. spectra ; Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Demonstration of the Existence of 2-Silapropane-2, 2-dithiolatesThe unstable title compounds M2[S2Si(CH3)2] with M = Li, Na, K have been prepared by reaction of Cl2Si(CH3)2 with the corresponding sulfide in tetrahydrofurane. The existence of the dithiolates has been demonstrated by means of spectroscopic and chemical methods. They react with alkyl halides forming 2, 2-bis(alkylthio)-2-silapropanes. With carbon disulfide no reaction occurs.The reaction between Cl2Si(CH3)2 and H2S in the presence of pyridine produces at -78°C also unstable 2-silapropane-2, 2-dithiol (HS)2Si(CH3)2.
    Notes: Die instabilen Titelverbindungen M2[S2Si(CH3)2] mit M = Li, Na, K wurden durch Umsetzung von Cl2Si(CH3)2 mit dem entsprechenden Sulfid in Tetrahydrofuran hergestellt. Die Existenz der Dithiolate wurde mit Hilfe spektroskopischer und chemischer Methoden bewiesen. Sie reagieren mit Alkylhalogeniden zu 2, 2-Bis(alkylthio)-2-silapropanen. Mit Kohlenstoffdisulfid findet keine Umsetzung statt.Die Reaktion zwischen Cl2Si(CH3)2 und H2S in Gegenwart von Pyridin führt bei -78°C zu ebenfalls instabilem 2-Silapropan-2, 2-dithiol (HS)2Si(CH3)2.
    Additional Material: 2 Tab.
    Type of Medium: Electronic Resource
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  • 10
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 606 (1991), S. 209-211 
    ISSN: 0044-2313
    Keywords: 2-Silapropane-2,2-bis(dithiocarbonic acid methyl ester) ; preparation ; Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: On Chalcogenolates. 200. Methyl Ester of 2-Silapropane-2,2-bis(dithiocarbonic acid)The hitherto not known title compound (H3C)2Si(—CS—SCH3)2 has been prepared in one-pot synthesis by reaction of dimethyl dichlorosilane with magnesium followed by CS2 insertion and alkylation with methyl iodide. The compound has been characterized by means of diverse methods.
    Notes: Die bisher nicht bekannte Titelverbindung (H3C)2Si(—CS—SCH3)2 wurde im Eintopfverfahren durch Umsetzung von Dimethyldichlorsilan mit Magnesium, anschließender CS2-Insertion und Alkylierung mit Methyliodid hergestellt und mit verschiedenen Methoden charakterisiert.
    Additional Material: 1 Tab.
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