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  • 1
    Electronic Resource
    Electronic Resource
    Photooxidation of polystyrene by O2 and N2O (1992)
    Bognor Regis [u.a.] : Wiley-Blackwell
    Journal of Polymer Science Part A: Polymer Chemistry 30 (1992), S. 2677-2681 
    Details
    ISSN: 0887-624X
    Keywords: polystyrene ; photooxidation ; oxygen ; nitrous oxide ; ultraviolet ; Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Strips of polystyrene held in a flowing O2 or N2O atmosphere have been exposed to 240-600 nm radiation. The extent of photooxidation has been followed by x-ray photoelectron spectroscopy (XPS). Although N2O is a more reactive gas than O2, it produces a less oxidized polymer surface. This surprising observation can be correlated to the photochemistry occurring at the gas/polystyrene interface. © 1992 John Wiley & Sons, Inc.
    Additional Material: 3 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/pola.1992.080301302
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  • 2
    Electronic Resource
    Electronic Resource
    A study of photosensitive insecticidal volatile compounds in marigold (Tagetes minuta) (1993)
    Weinheim : Wiley-Blackwell
    Journal of High Resolution Chromatography 16 (1993), S. 53-55 
    Details
    ISSN: 0935-6304
    Keywords: Gas chromatography ; Plant extract ; Photochemical degradation ; Insecticides ; Volatile compounds ; Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/jhrc.1240160111
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  • 3
    Electronic Resource
    Electronic Resource
    Synthesis and characterization of (Me3Si)2AsCH2RCH2As(SiMe3)2 (R = CH2, SiME2) and (1990)
    New York, NY [u.a.] : Wiley-Blackwell
    Heteroatom Chemistry 1 (1990), S. 475-478 
    Details
    ISSN: 1042-7163
    Keywords: Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: The synthesis and characterization of (Me3Si)2AsCH2RCH2As(SiMe3)2 [R = CH2 (1), SiMe2 (2)] is described. Compound 1 reacts with four equivalents of Ph2GaCl to produce (3), whose structure was deduced by use of 1H and 13C{1H} NMR spectroscopy.
    Additional Material: 1 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/hc.520010608
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  • 4
    Electronic Resource
    Electronic Resource
    Reactions of GaX3 (x = br, i) with AS(SiMe3)3; crystal structures of I3Ga · as(SiMe3)3 and [I2GaAS(sime3)2]2 (1992)
    New York, NY [u.a.] : Wiley-Blackwell
    Advanced Materials for Optics and Electronics 1 (1992), S. 29-36 
    Details
    ISSN: 1057-9257
    Keywords: Gallium-arsenic compounds ; Single-source ; gallium ; arsenide ; precursors ; Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Electrical Engineering, Measurement and Control Technology , Physics
    Notes: Reactions of GaX3 (X = Br, I) with As(SiMe3)3 in 1:1 and 2:1 mole ratios were investigated. For the latter reactant stoichiometry, substances having the empirical formulae AsBr3Ga2 (1) and Asl3Ga2 (2), the analogues of the previously reported single-source GaAs precursor (AsCl3Ga2)n, were isolated as yellow isolated as yellow insoluble powders. Low-temperature reactions in a 1:1 mole ratio resulted in the isolation of the adducts Br3Ga.As(SiMe3)3 (3) and I3Ga.As(SiMe3)3 (4). On the other hand, at room temperature the GaBr3 reaction resulted in a complex mixture from which no characterizable compounds were isolated, whereas the Gal3 reaction afforded the crystalline compound [I2GaAs(SiMe3)2]2 (5). The structures of 4 and 5 were elucidated by complete single-crystal X-ray analysis (crystal data: 4, monoclinic, space group P21/c, a = 16.497(2) Å, b = 9.629(1) Å, c = 16.658(2) Å, β = 113.21(1)°, V = 2432(1) Å3, Z = 4; 5, orthorhombic, space group Pbca, a = 14.279(2) Å, b = 17.509(2) Å, c = 13.818(2), Å, V = 3455(1) Å3, Z = 4).
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/amo.860010106
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  • 5
    Electronic Resource
    Electronic Resource
    Enhanced mass resolution in a quadrupole ion trap (1993)
    New York, NY : Wiley-Blackwell
    Rapid Communications in Mass Spectrometry 7 (1993), S. 43-45 
    Details
    ISSN: 0951-4198
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Physics
    Notes: The versatility of the quadrupole ion trap as a mass spectrometer in which the mass resolution may be varied over a wide range has been demonstrated. Mass resolution of 0.8 × 107 and 1.2 × 107 have been obtained for ions of m/z 414 and m/z 614, respectively, well in excess of the normal value of 3m, where m is the mass of ion. At the highest mass resolution, peak-widths at half-maximum are but 52 × 10-6 u. While it has been shown previously that enhanced mass reslution in the quadrupole ion trap can be achieved by reduction of the mass scanning rate, the range of mass resolutions reported here were achieved by reducing the mass scanning rate, in stages, by an overall factor of ca 5.5 × 104.
    Additional Material: 4 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/rcm.1290070111
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  • 6
    Electronic Resource
    Electronic Resource
    Kinetics of the solvolysis of chloropentacyanocobaltate (III) ions in mixtures of ethane-1,2-diol or ethanonitrile with water (1992)
    New York, NY : Wiley-Blackwell
    International Journal of Chemical Kinetics 24 (1992), S. 1043-1053 
    Details
    ISSN: 0538-8066
    Keywords: Chemistry ; Physical Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: The kinetics of the solvolysis of [Co(CN)5Cl]3- ions have been investigated in mixtures formed by the addition of ethane-1,2-diol or ethanonitrile to water where the physical properties indicate little enhancement of structure in water-rich conditions. The effect on the kinetics of this solvolysis of this lack of structural change in the solvent shows in the linearity of the variation of log (rate constant) with the reciprocal of the dielectric constant for the addition of ethane-1,2-diol to water and the absence of any prominent extrema in the enthalpy or entropy of activation using either co-solvent. However, the effect of changes in solvation on the solvolysis with these two co-solvents appears to operate in a similar manner to the effects found when the hydrophobic co-solvent propan-2-ol is added to water. The application of a free energy cycle to the process of the initial state going to the transition state for this dissociative process suggests that, with both co-solvents, [Co(CN)5]2- in the transition state is more stable than [Co(CN)5Cl]3- in the initial state. © John Wiley & Sons, Inc.
    Additional Material: 5 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/kin.550241203
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  • 7
    Electronic Resource
    Electronic Resource
    The determination of cocaine and related substances by micellar electrokinetic capillary chromatography (1994)
    Weinheim : Wiley-Blackwell
    Electrophoresis 15 (1994), S. 103-108 
    Details
    ISSN: 0173-0835
    Keywords: Chemistry ; Biochemistry and Biotechnology
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Biology , Chemistry and Pharmacology
    Notes: A quantitative method for the determination of cocaine and related substances by micellar electrokinetic capillary chromatography (MECC) is described. Quantitative results obtained for both monitor materials and a number of actual drug seizures by this new capillary electrophoretic method are comparable to a gas chromatography (GC) run in parallel, both in the values and coefficient of variation achieved. The advantages of this new method include minimal use of solvents, the ability to readily automate the procedure and the ability to quantitate illicit heroin seizures under the same conditions with the exception of detector wavelength alteration. The method has proved rugged and reliable for both heroin and cocaine in a number of inter-laboratory proficiency studies.
    Additional Material: 6 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/elps.1150150116
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  • 8
    Electronic Resource
    Electronic Resource
    Kinetics of the solvolysis of [Co(3Rpy)4Cl2]+ ions (R = Me or Et) in water and in water + methanol mixtures (1990)
    New York, NY : Wiley-Blackwell
    International Journal of Chemical Kinetics 22 (1990), S. 891-903 
    Details
    ISSN: 0538-8066
    Keywords: Chemistry ; Physical Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Rates of solvolysis of ions [Co(3Rpy)4Cl2]+ with R = Me and Et have been measured over a range of temperatures for a series of water-rich water + methanol mixtures to investigate the effect of changes in solvent structure on the solvolysis of complexes presenting a largely hydrophobic surface to the solvent. The variation of the enthalpies and entropies of activation with solvent composition has been determined. A free energy cycle relating the free energy of activation in water to that in water + methanol is applied using free energies of transfer of individual ionic species from water into water + methanol. Data for the free energy of transfer of chloride ions ΔGt∘(Cl-) from both the spectrophotometric solvent sorting method and the TATB method for separating ΔGt∘(salt) into ΔGt∘(i) for individual ions are used: irrespective of the source of ΔGt∘(Cl-), in general, -ΔGt∘(Co(Rpy)4Cl2+) 〉 -ΔGt∘(Co(Rpy)4Cl2+), where Rpy = py, 4Mepy, 4Etpy, 3Etpy, and 3Mepy, showing that changes in solvent structure in water-rich water + methanol mixtures generally stabilize the cation in the transition state more than the cation in the initial state for this type of complex ion. A similar result is found when the free energy cycle is applied to the solvolysis of the dichloro (2,2′,2″-triaminotriethylamine)cobalt(III) ion. The introduction of a Me or Et group on the pyridine ring in [Co(Rpy)4Cl2]+ has little influence on the difference {ΔGt∘(Co(Rpy)4Cl2+)-ΔGt∘(Co(Rpy)4Cl2+)} in water + methanol with the mol fraction of methanol 〈 0.20.
    Additional Material: 6 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/kin.550220902
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  • 9
    Electronic Resource
    Electronic Resource
    Kinetics of the solvolysis of [Co(3Rpy)4Cl2]+ (R = Me or Et) in water + propan-2-ol mixtures (1991)
    New York, NY : Wiley-Blackwell
    International Journal of Chemical Kinetics 23 (1991), S. 161-172 
    Details
    ISSN: 0538-8066
    Keywords: Chemistry ; Physical Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Rates of solvolysis of complex ions [Co(3Rpy)4Cl2]+ with R = Me and Et have been determined in mixtures of water with the hydrophobic co-solvent propan-;2-ol for a range of temperatures. The variations of the enthalpies and entropies of activation with the solvent composition have been correlated with the physical properties of the solvent and it has been shown that the linear plot found for ΔH* against ΔS* in water + propan-2-ol is coincident with that found for water + methanol mixtures. A free energy cycle has been applied to the dissociative-type process of initial state (Cn+) going to the transition state (M(n+1)+…‥ Cl-) using values for the free energy of transfer of the chloride ion from water into the mixture, ΔGt∘(Cl-), derived from the solvent sorting technique or from the TATB/TPTB method. Irrespective of the source of ΔGt∘(Cl-), it is found that ΔGt∘(Co(3Rpy)4Cl2+*) ca. ΔGt∘(Co(3Rpy)4Cl2+) (where * indicates a species in the transition state) for mol fractions of propan-2-ol x2 ≳ 0.04-0.05 with ΔGt∘(Co(3Rpy)4Cl2+*) becoming increasingly more negative than ΔGt∘(Co(3Rpy)4Cl2+) as x2 increases above 0.05. These variations are compared with those for the solvolysis of the same ions in water + methanol mixtures and of a range of other ions in water + propan-2-ol mixtures. It is concluded that, using values for ΔGt∘(Cl-) from either source, the stabilizing influence of changes in solvent structure is greater on the cation in the transition state than on the cation in the initial state for the solvolyses of complexes [Co(Rpy)4Cl2+] and [Coen2LCl]n+.
    Additional Material: 6 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/kin.550230207
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  • 10
    Electronic Resource
    Electronic Resource
    Kinetics of the solvolysis of [Co(3Rpy)4Cl2]+ ions (R = Me or Et) in Water + t-butyl alcohol mixtures (1992)
    New York, NY : Wiley-Blackwell
    International Journal of Chemical Kinetics 24 (1992), S. 563-577 
    Details
    ISSN: 0538-8066
    Keywords: Chemistry ; Physical Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Rates of solvolysis of complex ions [Co(3Rpy)4Cl2]+ with R = Me and Et have been determined in mixtures of water with t-butyl alcohol over a range of temperatures. Extrema found in the enthalpy ΔH* and entropy ΔS* of activation are correlated with the physical properties of the solvent mixtures which are influenced by changes in the solvent structure and these extrema are compared with those found for the solvolysis of related complexes in water + alcohol mixtures. Isokinetic plots over wide ranges of ΔH* and ΔS* are compared for the solvolysis of CoIII complexed to a variety of ligands. The application of a free energy cycle shows that the emergent cobalt (III) cation in the transition state becomes increasingly stabilized in water-rich mixtures relative to the cobalt (III) cation in the initial state as the mol fraction of t-butyl alcohol increases.
    Additional Material: 7 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/kin.550240606
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