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  • 1
    Electronic Resource
    Electronic Resource
    Hoboken, NJ : Wiley-Blackwell
    AIChE Journal 17 (1971), S. 1499-1501 
    ISSN: 0001-1541
    Keywords: Chemistry ; Chemical Engineering
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Process Engineering, Biotechnology, Nutrition Technology
    Additional Material: 3 Ill.
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  • 2
    Electronic Resource
    Electronic Resource
    New York, NY [u.a.] : Wiley-Blackwell
    Journal of Applied Polymer Science 32 (1986), S. 4109-4118 
    ISSN: 0021-8995
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Stability of a commercially available single-package silicone sealant has been investigated under different water immersion temperatures. The study involved water sorption, weight loss, thermal stability, and strength reduction. It is believed that the deterioration of silicone sealant was due to the combined effects of leaching, water swelling, and hydrolysis. Water uptake of about 2% was crucial for its hydrolytic degradation, especially at higher temperatures.
    Additional Material: 8 Ill.
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  • 3
    ISSN: 0030-4921
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: A spectrometer for recording 14N NMR spectra is described. The 14N NMR linewidth versus pH dependences of several amino acids and related molecules are presented. It appears that the linewidth pH profile of each amino acid is unique. Linewidth minima occur between pH 6 and 8. A discussion on how 14N NMR linewidths of amino acids might give information on weak association is given.
    Additional Material: 4 Ill.
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  • 4
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Journal of High Resolution Chromatography 23 (2000), S. 81-88 
    ISSN: 0935-6304
    Keywords: Monolithic chromatography columns ; capillary electrochromatography (CEC) ; micro high performance liquid chromatography ; sol-gel based columns for chromatography ; fritless capillary chromatography columns ; Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: ---Particle-loaded (3 μm, octadecylsilica) monolithic sol-gel columns have been prepared and selected characteristics measured. Several electrical properties may be calculated from simple current measurements in the column as a whole. Resistivity in the packed segment is approximately three times that in open segments, resulting in a 60% increase in field strength in the packed regions compared to the capillary with no packing. The surprisingly high specific permeability of these sol-gel columns is characteristic of 8-μm particles, which allows their operation in the microLC mode at pressures as low as 69 kPa where their efficiency is about 50,000 plates per meter and in the CEC mode where efficiency is about 106,000 plates per meter at 5 kV. There is a relatively rapid loss of efficiency with increasing linear velocity beyond 0.2 mm/s in microLC mode, which may be due to additional diffusion processes in the inter-particulate voids. A rapid loss of efficiency above 0.5 mm/s is also observed in the CEC mode, for the same reasons. Chromatographic retention behavior in either separation mode is characteristic of conventional octadecylsilica particles, indicating that analytes have significant access to the surface within the pores of the immobilized bonded phase.
    Additional Material: 6 Ill.
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  • 5
    ISSN: 0044-2313
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Es wurde die Substitution von Halogenid durch Hydroxid bei einigen Halogenopentamminkobalt(III)- und -chrom(III)-Kationen in wäßrigem Dioxan bei Alkalikonzentrationen bis zu 0.1 M untersucht. Bei überschüssigem OH- (konstante Ionenstärke) wurden Geschwindigkeitskonstanten nach scheinbar erster Ordnung ermittelt. Es ist eine dem Gleichgewicht vorgelagerte Ionenpaar-Assoziation angezeigt, wobei aber nicht über die Art der Weiterreaktion des Ionenpaares - Direktaustausch oder Protonenabzug - entschieden werden kann. Bei CoIII ist die Ionenpaarbildung Stärker als bei CrIII; sie nimmt mit steigendem Dioxangehalt zu.
    Notes: The replacement, by hydroxide ion, of the coordinated halide from some halogenopentamminecobalt(III) and -Chromium(III) cations in aqueous dioxan has been studied over a range of alkali concentrations up to 0.1 M. With excess of hydroxide ion at constant ionic strength, pseudo first-order rate constants were obtained. The results support a pre-equilibrium association of complex and hydroxide ions in these media, but do not provide distinction as to whether the resulting ion-pair subsequently reacts by direct exchange or by proton removal. The extents of ion association are found to be greater for the cobalt(III) than for the chromium(III) system, increasing with the amount of dioxin in the solvent mixture.
    Additional Material: 2 Ill.
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  • 6
    ISSN: 0044-2313
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Salze einer isomeren Form des Chloro-n-butylamin-, Chloro-iso-butylamin- und Chloro-sec-butylamin-bis(ätylendiamin)-kobalt(III)-Kations wurden dargestellt und spektroskopisch als Komplexe mit cis-Konfiguration charakterisiert. Die Geschwindigkeitskonstanten des spontanen bzw. durch HgII induzierten Ligandenaustausches mit H2O und des hydrolytischen OH-Eintausches wurden bestimmt und die Aktivierungsparameter berechnet. Die Ergebnisse werden mit den an den n-Propylaminkomplexen erhaltenen verglichen, besonders in Hinsicht auf den Einfluß der (α, β, γ) Methylgruppen auf die Reaktivitäten. Die geschwindigkeitsbestimmende Abdissoziation von Cl-oder HgCl+ verläuft entweder über einen quadratisch-pyramidalen oder einen trigonal-bi-pyramidalen Zwischenzustand, je nachdem, ob die Aktivierungsentropie negativ oder positiv ist.
    Notes: Salts of one isomeric form of the chloro-n-butylamine-, chloro-iso-butyl-amine- and chloro-sec-butylamine-bis(ethylenediamine)cobalt(III) cations have been prepared and characterised to have a cis-configuration (IR and VIS spectroscopy). Rate constants for their spontaneous aquation, mercury(II)-induced aquation and base hydrolysis have been determined and the activation parameters calculated. The results are compared with data obtained for the n-propylamine complex with a view to investigate the effects of methyl (α, β, γ) substituents on reactivities.The rate-determining dissociation of the outgoing group (Cl- or HgCl+) takes place via either a square-pyramidal or a trigonal-bipyramidal intermediate, depending on whether the activation entropy is negative or positive.
    Additional Material: 3 Ill.
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  • 7
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 404 (1974), S. 87-96 
    ISSN: 0044-2313
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Oktaedrische Kobalt(III)-Komplexe vom Chloropentammin-Typ. XXXII. Cis-[Coen2(n-CxH2x+1NH2)Cl]2+- Komplexe mit langen Paraffin-KettenSalze von cis-[Coen2(n-CxH2x+1NH2)Cl]2+-Kationen (x = 4 bis 12) wurden dargestellt und ihre VIS- und IR-Spektren aufgenommen. Die Geschwindigkeits-konstanten der Solvolyse wurden bestimmt und die Aktivierungsparameter berechnet. Die spektralen und kinetischen Daten werden kurz diskutiert.
    Notes: Salts of the cis-[Coen2(n-CxH2x+1NH2)Cl]2+ cations where x = 4-12 have been prepared, and their visible and infrared spectra measured. Rate constants for their solvolysis have been determined over a range of temperatures and activation parameters calculated. These spectral and kinetic data are briefly discussed.
    Additional Material: 3 Ill.
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  • 8
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 384 (1971), S. 89-96 
    ISSN: 0044-2313
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Es wurden die Geschwindigkeits- und Aktivierungsparameter der Äthanolyse einiger tetraedrischer Tri-isopropyl-zinnhalogenide bestimmt. Die relative Reaktivität des Halogens, F 〉 Cl 〉 Br 〉 J, wurde bis auf die des Jods experimentell ermittelt und verglichen mit der bei planarquadratischen PtII-Verbindungen sowie bei tetraedrischen Kohlenstoffverbindungen. Die Kinetik der Äthanolyse der Zinnverbindungen wird auf Basis der Elektronegativität des Halogens zu deuten versucht. Es ergibt sich, daß die Geschwindigkeitsabstufung durch gegenläufigen Einfluß von Aktivierungsenthalpie und -entropie bestimmt wird, wobei in völligen Gegensatz zu Substitutionen am tetraedrischen Kohlenstoff die Enthalpie dominiert.
    Notes: The rates and activation parameters for the solvolysis of some tetrahedral triisopropyltin halides by ethanol have been determined and the relative mobilities of halogens compared with the corresponding observations in square-planar platinum(II) compounds on the one hand, and in tetrahedral carbon compounds on the other. The reactions of these tin compounds are expected to follow the pattern F 〉 Cl 〉 Br 〉 I, and except for the iodide, this is now confirmed experimentally. An attempt is made to interpret the kinetic results in terms of the electronegativity of the halogens, which facilitates bond formation with the incoming nucleophile. For these reactions, the rate order depends on opposing effects of activation enthalpy and entropy, with the former predominating, and in this way they are in complete contrast to tetrahedral carbon substitutions where the entropy factor controls the rate.
    Additional Material: 5 Ill.
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  • 9
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 387 (1972), S. 120-125 
    ISSN: 0044-2313
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Brom-[2H5]diäthylentriamin-platin(II)-bromid wurde dargestellt und die Kinetik seiner Reaktion mit 3-Cyanopyridin in D2O-Lösung untersucht. Die Ergebnisse werden mit früheren über die entsprechende Reaktion der nicht-deuterierten Verbindung in H2O-Lösung verglichen; der beobachtete Isotopie-Effekt und der Reaktionsmechanismus werden diskutiert.
    Notes: Bromo-[2H5]diethylenetriamineplatinum(II) bromide has been prepared and characterised, and the kinetics of its reaction with 3-cyanopyridine in deuterium oxide solution have been investigated. The results are compared with those previously reported for the corresponding reaction of the protium complex in protium oxide solution, and the deuterium isotope effect observed is discussed in terms of an associative mechanism.
    Additional Material: 3 Ill.
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  • 10
    Electronic Resource
    Electronic Resource
    Hoboken, NJ : Wiley-Blackwell
    Journal of Biomedical Materials Research 7 (1973), S. 485-488 
    ISSN: 0021-9304
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Medicine , Technology
    Additional Material: 1 Ill.
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