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  • 2005-2009
  • 1990-1994  (4)
  • 1990  (4)
  • Chemistry  (4)
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  • 2005-2009
  • 1990-1994  (4)
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  • 1
    Electronic Resource
    Electronic Resource
    Isothermal volume relaxation in aged polycarbonate measured by positron annihilation lifetime spectroscopy (1990)
    Stamford, Conn. [u.a.] : Wiley-Blackwell
    Polymer Engineering and Science 30 (1990), S. 762-768 
    Details
    ISSN: 0032-3888
    Keywords: Chemistry ; Chemical Engineering
    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: The positron annihilation lifetime spectroscopy (PALS) technique is used to measure volume relaxation in physically aged glassy polycarbonate. The relaxation times and activation energy calculated for the isothermal relaxations in the aged polycarbonate are greater than those parameters calculated for unaged polycarbonate. The activation energy of 8.2 kcal/mol in the aged polycarbonate is used to identify the phenyl group motion or the cooperative carbonate-phenyl interaction as the molecular features responsible for the thermally induced open volume relaxations. It is postulated that the open volume relaxation kinetics as measured by PALS can be used as a nondestructive indication of property differences between aged and unaged polycarbonate.
    Additional Material: 6 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/pen.760301303
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  • 2
    Electronic Resource
    Electronic Resource
    Polysulfonylamine. XX. (1/1)-Molekülkomplexe von Di(organosulfonyl)aminen mit Triphenylphosphinoxid. Röntgenstrukturanalyse von Dimesylamin-Triphenylphosphinoxid (1/1) (1990)
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 589 (1990), S. 167-174 
    Details
    ISSN: 0044-2313
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Polysulfonyl Amines. XX. (1/1) Molecular Adducts of Di(organosulfonyl) Amines with Triphenylphosphine Oxide. X-Ray Structure Determination of Dimesylamine-Triphenylphosphine Oxide (1/1)From equimolar solutions of the respective components in organic solvents, crystalline addition compounds of composition (RSO2)2NH · OP(C6H5)3 are obtained, where R = CH3, C6H5, 4-X—C6H4 (X = CH3, F, Cl, Br, NO2) or 3-NO2—C6H4. (CH3SO2)2NH · OP(C6H5)3 crystallizes in the monoclinic space group P21/n. A short NH⃛O hydrogen bond [N⃛O 266.1(5) pm] connects the dimesylamine molecule with the triphenylphosphine oxide molecule.
    Notes: Aus äquimolaren Lösungen der jeweiligen Komponenten in organischen Lösemitteln werden kristalline Addukte der Zusammensetzung (RSO2)2NH · OP(C6H5)3 mit R = CH3, C6H5, 4-X—C6H4 (X = CH3, F, Cl, Br, NO2) sowie 3-NO2—C6H4 erhalten. (CH3SO2)2NH · OP(C6H5)3 kristallisiert in der monoklinen Raumgruppe P21/n. Eine kurze Wasserstoffbrücke des Typs NH⃛O [N⃛O 266,1(5) pm] verknüpft das Dimesylamin- mit dem Triphenylphosphinoxid-Molekül.
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/zaac.19905890118
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  • 3
    Electronic Resource
    Electronic Resource
    Reaktionsverhalten von Phosphorpentahalogeniden mit Übergangsmetallcarbonyl-Verbindungen. IV [1 - 3]. Das Reaktionsverhalten von Phosphorpentahalogeniden gegenüber [CpM(CO)3]2 (M = Cr, Mo, W) Die Kristallstruktur von CpCrCl2CH3CN (1990)
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 591 (1990), S. 221-229 
    Details
    ISSN: 0044-2313
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Reactivity of Phosphorus Pentahalides with Transition Metal Carbonyls. IV. Reactivity of Phosphorus Pentahalides with [CpM(CO)3]2 (M = Cr, Mo, W). Crystal Structure of CpCrCl2CH3CNPX5 (X = Cl, Br) reacts with cyclopentadienyl complexes of the type [CpM(CO)3]2 (M = Cr, Mo, W) at room temperature in high yields to give complexes CpCrX2CH3CN and CpMX4CH3CN (X = Cl, Br; M = Mo, W), respectively. The complexes were characterized by IR and ESR spectroscopy and magnetic measurements. CpCrCl2CH3CN crystallizes in the space group P21/c as a monomer with distorted tetrahedral geometry at chromium. The Cp ring is disordered.
    Notes: Die Reaktion von PX5 mit Cyclopentadienylderivaten des Typs [CpM(CO)3]2 (M = Cr, Mo, W; Cp = η5-C5H5) führt bei Raumtemperatur in hohen Ausbeuten zu den Halogeno-Komplexen CpCrX2CH3CN bzw. CpMX4CH3CN (X = Cl, Br; M = Mo, W). Die erhaltenen Derivate werden anhand der IR- und ESR-Spektroskopie, sowie der Messung magnetischer Daten charakterisiert. CpCrCl2CH3CN kristallisiert in der Raumgruppe P21/c als Monomer mit verzerrter tetraedrischer Geometrie am Chrom. Der Cp-Ring ist ungeordnet.
    Additional Material: 1 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/zaac.19905910127
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  • 4
    Electronic Resource
    Electronic Resource
    Picosecond inverse Raman spectroscopy and sum-frequency generation in potassium dihydrogenphosphate crystals (1990)
    Chichester [u.a.] : Wiley-Blackwell
    Journal of Raman Spectroscopy 21 (1990), S. 827-833 
    Details
    ISSN: 0377-0486
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: Experiments in Raman amplification spectroscopy monitor the intensity change of one laser beam under the perturbing influence of another in a Raman-active medium. Accompanying such changes one frequently observes the presence of other, non-Raman, processes arising from non-linear susceptibility terms χ(2) and χ(3), in addition to linear changes caused by species absorption and fluorescence. One such non-Raman process observed during a Raman study of potassium dihydrogenphosphate (KDP) is sum-frequency generation. Although the subject of second-harmonic/sum-and difference-frequency generation is well understood, the indirect quantitative measurement of such processes by means of the measured power loss of one or other of the incident beams has remained an area hitherto unexplored. This paper redresses this omission by comparing experimentally the directly measured sum-frequency power generated in a KDP frequency-doubling crystal with the power loss of the probe beam transmitted through the crystal.The results, viewed in an overall perspective, are very promising and the experiments demonstrate the value of the pump-probe technique as a means of investigating non-linear optical mixing processes, with the added advantage of an experimental set-up which may be adapted, with the minimum of adjustments, to accommodate simultaneous investigations of several other spectroscopic processes occurring within the same system. These studies provide an interesting and important route for the further understanding and utilization of the non-linear processes occurring in optical crystals such as KDP.
    Additional Material: 1 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/jrs.1250211211
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