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  • 1990-1994  (3)
  • 1992  (3)
  • Chemistry  (3)
  • Inorganic Chemistry
  • Occupational Health and Environmental Toxicology
  • 1
    Electronic Resource
    Electronic Resource
    Determination of the Enthalpies of Formation of DyI2 and DyI3 and estimation of the Dy3+/Dy2+ standard aqueous electrode potentialDedicated to Professor Rudolf Hoppe on his 70th Birthday (1992)
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 616 (1992), S. 162-168 
    Details
    ISSN: 0044-2313
    Keywords: Dysprosiumdiiodide ; dysprosium triiodide ; enthalpy ; electrode potential ; Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Bestimmung der Bildungsenthalpien von DyI2 und DyI3 sowie Abschätzung des Dy3+/Dy2+-Standardelektrodenpotentials in wäßrigem MediumDyI2 and DyI3 wurden nach Literaturmethoden hergestellt. Ihre Lösungsenthalpien wurden bestimmt und die Bildungsenthalpien zu ΔfH°(DyI3, s, 298 K) = -(394 ± 16) kJ · mol-1 und ΔfH°(DyI2, s, 298 K) = -(616 ± 10) kJ· mol-1 berechnet. Entsprechenden Literaturangaben sowie geschätzten Lösungsenthalpien und Standardentropien wurde E°(Dy3+/Dy2+, aq.) zu -(2.6 ± 0.2) V berechnet. Ein Vergleich der Enthalpien für die Reduktion von DyI3 zu DyI2 bzw. DyI zu DyI2 wird vorgenommen.
    Notes: DyI2 and Dy3I were synthesized by literature techniques. Their enthalpies of solution were determined and their enthalpies of formation calculated to be ΔfH°(DyI2, s, 298 K) = -(394 ± 16) kJ· mol-1 and ΔfH°(DyI3, s, 298 K) = -(616 ± 10) kJ· mol-1. With appropriate literature and estimated enthalpies of solution and standard entropies, the E°(Dy3+/Dy2+, aq) was calculated to be -(2.6 ± 0.2) V. A comparison is made of the enthalpies of reduction of DyI3 to DyI2 and of DyCl3 to DyCl2.
    Additional Material: 2 Tab.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/zaac.19926161025
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Compounds with bridgehead nitrogen 68For Part 67, see Ref. 1. - NMR spectra and stereochemistry of perhydropyrido [1,2-c] [1,3]oxazines (1992)
    Chichester : Wiley-Blackwell
    Organic Magnetic Resonance 30 (1992), S. 129-132 
    Details
    ISSN: 0749-1581
    Keywords: Perhydropyrido[1,2-c][1,3]oxazines ; 1H and 13C NMR ; Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Low-temperature 13C NMR spectroscopy shows perhydropyrido [1,2-c] [1,3]oxazine to adopt a conformational equilibrium in CD2Cl2-CFCl3 solution containing 98% trans fused conformer in equilibrium with 2% O-outside-cis fused conformer at 203 K. A similar equilibrium position is adopted by the trans-(H-4,H-4a)-4-methylperhydropyrido[1,2-c][1,3]oxazine, whereas the C-4 epimer adopts exclusively the trans fused conformation.
    Additional Material: 3 Tab.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/mrc.1260300207
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    Use of organotin stabilizers - risk assessment analysis (1992)
    Brookfield, Conn. : Wiley-Blackwell
    Journal of Vinyl and Additive Technology 14 (1992), S. 131-134 
    Details
    ISSN: 0193-7197
    Keywords: Chemistry ; Chemical Engineering
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Process Engineering, Biotechnology, Nutrition Technology
    Notes: Organotin compounds have long been known in the PVC industry for their excellent performance properties in almost every application. Over the past several years, a wide variety of health and environmental studies have been conducted which demonstrate the safe use of these performance chemicals as PVC heat stabilizers. This paper introduces the “risk equation” and then applies this equation to the foreseeable exposure risks involved with the use of organotin stabilizers during PVC processing. Further, migration of organotin species from PVC end-use articles is discussed with comparison to established long-term no-effect levels for these chemicals. The environmental fate of organotin compounds and their effects on some species of microorganisms is also addressed. The risk equation is used to fully evaluate all potential hazards to provide a fully informed risk assessment for the use of organotin stabilizers in PVC.
    Additional Material: 4 Tab.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/vnl.730140304
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    Paper (German National Licenses)
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