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  • Chemistry  (2)
  • 61.70  (1)
  • 78.70
  • General Chemistry
  • 1975-1979  (3)
  • 1977  (3)
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Keywords
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  • 1975-1979  (3)
Year
  • 1
    Electronic Resource
    Electronic Resource
    Positron lifetimes and annihilation lineshape in Cd and au from 4.2 K to the melting points (1977)
    Springer
    Applied physics 12 (1977), S. 59-67 
    Details
    ISSN: 1432-0630
    Keywords: 61.70 ; 81
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Abstract By means of an integrated source-specimen technique the temperature dependence of positron lifetimes and annihilation lineshapes has been measured, on the same specimens of gold and cadmium from 4.2K to the melting points, and also in electronirradiated and quenched gold. The anomalous temperature dependence of positron annihilation at intermediate temperatures (200 to 350 K in Cd, 270 to 750 K in Au) discovered by Lichtenberger, Schulte, and MacKenzie is confirmed. The data are incompatible with the idea that the intermediate temperature dependence is due to thermal expansion. They are well explained by an extension of the trapping model which includes the formation of metastable self-trapped positrons. From lineshape measurements after electron irradiation at 180 K and after quenching it is deduced that the trapping rate of positrons at vacancy-type defects in Au is temperature independent below room temperature.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00900069
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  • 2
    Electronic Resource
    Electronic Resource
    Cyclisierungen mit 1-Nitro-2-anilino-äthylenen (1977)
    New York, NY : Wiley-Blackwell
    Journal für Praktische Chemie/Chemiker-Zeitung 319 (1977), S. 149-158 
    Details
    ISSN: 0021-8383
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Cyclizations with 1-nitro-2-anilino-ethylenesThe reaction of 1-nitro-2-anilino-2-methylthio-ethylenes 1 with oxalyl chloride yields the substituted 4-nitropyrrol-2,3-diones 4, and with chlorocarbonyl-sulfenylchloride the 5-nitro-thiazolones 6. The methylthio group from 6 can be exchanged by amines. From 1-nitro-2,2-bis(anilino)ethylenes 2 - available from 1-nitro-2,2-bis(methylthio)-ethylene and anilines - and the same reagents, the substituted 2-nitromethylene-imidazolidine-4,5-diones 5 and the thiazolo[4,5-d]thiazoledione 9 result. The condensation of 1-nitro-2-anilino-2-hydrazino-ethylene 3 with derivatives of carboxylic acids yields 2-nitromethyl-s-triazole 12, with diacetyl the substituted 3-nitromethylene-as-triazine 13.
    Notes: 1-Nitro-2-anilino-2-methylmercapto-äthylen 1 reagiert mit Oxalylchlorid zu substituierten 4-Nitropyrroldionen-(2,3) 4 und mit Chlorcarbonyl-sulfenylchlorid zu substituierten 5-Nitrothiazolonen-(2) 6, deren Methylmercaptogruppe gegen Amine austauschbar ist. 1-Nitro-2,2-bis(anilino)-äthylene 2 - erhältlich aus 1-Nitro-2,2-bis(methylmercapto)-äthylen und Anilinen  -  liefert mit den gleichen Agenzien substituierte 2-Nitromethylenimidazolidindione-(4,5) 5 und das Thiazolo[4,5-d]thiazoldion 9. 1-Nitro-2-anilino-2-hydrazino-äthylen 3 wird mit Carbonsäurederivaten zu substituierten 2-Nitromethyl-s-triazolen 12, mit Diacetyl zum 3-Nitromethylen-as-triazin derivat 13 kondensiert.
    Additional Material: 1 Tab.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/prac.19773190120
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  • 3
    Electronic Resource
    Electronic Resource
    Das LiPH2 ·1 Monoglym (1977)
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 428 (1977), S. 222-224 
    Details
    ISSN: 0044-2313
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: The LiPH2 ·1 MonoglymeA convenient synthesis of the crystalline LiPH2 · 1 monoglyme is reported by metallating PH3 with n-butyllithium in monoglyme (86% yield relative to n-butyllithium). LiPH2 · 1 monoglyme is stable at room temperature and reasonably soluble in thf, mono-, di-, and triglyme. On pumping (oil pump) it decomposes to “Li2PH” liberating PH3 and monoglyme. “Li2PH” is insoluble in the above mentioned solvents.
    Notes: Es wird die präparative Darstellung von kristallinem LiPH2 · 1 Monoglym (Monoglym = Äthylenglykoldimethyläther) durch Metallierung von PH3 mit n-Butyl-Lithium in Monoglym beschrieben (Ausbeute 86% bezogen auf Lithiumbutyl).LiPH2 · 1 Monoglym ist bei Raumtemperatur beständig und gut löslich in THF, Monoglym, Diglym und Triglym. Beim Abpumpen (Ölpumpe) geht es unter Abgabe von PH3 und Monoglym in “Li2PH” über, das in den genannten Lösungsmitteln nicht löslich ist.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/zaac.19774280127
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