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  • Chemistry  (5)
  • 73  (1)
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  • 1
    Electronic Resource
    Electronic Resource
    Springer
    Applied physics 16 (1978), S. 381-390 
    ISSN: 1432-0630
    Keywords: 73 ; 72.20
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Abstract Indium-tin-oxide films (ITO films) sputtered in Ar-atmosphere with and without addition of oxygen reveal an irreversible increase in conductivity during annealing in vacuum. This annealing process increases drastically the density of free electrons, while the Hall mobility changes only slightly. Below the annealing temperature the temperature dependence of the conductivity is reversible. In films with low density of free electrons, which behave like non-degenerated semiconductors, two activation energies for the mobility could be found. The irreversible changes, observed during annealing in the vacuum, are explained by diffusion of oxygen from the interior of the film to the surface, followed by desorption of the oxygen from the surface into the vacuum. The excess oxygen in the non-stoichiometric films plays the role of electron traps. The irreversible effects during annealing in the vacuum are partly reversible in the long run. If the annealed films are exposed to oxygen or air their conductivity decreases because of diffusion of oxygen from the surface into the film.
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 101 (1968), S. 51-57 
    ISSN: 0009-2940
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Aminalester dismutieren in Amidacetale und Tris-dialkylamino-methane, umgekehrt kommutieren letztere zu Aminalestern. Die Reaktionen laufen über Dissoziationsgleichgewichte, die durch Leitfähigkeitsmessungen bewiesen wurden.
    Additional Material: 4 Tab.
    Type of Medium: Electronic Resource
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  • 3
    ISSN: 0009-2940
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Durch Umsetzung von N.N-Dialkylformamid-Dialkylsulfat-Addukten mit Alkoholaten in Alkohol oder durch Umacetalisierung einfacher oder gemischter N.N-Dialkylformamid-dialkylacetale mit Alkoholen erhält man N.N-Dialkylformamid-dialkylacetale (Amidacetale); die bei der Umsetzung der N.N-Dialkylformamid-Dialkylsulfat-Addukte mit Dimethylamin erhaltenen N.N.N′.N′.-Tetramethyl-formamidinium-methylsulfate lassen sich mit alkoholfreien Alkoholaten zu den Bis-dimethylamino-alkoxy-methanen (Aminalester) umsetzen.
    Additional Material: 3 Tab.
    Type of Medium: Electronic Resource
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  • 4
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 106 (1973), S. 3725-3731 
    ISSN: 0009-2940
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Orthoamides, XXIV. Synthesis and Reactions of Amide Thioacetals and Aminal ThioestersThe amide thioacetals 2 are obtained by reaction of the N,N-dimethylformamide dimethyl sulfate adduct 1 with sodium thiolates or by treatment of N,N-dimethylformamide diethyl acetal (3) with alkanthiols. Aminal thioesters 11 are formed by reaction of tetramethylformamidinium methyl sulfate (10) with alkali alkanethiolates or by treatment of aminal-tert-butylester 12 with alkanethiols. The compounds have properties similar to those of their oxygen homologues.
    Notes: Amidthioacetale 2 erhält man aus dem N,N-Dimethylformamid-Dimethylsulfat-Addukt 1 und Natriumthiolaten oder aus N,N-Dimethylformamid-diäthylacetal (3) und Alkanthiolen, Aminalthioester 11 aus Tetramethylformamidinium-methylsulfat (10) und Alkali-alkanthiolaten oder aus dem Aminal-tert-butylester 12 und Alkanthiolen. Die Verbindungen zeigen ähnliche Eigenschaften wie ihre Sauerstoff-Homologen.
    Additional Material: 2 Tab.
    Type of Medium: Electronic Resource
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  • 5
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 315 (1962), S. 283-290 
    ISSN: 0044-2313
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: The RAMAN- and TR-spectra of solid, fused, and dissolved (CH3)3SnOH and liquid (CH3)3SnOSn((CH3)3 are reported and the frequencies axe assigned. The spectra of Cl3SnOH and Cl3SnOCH3 · CH3OH are measured to establish the assignement of the SnO-stretching frequency. (CH3)3SnOH forms no H-bridges but associates building Sn-O-Sn-bridges. In aqueous solutions, (CH3)3SnOH is partially dissociated.
    Notes: Die RAMAN- und IR-Spektren des festen und in H2O bzw. CCl4 gelösten (CH3)3SnOH und des flüssigen (CH3)3SnOSn(CH3)3 werden mitgeteilt und die Frequenzen zugeordnet.Zur Sicherung der SnO-Valenzschwingung wurden außerdem die Spektren des Cl3SnOH und Cl3SnOCH3 · CH3OH gemessen. Die Spektren zeigen, daß das |CH3|3SnOH nicht über Wasserstoffbrücken, sondern über Sn-O-Sn-Brücken assoziiert. Der so erreichte Zustand ist offensichtlich sehr stabil, so daß das (CH3)3SnOSn(CH3)3 bereits bei Einwirkung kleinster Mengen Wasser in (CH3)3SnOH übergeht.In den wäßrigen Lösungen des (CH3)3SnOH treten neben undissoziierter Base (CH3)3Sn+-Kationen auf.
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
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  • 6
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 321 (1963), S. 224-233 
    ISSN: 0044-2313
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: The Raman and IR spectra of [(CH3)3SnOH]2 · (CH3)3SnBr, (CH3)3 SnOH · (CH3)3Br · H2O and [(CH3)3Sn]3OBr are reported and their frequencies are assigned. The distances of lattice planes are communicated. It is very probable that in these complex salts [(CH3)3Sn]+ cations exist besides (CH3)3SnOH and (CH3)3SnOSn(CH3)3, respectively. The association is caused by interaction of the oxygen of one constituent of the complex with the cation. In contrast to solid (CH3)3SnOH, in the complex compounds hydrogen bonds may exist between the OH groups. Bromide is arranged as ion within the external sphere.The strong hygroscopicity of [(CH3)3Sn]3 O Br results from the extremely low coordination of tin. The stabilities of the complex compounds are discussed in regard with coordination problems.
    Notes: Die Raman- und IR-Spektren von [(CH3)3SnOH]2 · (CH3)3SnBr, (CH3)3SnOH (CH3)3SnBr · H2O und [(CH3)3Sn]3OBr werden mitgeteilt, und die Frequenzen den einzelnen Normalschwingungen zugeordnet. Netzebenenabstände werden angegeben. In den Komplexsalzen liegen sehr wahrscheinlich [(CH3)3Sn]+-Ionen neben (CH3)3SnOH bzw. (CH3)3SnOSn-(CH3)3 vor. Die Assoziation erfolgt durch Wechselwirkung des Sauerstoffs des einen Komplexpartners mit dem Kation. Im Gegensatz zum festen (CH3)3SnOH sind in den Komplexverbindungen Wasserstoffbrückenbindungen zwischen den einzelnen OH-Gruppen sterisch möglich. Das Brom ist als Ion in der äußeren Sphäre gebunden. Die starke Hygroskopizität des [(CH3)3Sn]3 O Br beruht darauf, daß in diesem Komplex das Zinn koordinativ besonders wenig abgesättigt ist. Die Stabilität der Komplexe wird in Abhängigkeit vom Koordinationsproblem diskutiert.
    Additional Material: 4 Ill.
    Type of Medium: Electronic Resource
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