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  • 1
    ISSN: 1572-9001
    Keywords: Titanium(IV) chelates ; tridentate diacidic ligands ; donor set ONO(S) ; 13C-CP/MAS-NMR spectra ; crystal structure of bis[benzoylacetone thiobenzoylhydrazonato(2-)]titanium(IV)
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract A series of tridentate diacidic ligands having the donor set ONO(S) as well as the corresponding titanium(IV) chelates were studied by13C-CP/MAS-NMR spectroscopy. Structural changes caused by the complex formation are discussed. The crystal structure of bis[benzoylacetone thiobenzo-ylhydrazonato(2-)]titanium(IV) was determined by X-ray analysis as to be distorted trigonal prismatic. Orthorhombic space group Pca2l,Z=4, 3304 observed independent reflections, unit-cell parameters at 298 K:a=22,808(2) å,b=13,073(4) å,c=10,450(4) å.
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 594 (1991), S. 179-190 
    ISSN: 0044-2313
    Keywords: Silanes ; bis(trimethylsily1)amino-substituted silanes ; syntheses ; i. r., 1H, 29Si n.m.r. data ; Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Bis(trimethylsilylamino)-substituted Silanes  -  Syntheses and Spectroscopic InvestigationsThe bis(trimethylsilyl)aminosubstituted silanes Me3-n[(Me3Si)2N]nSiH (n = 1, 2), Me[(Me3Si)2N]ClSiH, and [(Me3Si)2N]3-nClnSiH (n = 1, 2) were obtained by the reaction of the amides (Me3Si)2NLi with the chlorosilanes Me3-nClnSiH (n = 1-3). In the reaction of the amides (Me3Si)2NLi with Cl3SiH in the molar ratio 3:1 [(Me3Si)2N]2ClSiH is formed only. [(Me3Si)2N]3SiH was prepared by interaction of the lithium silylamides [(Me3Si)2N](Me3SiNLi)2SiH with Me3SiCl. The reaction of the lithium silylamides Me(Me3SiNLi)2SiH with Me3SiCl gave the substitution product Me[(Me3Si)2N]2SiH and the cyclodisilazanes (I: R = R′ = Me3SiNH; II: R = Me3SiNH, R′ = (Me3Si)2N).The i.r., 1H n.m.r., and some 29Si n.m.r. data of the compounds are given. The frequencies of the Si-H stretching vibration, the 29Si—1H coupling constants, and the 29Si n.m.r. chemical shifts of the Si(H) signals of the silanes Me3-n[(Me3Si)2N]nSiH (n=1-3) depend on the number of bis (trimethylsily1)amino substituents. For some silanes a splitting of the v(SiH) band was found. This is assumed to be due t o the existence of rotational isomers. Rotational isomeres are indicated by 29Si and 13C n.m.r. spectra for [(Me3Si)2N]3SiH.
    Notes: Durch Reaktion von (Me3Si)2NLi mit den Chlorsilanen Me3-nClnSiH (n = 1-3) wurden die bis(trimethylsilyl)aminosubstituierten Silane Me3-n[(Me3Si)2N]nSiH (n=1, 2), Me[(Me3Si)2N]ClSiH und [(Me3Si)2N]3-nClnSiH (n = 1, 2) erhalten. Bei der Umsetzung von (Me3Si)2NLi mit Cl3SiH im Molverhältnis 3:1 entstand nur [(Me3Si)2N]2ClSiH. [(Me3Si)2N]3SiH wurde durch Reaktion des Lithiumsilylamides Me(Me3SiNLi)2SiH mit Me3SiCl dargestellt. Die Reaktion des Lithiumsilylamides Me(Me3SiNLi)2SiH mit Me3SiCl ergab das Substitutionsprodukt Me[(Me3Si)2N]2SiH und die Cyclodisilazane (I: R = R′ = Me3SiNH; II: R = Me3SiNH, R′ = (Me3Si)2N).Die IR-, 1H-NMR- und teilweise die 29Si-NMR-Daten der Verbindungen sind angegeben. Die Bandenlagen der Si—H-Valenzschwingungen, die 29Si—1H-Kopplungskonstanten und die 29Si-NMR-chemischen Verschiebungen des Si(H)-Signals der Silane Me3-n[(Me3Si)2N]nSiH (n = 1-3) sind von der Anzahl der Bis(trimethylsilyl)aminosubstituenten abhängig.In einigen Silanen wurde eine Aufspaltung der v(SiH)-Bande gefunden. Als Ursache wird das Vorliegen von Rotationsisomeren angenommen. Für das Silan [(Me3Si)2N]3SiH zeigten auch 29Si-und 13C-NMR-spektroskopische Messungen Rotationsisomere an.
    Additional Material: 4 Tab.
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