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  • IR Spectra  (1)
  • N-(tri-t-butoxysilyl)-p-nitroaniline, C18H32N2O5Si  (1)
  • Asymmetric [As3]7- anion
  • 1990-1994  (2)
  • 1
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 620 (1994), S. 377-384 
    ISSN: 0044-2313
    Keywords: One-pot reactions of tri-t-butoxychlorosilane, K-t-butanolate and substituted anilines. Crystal structure analyses of N-(tri-t-butoxysilyl)-aniline, C18H33NO3Si ; N-(tri-t-butoxysilyl)-p-nitroaniline, C18H32N2O5Si ; N-Methyl-(N-tri-t-butoxysilyl)-p-nitroaniline C19H34N2O5Si ; N-(tri-t-butoxysilyl)-p-cyanoaniline, C19H32N2O3Si ; Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Formation and Structures of N-(tri-t-butoxysilyl)aniline CompoundsPara-substituted N-(tri-t-butoxysilyl)anilines (t-BuO)3SiNRC4H4X-p, R = H, CH3, with substituents of high electron affinity (X = CN, NO2) were prepared by a one-pot reaction of tri-t-butoxychlorsilane, potassium t-butanolate and substituted anilines. Corresponding compounds with substituents of low electron affinity (X = OMe, H) preferably were prepared by metalation of anilines with sodium amide. Four crystal structures were determined. N-(tri-t-butoxysilyl)-p-nitro-aniline, N-methyl-(N-tri-t-butoxysilyl)-p-nitroaniline and N-(tri-t-butoxysilyl)-p-cyanoaniline crystallize at 298 K monoclinically, N-(tri-t-butoxysilyl)aniline crystallizes orthorhombically.
    Notes: Derivate des para-substituierten N-(Tri-t-butoxysilyl)anilins (t-BuO)3SiNRC6H4X-p, R = H, CH3 mit Substituenten hoher Elektronenaffinität (X = CN, NO2) wurden nach einem neuen Eintopfverfahren aus Tri-t-butoxychlorsilan, Kalium-t-butanolat und dem entsprechend substituierten Anilin dargestellt. Für Substituenten niederer Elektronenaffinität (X = OMe, H) wird die Methode der Metallierung von Anilinen mit Natriumamid bevorzugt. Vier Kristallstrukturen wurden bestimmt. N-(Tri-t-butoxysilyl)-p-nitroanilin, N-Methyl-(N-tri-t-butoxysilyl)-p-nitroanilin und N-(Tri-t-butoxysilyl)-p-cyanoanilin kristallisieren bei 298 K monoklin, N-(Tri-t-butoxysilyl)anilin kristallisiert orthorhombisch.
    Additional Material: 4 Ill.
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  • 2
    ISSN: 0044-2313
    Keywords: Octa-μ3-bromo-hexahalogeno-octahedro-hexamolybdate(2-)-Anions ; Synthesis ; Crystal Structure ; Raman ; IR Spectra ; Normal Coordinate Analysis ; 95Mo NMR ; 19F NMR ; Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Synthesis, Crystal Structure and Spectroscopic Properties of the Cluster Anions [(Mo6Br8i)X6a]2- with Xa = F, Cl, Br, IThe tetrabutylammonium (TBA), tetraphenylphosphonium (TPP) and tetraphenylarsonium (TPAs) salts of the octa-μ3-bromo-hexahalogeno-octahedro-hexamolybdate(2-) anions [(Mo6Br8i)X6a]2- (Xa = F, Cl, Br, I) are synthesized from solutions of the free acids H2[(Mo6Br8i)X6a] · 8 H2O with Xa = Cl, Br, I. The crystal structures show systematic stretchings in the Mo—Mo bond length and a slight compression of the Bri8 cube in the Fa to Ia series. The cations do not change much.The i.r. and Raman spectra show at 10 K almost constant frequencies of the (Mo6Bri8) cluster vibrations, whereas all modes with Xa ligand contribution are characteristically shifted. The most important bands are assigned by polarization measurements and the force constants are derived from normal coordinate analysis. The 95Mo nmr signals are shifted to lower field with increasing electronegativity of the Xa ligands. The fluorine compound shows a sharp 19F nmr singlet at -184.5 ppm.
    Notes: Die Tetrabutylammonium(TBA)-, Tetraphenylphosphonium(TPP)- und Tetraphenylarsonium(TPAs)-Salze der Octa-μ3-bromo-hexahalogeno-octahedro-hexamolybdat-(2-)-Anionen [(Mo6Br8i)X6a]2- mit Xa = F, Cl, Br, I sind aus den Lösungen der freien Säuren H2[(Mo6Br8i)X6a] · 8 H2O mit Xa = Cl, Br, I dargestellt worden. Die Kristallstrukturen zeigen eine systematische Verlängerung der (Mo—Mo)-Bindungsabstände und eine geringfügige Kontraktion der Bri8-Würfel beim Übergang Fa → Ia. Der Kationeneinfluß ist gering.Die IR- und Raman-Spektren ergeben bei 10 K für das Clustergerüst (Mo6Bri8) nahezu lagekonstante Schwingungen, während alle Moden, an denen die Xa-Liganden beteiligt sind, charakteristische Verschiebungen aufweisen. Die wichtigsten Banden werden durch Polarisationsmessungen zugeordnet und die Bindungskraftkonstanten durch Normalkoordinatenanalysen ermittelt. Die 95Mo—NMR-Signale werden mit zunehmender Elektronegativität der Xa-Liganden zu tiefem Feld verschoben. Die Fluorverbindung liefert im 19F—NMR ein scharfes Singulett bei -184,5 ppm.
    Additional Material: 3 Ill.
    Type of Medium: Electronic Resource
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