ALBERT

All Library Books, journals and Electronic Records Telegrafenberg

feed icon rss

Your email was sent successfully. Check your inbox.

An error occurred while sending the email. Please try again.

Proceed reservation?

Export
  • 1
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 546 (1987), S. 33-41 
    ISSN: 0044-2313
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Potassium Hexaydroxochromate(III), K3[Cr(OH)6]: An Example for a New Synthetic Way to Metal Hydroxides and HydroxometallatesThe comproportionation of nitrate with amide ions in supercritical ammonia leads to the formation of hydroxide ions and elementary nitrogen: [Cr(NH3)6](NO3)3 reacts with KNH2 at 250°C and 6 kbar NH3-pressure to K3[Cr(OH)6], K(H2O)OH and an unknown yellow microcrystalline phase. The bluegreen hydroxochromate is well crystallized.The x-ray structure determination on K3[Cr(OH)6] gave the atomic arrangement inclusive the hydrogen position. The unit cell with a = 10.672(4) Å and c = 11.083(3) Å contains six formular units; the space group is R3c. The chemical bonding in this compound is discussed.
    Notes: Die Komproportionierung von Nitrat- mit Amidionen in überkritischem Ammoniak ergibt Hydroxidionen und elementaren Stickstoff: [Cr(NH3)6](NO3)3 reagiert mit KNH2 bei 250°C und 6 kbar NH3-Druck zu K3[Cr(OH)6]. Die blaugrüne Verbindung bildet sich gut kristallisiert neben K(H2O)OH und einer gelben, feinteiligen, in der Zusammensetzung bisher ungeklärten Phase.Die Atomanordnung in K3[Cr(OH)6] wurde röntgenographisch einschließlich der Wasserstoffposition bestimmt. Die Elementarzelle mit a = 10,672(4) Å und c = 11,083(3) Å enthält sechs Formeleinheiten; die Raumgruppe ist R3c. Die Bindungsverhältnisse in dieser Verbindung werden diskutiert.
    Additional Material: 4 Ill.
    Type of Medium: Electronic Resource
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
  • 2
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 569 (1989), S. 111-116 
    ISSN: 0044-2313
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Preparation and Crystal Structure of Lithiumhydrogensulfide, LiHSLithiumhydrogensulfide, LiHS, is prepared from lithiumamide, LiNH2, by reaction with liquid hydrogensulfide. At 150°C the solubility of LiHS in H2S is sufficient for the growth of single crystals in a temperature gradient within the autoclaves used. The X-ray structure determination at 295 K is characterized by the following data: \documentclass{article}\pagestyle{empty}\begin{document}$$ \begin{array}{*{20}c} {{{{\rm P4}_{\rm 2} } \mathord{\left/ {\vphantom {{{\rm P4}_{\rm 2} } {{\rm mmc,\;Z = 2,\;a = 3.916}\left({\rm 2} \right){\AA},\;c = 6.155\left(2 \right){\AA},}}} \right. \kern-\nulldelimiterspace} {{\rm mmc,\;Z = 2,\;a = 3.916}\left({\rm 2} \right){\AA},\;c = 6.155\left(2 \right){\AA},}}} \hfill \\ {{\rm Z}\left({{\rm F}_{\rm 0}^{\rm 2} \ge 3\sigma \;{\rm F}_{\rm 0}^{\rm 2} } \right) = 74,\;{\rm R = 0.011}{\rm .}} \hfill \\\end{array} $$\end{document} Lithium occupies tetrahedral sites in a distorted cubic close-packed arrangement of S; in PtS sulfur occupies tetrahedral sites in a similar way in a distorted close packing of Pt. Hydrogen atoms of the HS--ions are dynamically disordered in a split position linearly bound to S. At 228 K a thermal effect occurs in DSC-measurements indicating that below this temperature the HS--ion has fixed positions.
    Notes: Zur Darstellung von Lithiumhydrogensulfid, LiHS, wurde Lithiumamid, LiNH2, in flüssigem Schwefelwasserstoff protolysiert. Bei 150°C reicht die Löslichkeit von LiHS in H2S für die Einkristallzüchtung im Temperaturgefälle von Autoklaven aus. Die röntgenographische Strukturbestimmung bei 295 K ist durch folgende Daten charakterisiert: \documentclass{article}\pagestyle{empty}\begin{document}$$ \begin{array}{*{20}c} {{{{\rm P4}_{\rm 2} } \mathord{\left/ {\vphantom {{{\rm P4}_{\rm 2} } {{\rm mmc,\;Z = 2,\;a = 3,916}\left({\rm 2} \right){\AA},\;c = 6,155\left(2 \right){\AA},}}} \right. \kern-\nulldelimiterspace} {{\rm mmc,\;Z = 2,\;a = 3,916}\left({\rm 2} \right){\AA},\;c = 6,155\left(2 \right){\AA},}}} \hfill \\ {{\rm Z}\left({{\rm F}_{\rm 0}^{\rm 2} \ge 3\sigma\; {\rm F}_{\rm 0}^{\rm 2} } \right) = 74,\;{\rm R = 0,011}{\rm .}} \hfill \\\end{array} $$\end{document} In einer verzerrt kubisch flächenzentrierten Anordnung von S besetzt Li Tetraederlücken wie S in der ähnlich verzerrten Kugelpackung von Pt in PtS. Die Hydrogenatome der HS--Ionen sind in zwei linear über S verbundenen Positionen dynamisch fehlgeordnet. DSC-Messungen zeigen bei 228 K einen thermischen Effekt, der die Lagefixierung des HS--Ions vermuten läßt.
    Additional Material: 3 Ill.
    Type of Medium: Electronic Resource
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
  • 3
    Electronic Resource
    Electronic Resource
    New York : Wiley-Blackwell
    Journal of Polymer Science: Polymer Letters Edition 20 (1982), S. 151-158 
    ISSN: 0360-6384
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Additional Material: 4 Ill.
    Type of Medium: Electronic Resource
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
Close ⊗
This website uses cookies and the analysis tool Matomo. More information can be found here...