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  • single-crystals  (1)
  • μ-oxo bis [pentaammine vanadium(III)] iodide monoammoniate  (1)
  • 1
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 622 (1996), S. 2079-2082 
    ISSN: 0044-2313
    Keywords: Calcium imide CaNH ; preparation ; single-crystals ; structure determination ; Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Synthesis and Crystal Structure of Calcium Imide, CaNHSingle-crystals of calcium imide were obtained for the first time by the reaction of a mixture of calcium amide with sodium amide at 850°C in an autoclave for salt melts. After cooling the autoclave to room temperature the crystals are embedded in solid Na which was extracted by liquid ammonia. The structure of calcium imide was determined from single-crystal diffractometer data:space group Fm3m, Z = 4, a = 5.143(1) Å, R/Rw = 0.032/0.028 mit N(Fº2 ≤ 3σ(Fº2)) = 26, N(Var.) = 5.Ca and N atoms are arranged in the motif of the NaCl structure type. The hydrogen atoms of the imide groups are disordered within the Ca octahedra, and they occupy a six fold split position.
    Notes: Kristalle von Calciumimid wurden durch Aufheizen eines Gemenges von Calcium- und Natriumamid in einem Autoklav für Salzschmelzen auf 850°C zum ersten Mal erhalten. Nach Abkühlen des Autoklavs sind die Kristalle in festem Na eingebettet, das mit flüssigem NH3 extrahiert wurde. Die Struktur von CaNH wurde röntgenographisch aus Einkristall-Diffraktometerdaten bestimmt:Raumgruppentyp Fm3m, Z = 4, a = 5,143(1) Å, R/Rw = 0,032/0,028 mit N(Fº2 ≤ 3σ(Fº2)) = 26, N(Var.) = 5.Ca- und N-Atome sind nach dem Motiv des NaCl-Strukturtyps angeordnet. Die Wasserstoffatome der Imidgruppen sind fehlgeordnet und besetzen in den Oktaedern von Ca eine Splitlage mit sechs Aufenthaltsmaxima.
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 622 (1996), S. 2074-2078 
    ISSN: 0044-2313
    Keywords: μ-oxo bis [pentaammine vanadium(III)] iodide monoammoniate ; μ-oxo bis [pentaammine titanium(III)] iodide monoammoniate ; preparation ; crystal structure ; IR spectroscopy ; Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Darstellung, Kristallstruktur und IR-spektroskopische Untersuchungen an [(NH3)5V—O—V(NH3)5]I4 · NH3 und [(NH3)5Ti—O—Ti(NH3)5]I4 · NH3Reaktionen von VI2 bzw. TiI3 mit Ammoniak in Gegenwart von Wasser- bzw. Sauerstoffspuren führen zu [(NH3)5M—O—M(NH3)5]I4 · NH3 mit M = V, Ti. Ihre Strukturen wurden röntgenographisch an Einkristallen bestimmt:Pbca (Nr. 61), Z = 4, M = V: a = 12,482(4) Å, b = 14,819(6) Å, c = 13,286(5) Å, Z(Fo2 ≤ 3σFo2) = 983, Z(Variablen) = 88, R/Rw = 0,053/0,063, M = Ti: a = 12,628(4) Å, b = 14,970(4) Å, c = 13,359(3) Å, Z(Fo2 ≤ 3σFo2) = 1188, Z(Variablen) = 88, R/Rw = 0,043/0,047Die Strukturen bauen sich aus Oktaederdoppeleinheiten [(NH3)5M—O—M(NH3)5]4+ mit ekliptischer Konformation auf, deren verbrückende Sauerstoffatome nach dem Motiv einer verzerrten, kubisch flächenzentrierten Packung angeordnet sind. IR-spektroskopische Daten von undeuterierten und zu 5% deuterierten Proben der Vanadiumverbindung weisen auf N—H … I-Wasserstoffbrückenbindungen und π-Bindungsanteile zwischen dem jeweiligen Übergangsmetall und dem verbrückenden Sauerstoffatom hin.
    Notes: The reaction of VI2 or TiI3, respectively, with ammonia in the presence of traces of water or oxygen, respectively, leads to [(NH3)5M—O—M(NH3)5]I4 · NH3 with M = V, Ti. Their structures were solved by X-ray single crystal data:Pbca (No. 61), Z = 4, M = V: a = 12.482(4) Å, b = 14.819(6) Å, c = 13.286(5) Å, N(Fo2 ≤ 3σFo2) = 983, N(variables) = 88, R/Rw = 0.053/0.063, M = Ti: a = 12.628(4) Å, b = 14.970(4) Å, c = 13.359(3) Å, N(Fo2 ≤ 3σFo2) = 1188, N(variables) = 88, R/Rw = 0.043/0.047.The structures consist of corner sharing octahedra double units [(NH3)5M—O—M(NH3)5]4+ with eclipsed conformation which are stacked together according to the motif of a distorted cubic face centered arrangement for the bridging oxygen atoms. IR spectroscopic investigations of the undeuterated vanadium compound and of 5% deuterated samples hint to N—H … I hydrogen bridge bonds and to remarkable π-bonding between the transition metal and the bridging oxygen atoms.
    Additional Material: 3 Ill.
    Type of Medium: Electronic Resource
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