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  • 1
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 622 (1996), S. 2003-2007 
    ISSN: 0044-2313
    Keywords: Amminecopper(II) nitrate ; synthesis ; x-ray structure ; Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Darstellung und Kristallstuktur von neuen Amminkupfer(II)-Nitraten: [Cu(NH3)2](NO3)2 und [Cu(NH3)(NO3)2[CU(NH3)2](NO3)2 (I) und [Cu(NH3)](NO3)2 (II) wurden durch Reaktion von geschmolzenem NH4NO3 mit [Cu(NH3)4](NO3)2 bzw. Cu(NO3)2 · 3 H2O bei 180 - 195°C innerhalb von 24 h dargestellt. I ist orthorhombisch (Raumgruppe Pbca) mit a = 5.678(2), b = 9.765(2), c = 11.596(2) Å, Z = 4, R = 0.060. II kristallisiert in der monoklinen Raumgruppe P21/c mit den Gitterkonstanten a = 6.670(1), b = 8.658(2), c = 9.661(2) Å, β = 101.78(2)°, Z = 4, R = 0.027.In beiden Strukturen weist Cu eine schwach verzerrte quadratische Koordination durch N (von NH3) und O (von NO3-Gruppen) auf. Die Struktur von I besteht aus den zentrosymmetrischen planaren Molekülen [Cu(NH3)2](NO3)2 mit den Cu—N bzw. Cu—O Abständen 1.95 bzw. 2.01 Å. Die Moleküle sind wohl über H-Bindungen miteinander verbunden. In II betragen die Abstände Cu—O 1.96, 2.03 und 2.03 Å; d(Cu—N) ist 1.95 Å. Die [CuO3NH3] Quadrate sind über NO3-Gruppen zu Zickzack-Ketten verbunden. Diese sind zusätzlich über schwächere Cu—O Bindungen (2.31 Å) zu Schichten verknüpft. Die Schichten sind durch H-Bindungen zusätzlich verstärkt und miteinander verbrückt.
    Notes: [Cu(NH3)2](NO3)2 (I) and [Cu(NH3](NO3)2 (II) were synthesized by interaction of molten NH4NO3 with [Cu(NH3)4](NO3)2 and Cu(NO3)2 · 3 H2O, respectively, at 180 to 195°C for 24 hr. According to X-Ray single crystal analysis, I is orthorhombic (sp. gr. Pbca) with a = 5.678(1), b = 9.765(2), c = 11.596(2) Å, Z = 4, R = 0.060; II is monoclinic (sp. gr. P21/c) with a = 6.670(1), b = 8.658(2), c = 9.661(2) Å, β = 101.78(2)°, Z = 4, R = 0.027.In both structures, the nearest coordination environment of Cu is a slightly distorted square formed by N (from NH3) and O atoms (from NO3 groups). The structure of I consists of centrosymmetrical [Cu(NH3)2](NO3)2 molecules linked by hydrogen bonds. The Cu—N and Cu—O distances are 1.98 and 2.01 Å, respectively. In II, the Cu—N distance is 1.95 Å, the Cu—O distances are 1.96, 2.02, and 2.03 Å. The [CuO3NH3] squares are connected by NO3 bridges into zigzag chains, which are linked into layers by longer Cu—O interactions (2.31 Å). Obviously, the layers are additionally strengthened and held together by hydrogen bonds.
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
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