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  • 1
    Electronic Resource
    Electronic Resource
    Synthesis and crystal structure of New Amminecopper(II) Nitrates: [Cu(NH3)2](NO3)2 and [Cu(NH3)](NO3)2 (1996)
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 622 (1996), S. 2003-2007 
    Details
    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
    URL: http://dx.doi.org/10.1002/zaac.19966221132
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  • 2
    Electronic Resource
    Electronic Resource
    Synthesis and X-Ray Structure of New Copper(II) Nitrates: Cu(NO3)2 · H2O and β-modification of Cu(NO3)2 (1995)
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 621 (1995), S. 1261-1265 
    Details
    ISSN: 0044-2313
    Keywords: Copper(II) nitrates ; synthesis ; x-ray structure ; Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Darstellung und Kristallstruktur von neuen Nitraten des Kupfer(II): Cu(NO3)2 · H2O und β-Cu(NO3)2Blaue Kristalle von Cu(NO3)2 β H2O wurden durch Reaktion von CuO mit siedender 100% HNO3 dargestellt. Die stabile β-Modifikation des Cu(NO3)2 wurde durch Sublimation in einer evakuierten Ampulle im Temperaturgradienten von 150 bis 100°C innerhalb von 24 h erhalten.Cu(NO3)2 · H2O kristallisiert in der monoklinen Raumgruppe P21/c mit den Gitterkonstanten a = 6,377(1), b = 8,548(1), c = 9,769(1) Å, β = 100,41(1)°, Z = 4. β-Cu(NO3)2 ist orthorhombisch (Raumgruppe Pbcn) mit a = 14,161(5), b = 7,516(3), c = 12,886(2) Å, Z = 12. Beide Strukturen enthalten quadratisch planare CuO4-Einheiten mit Cu—O-Abständen von 1,92-2,02 Å. Es liegen weitere Cu—O Bindungen mit Abständen von 2,33 bzw. 2,35 Å sowie noch schwächere mit den Abständen 2,65-2,72 Å vor. In der Struktur des Cu(NO3)2 · H2O sind CuO4-Einheiten über NO3-Gruppen zu Zickzack-Ketten verbunden. Zusätzlich sind diese Ketten mittels schwächeren Cu—O Bindungen zu Schichten verbrückt. Im β-Cu(NO3)2 sind zwei Sorten von CuO4-Einheiten über NO3-Brücken zu einer dreidimensionalen Struktur verbunden.
    Notes: Blue crystals of a Cu(NO3)2 · H2O were synthesized by interaction of CuO with boiling 100% HNO3. Stable β-Cu(NO3)2 modification was obtained by the sublimation of copper(II) nitrate in evacuated ampoule over the 150→100°C temperature gradient for 24 hr.According to X-Ray single crystal analysis Cu(NO3)2 · H2O is monoclinic with a = 6.377(1), b = 8.548(1), c = 9.769(1) Å, β = 100.41(1)°, Z = 4, and space group P21/c. β-modification Cu(NO3)2 is orthorhombic with a = 14.161(5), b = 7.516(3), c = 12.886(2) Å, Z = 12, and space group Pbcn. In the both structures Cu atoms are square coordinated by 4 O atoms at the distances ranging from 1.92 to 2.02 Å. In each structure there are also additional Cu—O bonds with the distance of 2.33 or 2.35 Å and some weaker ones with the distances in the range of 2.65-2.72 Å. In the Cu(NO3)2 · H2O structure the [CuO4] squares are connected by the bridging NO3 groups into zigzag chains, which are linked into layers by the longer Cu—O bonds. In the β-Cu(NO3)2 structure the [CuO4] fragments of two types are joined by the bridging NO3 groups in a three-dimensional framework. Some correlations were found between N—O distances and coordination functions of O atoms.
    Additional Material: 3 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/zaac.19956210727
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