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  • 1
    ISSN: 1572-9982
    Source: Springer Online Journal Archives 1860-2000
    Topics: Economics
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    Oxford, UK : Blackwell Publishing Ltd
    Annals of the New York Academy of Sciences 516 (1987), S. 0 
    ISSN: 1749-6632
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Natural Sciences in General
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  • 3
    ISSN: 1572-9982
    Source: Springer Online Journal Archives 1860-2000
    Topics: Economics
    Type of Medium: Electronic Resource
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  • 4
    ISSN: 1572-9982
    Source: Springer Online Journal Archives 1860-2000
    Topics: Economics
    Type of Medium: Electronic Resource
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  • 5
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 546 (1987), S. 48-54 
    ISSN: 0044-2313
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Twisted Tetrahedra Chains ∞1[Li(NH2)4/2-] in the Structure of the Hexagonal Modification of Cesium Lithium Amide, CsLi(NH2)2The ternary amides, CsLi(NH2)2 (dimorphous) and CsLi2(NH2)3, were prepared by reaction of the metals with ammonia in high pressure autoclaves. The structure of the hexagonal modification of CsLi(NH2)2 was established inclusive the hydrogen atom positions from single crystal x-ray data. The compound crystallizes in the space group P6222 with N = 3. The lattice parameters are a = 6.331(1) Å and c = 8.410(1) Å.Lithium ions occupy distorted nitrogen tetrahedra. These tetrahedra are connected by translocated edges along [001]. The cesium ions combine the equally oriented chains ∞1[Li(NH2)4/2-]. The amide ions are twisted out of the hexagonal aa-plane. If we assume sp3-hybridized valence electrons of the nitrogen atoms the bonding interaction between free electron pairs and lithium ions are thereby strenghtened.
    Notes: Ternäre Amide im System CsNH2/LiNH2—CsLi(NH2)2 (dimorph) und CsLi2(NH2)3 - wurden durch Umsetzung der Metalle mit NH3 in Hochdruckautoklaven dargestellt.Die Struktur der hexagonalen Form von CsLi(NH2)2 wurde aus Röntgenbeugungsintensitäten eines Einkristalls einschließlich der H-Atom-Lagen bestimmt. Die Verbindung kristallisiert in der Raumgruppe P6222 mit Z = 3 und den Gitterkonstanten a = 6,331(1) Å und c = 8,410(1) Å.Die Lithiumionen befinden sich in verzerrten Stickstofftetraedern. Diese bilden über transständige Kanten längs [001] Ketten. Die Caesiumionen verknüpfen die gleichsinnig orientierten Ketten ∞1[Li(NH2)4/2-]. Die Amidionen sind aus der hexagonalen aa-Ebene gedreht. Bei einer sp3-Hybridisierung der Valenzelektronen der Stickstoffatome wird dadurch die Wechselwirkung zwischen freien Elektronenpaaren und den Lithiumionen begünstigt.
    Additional Material: 4 Ill.
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  • 6
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Journal of High Resolution Chromatography 12 (1989), S. 685-688 
    ISSN: 0935-6304
    Keywords: Capillary gas chromatography ; Ultra narrow-bore FSOT columns ; Cellular FAME analysis ; Automatic profile recognition ; Microorganisms identification ; Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Additional Material: 5 Ill.
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  • 7
    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.
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  • 8
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 546 (1987), S. 42-47 
    ISSN: 0044-2313
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Rubidium Hexaamidolanthanate and -neodymate, Rb3[La(NH2)6] and Rb3[Nd(NH2)6]; Compounds. Structurally Related to K3[Cr(OH)6] and K4CdCl6Colourless Rb3[La(NH2)6] (a = 12.298(4) Å, c = 13.759(2) Å, N = 6, R3c) and pale blue Rb3[Nd(NH2)6] (a = 12.199(6) Å, c = 13.626(4) Å, N = 6, R32) have been prepared by the reaction of the corresponding metals (Rb: La resp. Nd = 3:1) with NH3(P(NH3) = 4-4.5 kbar) at 300°C. Single crystal x-ray methods gave their structures. It is shown by space group relations that these compounds are structurally related to one another and to further ternary amides as well as to K3[Cr(OH)6] and K4CdCl6.
    Notes: Farbloses Rb3[La(NH2)6] (a = 12,298(4) Å, c = 13,759(2) Å, Z = 6, R3c) und hellblaues Rb3[Nd(NH2)6] (a = 12,199(6) Å, c = 13,626(4) Å, Z = 6, R32) wurden durch Umsetzung der entsprechenden Metalle (Rb: La bzw. Nd = 3:1) mit NH3 (P(NH3) = 4-4,5 kbar) bei 300°C dargestellt. Die Atomanordnung der Verbindungen wurde röntgenographisch an Einkristallen bestimmt. Über Raumgruppenbeziehungen wird die Strukturverwandtschaft zu weiteren ternären Amiden sowie zu K3[Cr(OH)6] und K4CdCl6 erläutert.
    Additional Material: 2 Ill.
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  • 9
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 544 (1987), S. 55-73 
    ISSN: 0044-2313
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Bonding Conditions in Crystalline Phases of CsOH and CsODThe crystalline phases of CsOH and CsOD have been investigated between 23 K and the melting point by x-ray and neutron diffraction experiments as well as by calorimetric, IR, and Ramanspectroscopic measurements. For crystal data see „Inhaltsübersicht“.In the modification stable at low temperatures which resembles a TlI-type like structure the charge-asymmetric hydroxide ions are onedimensional hydrogen bonded. Certain forms of movements of the anions occur by warming up. In the high temperature NnC1-type structure the anions rotate quasi freely.The results of the various methods of investigation of the alkali metal hydroxides in the solid state are discussed with respect to the chemical bonding in these compounds.
    Notes: Die kristallinen Phasen von CsOH und CsOD wurden zwischen 23 K und dem Schmelzpunkt mit Röntgen- und Neutronenbeugungsexperimenten sowie mit kalorimetrischen, IR- und Ramanspektroskopischen Messungen untersucht:In CsOD (TlI-typ) bilden die ladungsasymmetrischen Hydroxidionen bei tiefen Temperaturen eindimensional unendliche Wasserstoffbrückenbindungen aus. Bei Erwärmen werden diese gelöst. Es treten unterschiedliche Formen von Anionenbewegungen auf. In der NaCl-Hochtemperaturform rotiert das Hydroxidion quasifrei.Die mit den verschiedenartigen Meßmethoden erzielten Ergebnisse lassen Schlüsse auf die Bindungsverhältnisse in den festen Alkalimetallhydroxidphasen zu. Sie werden zusammenfassend diskutiert.
    Additional Material: 3 Ill.
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  • 10
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 531 (1985), S. 125-139 
    ISSN: 0044-2313
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Lithium Aluminium Amide, LiAl(NH2)4-Preparation, X-Ray Investigation, I.R.Spectrum, and Thermal DecompositionThe reaction of lithium and aluminium with liquid ammonia gives LiAl(NH2)4 within some days at temperatures from 80-100°C. Crystals for an X-ray structure determination must be grown very slowly from liquid NH3 starting with thoroughly pulverized amide. The structure analysis was successful including the determination of the positions of the hydrogen atoms of the amide ions. Space group: P21/n; lattice constants: a = 9.478(1) Å, b = 7.351(1) Å, c = 7.398(1) Å, β = 90.26(1)°; Z = 4, R-values (unweighted, weighted with w = 1): 0.042/0.046. The atomic arrangement of LiAl(NH2)4 can formally be described as a new variant of the GaPS4-type structure. The compound is characterized too by its i.r. spectrum.The thermal degradation of LiAl(NH2)4 gives at 180°C amorphous Al2(NH)3 and crystalline LiNH2; at 220°C results already very fine AlN. Above 400°C this AlN reacts with LiNH2 or Li2NH forming Li3AlN2.
    Notes: Durch Umsetzung von Lithium und Aluminium mit flüssigem Ammoniak bei 80-100°C entsteht innerhalb weniger Tage LiAl(NH2)4. Kristalle für eine röntgenographische Strukturbestimmung erhält man bei langsamen Wachstum aus flüssigem NH3 ausgehend von feinteiligem ternären Amid.Die Aufklärung der Atomanordnung gelang einschließlich der H-Lagenbestimmung an den NH2--Ionen. Raumgruppe: P21/n; Gitterkonstanten: a = 9,478(1) Å, b = 7,351(1) Å, c = 7,398(1) Å, β = 90,26(1)°; Z = 4, R-Werte (ungew./gew. mit w = 1): 0,042/0,046. Die Atomanordnung von LiAl(NH2)4 kann formal als eine neue Variante der GaPS4-Struktur aufgefaßt werden. Die Verbindung wird weiterhin durch ihr IR-Spektrum charakterisiert.Bei der thermischen Zersetzung von LiAl(NH2)4 bildet sich bei 180°C amorphes Al2(NH)3 neben gut kristallinem LiNH2; bei 220°C liegt bereits feinteiliges AlN vor. Oberhalb 400°C reagiert dieses AlN mit LiNH2 bzw. Li2NH zu Li3AlN2.
    Additional Material: 6 Ill.
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