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  • 1
    Electronic Resource
    Electronic Resource
    Literaturkarusell. Chemie (1999)
    Weinheim : Wiley-Blackwell
    Chemie in unserer Zeit 33 (1999), S. IX 
    Details
    ISSN: 0009-2851
    Keywords: Chemistry ; Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/ciuz.19990330518
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  • 2
    Electronic Resource
    Electronic Resource
    Editorial (1999)
    Weinheim : Wiley-Blackwell
    Chemie in unserer Zeit 33 (1999), S. 318-318 
    Details
    ISSN: 0009-2851
    Keywords: Chemistry ; Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/ciuz.19990330602
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  • 3
    Electronic Resource
    Electronic Resource
    Editorial (1999)
    Weinheim : Wiley-Blackwell
    Chemie in unserer Zeit 33 (1999), S. 4-4 
    Details
    ISSN: 0009-2851
    Keywords: Chemistry ; Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/ciuz.19990330102
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  • 4
    Electronic Resource
    Electronic Resource
    Literaturkarusell. Chemie (1999)
    Weinheim : Wiley-Blackwell
    Chemie in unserer Zeit 33 (1999), S. X 
    Details
    ISSN: 0009-2851
    Keywords: Chemistry ; Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/ciuz.19990330218
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  • 5
    Electronic Resource
    Electronic Resource
    Methyltrioxorhenium (1999)
    Weinheim : Wiley-Blackwell
    Chemie in unserer Zeit 33 (1999), S. 192-198 
    Details
    ISSN: 0009-2851
    Keywords: Chemistry ; Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Additional Material: 13 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/ciuz.19990330403
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  • 6
    Electronic Resource
    Electronic Resource
    Hard Acid and Soft Base Stabilisation of Di- and Trimercury Cations in Benzene Solution - A Spectroscopic, X-ray Scattering, and Quantum Chemical Study (1999)
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 1999 (1999), S. 633-642 
    Details
    ISSN: 1434-1948
    Keywords: Mercury cations ; Subvalent compounds ; Ab initio calculations ; Liquid X-ray scattering ; Chemistry ; General Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Hg2Cl2 dissolves in GaCl3/benzene solution to yield Hg22+ and chlorogallate(III) ions, GanCl3n+1-. In such solutions, Hg22+ can be reduced to Hg32+ by metallic mercury. Solubility measurements show that one mol of Hg is oxidised per mol of Hg22+. The Hg32+ ion gives a strong band at 110 cm-1 in the Raman spectrum and Hg-Hg correlations at about 2.60 and 5.15 Å in the radial distribution function obtained by liquid X-ray scattering. - Hg32+ can also be synthesised in high yield by direct oxidation of metallic mercury by GaIII in GaCl3/benzene solution. In contrast, mercury is insoluble in neat liquid GaCl3 and only sparingly soluble in GaCl3/KCl melts. It therefore seems likely that the thermodynamic stabilisation of subvalent mercury species in benzene solution not only relies on the traditional acid stabilisation provided by the hard Lewis acid GaCl3, but also on a “soft-base stabilisation” provided by interactions between the aromatic molecules and the cations. Evidence for such specific interactions between Hgm2+ cations and C6H6 are observed in the Raman spectra: The totally symmetric C6H6 band at 991 cm-1 is found to split in the presence of Hgm2+ ions and to give new peaks at 978 (m = 2) and 982 (m = 3) cm-1. - In order to further elucidate the cluster-arene interactions, ab initio and density functional calculations were performed for the model compounds Hgm(C6H6)22+ and HgmCl2(C6H6)2, m = 2 and 3. The calculations show that both models represent coordinations modes which are feasible for Hgm2+ ions. However, the calculated vibrational frequencies for the Hgm(C6H6)22+ models with η1/quasi-η3 coordination of the benzene molecules along the Hg-Hg vector are most consistent with the body of experimental and literature data. The counterions are thus suggested to occupy secondary coordination sites.
    Additional Material: 7 Ill.
    Type of Medium: Electronic Resource
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  • 7
    Electronic Resource
    Electronic Resource
    Tetraazido Complexes of Aluminium, Gallium, and Indium (1999)
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 2000 (1999), S. 455-461 
    Details
    ISSN: 1434-1948
    Keywords: Aluminium ; Gallium ; Indium ; Azide ; Rietveld ; Chemistry ; General Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: The new tetraazido complexes of aluminium, gallium, and indium [thf2Na][thf2Al(N3)4] (1), [py2Na][py2In(N3)4] (2), and Na[Ga(N3)4] (3) have been synthesized from MCl3 and NaN3 by salt metatheses and characterized by X-ray diffraction analysis. In compounds 1 and 2, the Group 13 metal atom and the sodium atom are each hexacoordinated by four azido groups and two additional solvent molecules. The azido groups act as μ(1,3)-bridging ligands between the Group 13 metal and sodium, thereby forming network structures. In contrast, complex 3 is solvent-free and exhibits a tetracoordinated gallium centre and a heptacoordinated sodium atom. The structure of 3 has also been investigated by means of X-ray powder data and the Rietveld method and the results are compared with the single-crystal data.
    Additional Material: 9 Ill.
    Type of Medium: Electronic Resource
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  • 8
    Electronic Resource
    Electronic Resource
    Self-Assembly of Pyrazolyl Based Ligands and Silver Cation into Metallamacrocycles and Tubular Coordination Networks (1999)
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 1999 (1999), S. 1981-1985 
    Details
    ISSN: 1434-1948
    Keywords: Pyrazole ; Silver ; Metallacycles ; Macrocycles ; Self-assembly ; Chemistry ; General Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: The 2,6-bis(pyrazolyl)pyrazine ligand 1 forms a 2,2-metallamacrocycle 3, composed of two ligands and two cations, in the presence of the Ag+ cation. In the crystalline phase, the 1,3,5-tris(pyrazolyl)benzene ligand 2 leads to an infinite metallatubular network in the presence of the Ag+ cation, composed of the 2,2-metallamacrocycle 4, which is formed from two molecules of 2 and two cations. This infinite network is formed by double interconnection of consecutive metallamacrocycles through binding of Ag+ centers by the free pyrazolyl moieties.
    Additional Material: 6 Ill.
    Type of Medium: Electronic Resource
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  • 9
    Electronic Resource
    Electronic Resource
    Synthesis and Structures of (N3)2Ga[(CH2)3NMe2], (N3)Ga[(CH2)3NMe2]2 and (N3)3Ga(NR3) (R = CH3, C2H5) (1999)
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 1999 (1999), S. 2127-2134 
    Details
    ISSN: 1434-1948
    Keywords: Gallium ; Azides ; Chemical vapour deposition ; Gallium nitride ; Single source precursors ; Chemistry ; General Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: The synthesis, properties and X-ray single crystal structure analysis of the intramolecularly adduct-stabilised organogallium bisazide (N3)2Ga[(CH2)3NMe2] (1), the mono azide (N3)Ga[(CH2)3NMe2]2 (2) and the trialkylamine adducts of triazidogallium of the type (N3)3Ga(NR3) (3a-d; R = alkyl) are reported. An unusual isomer 1b of compound 1 is described, which was obtained by slow cooling of the analytically pure neat liquid compound 1 to 0 °C. The new and unusual structure 1b can be regarded as a weak associate of dimers linked together by head-to-tail azide bridges. In contrast, compounds 2 and 3a-b (R = CH3, C2H5) are monomeric in the solid state. The suitability of the volatile compounds 1 and 2 as single source precursors to grow GaN thin films by chemical vapour deposition is compared, showing that preferentially oriented crystalline films can be obtained from compound 2 on sapphire substrates at 600-700 °C in vacuo (0.1 Pa). However the films have a grey rather than a transparent appearance, which is presumably due to N-deficiency owing to the lower N-content of the single molecule precursor 2 relative to 1.
    Additional Material: 5 Ill.
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  • 10
    Electronic Resource
    Electronic Resource
    The Role of N-H···Cl Hydrogen Bonds in Gold(I) Complexes with Aliphatic Amine Ligands (1999)
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 1999 (1999), S. 1103-1110 
    Details
    ISSN: 1434-1948
    Keywords: Amines ; Aurophilicity ; Gold ; Hydrogen bonds ; Chemistry ; General Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Various gold(I) complexes of aliphatic amines have been prepared by the reaction of chloro(tetrahydrothiophene)gold(I) with the respective amines. The stability of these complexes can be attributed partly to the formation of hydrogen bonds involving the N-H functions, and partly to aurophilic interactions. Analysis of these secondary contacts suggests an inverse correlation between lengths of aurophilic interactions and hydrogen bonds.
    Additional Material: 11 Ill.
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