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  • Chemistry  (2)
  • 71.25  (1)
  • 1990-1994  (3)
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  • 1
    Electronic Resource
    Electronic Resource
    Characterisation of the Fermi surface and phase transitions of (BEDO-TTF)2 ReO4·(H2O) by physical property measurements and electronic band structure calculations (1994)
    Springer
    The European physical journal 94 (1994), S. 39-47 
    Details
    ISSN: 1434-6036
    Keywords: 71.25 ; 74.70.K
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The electronic properties of the organic superconductor (BEDO-TTF)2 ReO4·(H2O) were investigated by temperature dependent resistivity, ESR, Hall effect and magnetoresistance measurements. Shubnikov-de Haas (SdH) oscillations were observed in magnetic fields up to 24 T in the temperature range 0.5 K to 4.2 K. The electronic band structure of (BEDO-TTF)2 ReO4·(H2O) was calculated by employing the extended Hückel tight binding method on the basis of its room temperature crystal structure. The two observed SdH frequencies of 75 T and 37 T correspond very well with two cross-sectional areas of the hole and electron Fermi surface pockets obtained from the tight binding calculation. From the temperature dependence of the SdH oscillation amplitudes, the cyclotron effective mass (mc) belonging to the larger and smaller pockets were found to be 0.9 m0 and mc=1.15 m0 respectively. Measurements of the angular dependence of the SdH frequencies show no deviation from that expected for a cylindrical Fermi surface. In terms of our tight binding calculations and experimental measurements, probable causes for the 213 K and ∼35 K phase transitions are discussed. The calculations show that (BEDO-TTF)2 ReO4·(H2O) is a two dimensional semimetal but possesses a hidden nesting. The latter is likely to cause an SDW instability leading to the ∼35 K transition. The resistivity drop associated with the 213 K transition is likely to be induced by an abrupt increase in the relaxation time. The excellent agreement between the calculated and experimentally observed Fermi surface implies that, with decreasing temperature below 35 K, (BEDO-TTF)2 ReO4·(H2O) gradually gets out of the SDW state and re-enters the “original” metallic state, in which it becomes superconducting below 2.4 K.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01307652
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  • 2
    Electronic Resource
    Electronic Resource
    Der erste einkernige Nitrosyl(oxo)molybdän-Komplex: side-on-gebundene und μ3-verbrückende NO-Liganden in [{MoL(NO)(O)(OH)}2]NaPF6·H2ODiese Arbeit wurde vom Fonds der Chemischen Industrie gefördert. (1994)
    Weinheim : Wiley-Blackwell
    Zeitschrift für die chemische Industrie 106 (1994), S. 1556-1559 
    Details
    ISSN: 0044-8249
    Keywords: Chemistry ; General Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Additional Material: 5 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/ange.19941061422
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  • 3
    Electronic Resource
    Electronic Resource
    Zur Koordinationschemie von cis-Trioxowolfram(VI)-Komplexen. Die Kristallstrukturen von LWO3 · 3 H2O, [L′WO2(OH)]Br, [LWO2Br]Br, [L2W2O5](S2O6) · 4 H2O und [LWO2(μ-O)WO(O2)2(OH2)] (L = 1,4,7-Triazacyclononan; L′ = 1,4,7-Trimethyl-1,4,7-triazacyclononan) (1990)
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 587 (1990), S. 174-192 
    Details
    ISSN: 0044-2313
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Coordination-chemistry of cis-Trioxotungsten(VI) Complexes. Crystal Structures of LWO3 · 3 H2O, [L′WO2(OH)]Br, [LWO2Br]Br, [L2W2O5](S2O6) · 4 H2O and [LWO2(μ-O)WO(O2)2(OH2)] (L = 1,4,7-Triazacyclonane; L′ = 1,4,7-Trimethyl-1,4,7-triazacyclononane)The cyclic triamines 1,4,7-triazacyclononane (L; C6H15N3) and 1,4,7-trimethyl-1,4,7-triazacyclononane (L′; C9H21N3) react in aqueous solution with WO3 affording LWO3 · 3 H2O, 1, and L′WO3 · 3 H2O, respectively, which yield [L′WO2(OH)]Br, 2, and [LWO2Br]Br, 3, in concentrated HBr solutions. In aqueous CH3SO3H solution 1 dimerizes. The iodide and dithionate 4 salts of [L2W2O5]2+ have been isolated. In 35% H2O2 complex 1 yields the neutral species [LWO2(μ-O)WO(O2)2(H2O)] 5. The crystal structures of 1-5 have been determined by X-ray analysis. Crystal data: 1: P21/c; a = 7.729(2), b = 14.887(3), c = 10.774(2) Å, β = 90.77(2)°, Z = 4; 2: Cc; 8.910(3), b = 12.220(6), c = 13.279(6) Å, β = 101.31(3)°, Z = 4; 3: Cmc21, a = 8.857(5), b = 12.062(7), c = 11.218(7) Å, Z = 4; 4: Cc, a = 17.601(7), b = 12.906(7), c = 14.107(8) Å, β = 124.08(4)°, Z = 4; 5: P212121; a = 8.452(4), b = 11.301(6), c = 13.750(6) Å, Z = 4.
    Notes: Die cyclischen Triamine 1,4,7-Triazacyclononan (L; C6H15N3) und 1,4,7-Trimethyl-1,4,7-triazacyclononan (L′; C9H21N3) reagieren in wäßriger Lösung mit WO3 zu LWO3 · 3 H2O, 1, bzw. L′WO3 · 3 H2O, deren Umsetzung mit HBr zu [L′WO2(OH)]Br, 2, bzw. [LWO2(Br)]Br, 3, führt. In wäßriger CH3SO3H-Lösung dimerisiert 1 zu [L2W2O5]2+, das als Iodidoder Dithionatsalz, 4, kristallin erhalten wurde. Mit 35% H2O2 reagiert 1 unter Bildung des zweikernigen Neutralkomplexes [LWO2(μ-O)WO(O2)2(H2O)], 5. Die Kristallstrukturen von 1-5 wurden bestimmt. Kristalldaten 1: P21/c; a = 7,729(2), b = 14,887(3), c = 10,774(2) Å, β = 90,77(2)°, Z = 4; 2: Cc; 8,910(3), b = 12,220(6), c = 13,279(6) Å, β = 101,31(3)°, Z = 4; 3: Cmc21, a = 8,857(5), b = 12,062(7), c = 11,218(7) Å, Z = 4; 4: Cc, a = 17,601(7), b = 12,906(7), c = 14,107(8) Å, β = 124,08(4)°, Z = 4; 5: P212121; a = 8,452(4), b = 11,301(6), c = 13,750(6) Å, Z = 4.
    Additional Material: 5 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/zaac.19905870119
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