Browsing by Author "Dietz, Klaus"

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    α- and β-(BEDT-TTF)2+I3-: two dimensional organic metals
    (1985) Hennig, Ingolf; Bender, Klaus; Schweitzer, Dieter; Dietz, Klaus; Endres, Helmut; Keller, Heimo J.; Gleitz, Arno; Helberg, Hans W.
    Electronic properties of α- and β-(BEDT-TTF)2I3 crystals are reported.
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    (BEDT-TTF)2+J3- : a two-dimensional organic metal
    (1984) Bender, Klaus; Dietz, Klaus; Endres, Helmut; Helberg, Hans W.; Hennig, Ingolf; Keller, Heimo J.; Schäfer, Herbert; Schweitzer, Dieter
    Temperature-dependent thermopower-, dc- and microwave-conductivity measurements on the two-dimensional organic metal (BEDT-TTF)2+J3- are reported.
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    Doped dialkylated phenazines : a novel series of highly conducting organic solids
    (1981) Dietz, Klaus; Flandrois, Serge; Keller, Heimo J.; Koch, P.; Queckbörner, Jobst G.; Schweitzer, Dieter
    Doping dimethylphenazine (M2P)-TCNQ and diethylphenazine (E2P)-TCNQ with phenazine gave rise to new conducting compounds with segregated stacks : (M2P)0.5 (P)0,5 TCNQ and (E2P)0,55 (P)0,45 TCNQ. The room temperature electrical conductivities are in the range 10-100 Ω-1 cm-1 for (1) and 1-10 Ω-1cm-1 for (2). The paramagnetism of both compounds could be separated into contributions from TCNQ and Phenazine stacks. The structural electrical and magnetic similarities of (1) with the well-known N-methylphenazinium (NMP)-TCNQ led to a reexamination of its magnetic properties. It was shown that an estimate of the charge transfer can be obtained from the temperature dependence of the magnetic susceptibility.
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    Optical investigations of the electrical anisotropy of α- and β-(BEDT-TTF)2I3
    (1985) Koch, Bertram; Geserich, Hans Peter; Ruppel, Wolfgang; Schweitzer, Dieter; Dietz, Klaus; Keller, Heimo J.
    The anisotropy of the electrical transport properties at room temperature of the α- and β-phase of (BEDT-TTF)2I3 was determined from the polarized reflectance spectra.
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    Synthesis, structure and physical properties of a two-dimensional organic metal, di[bis(ethylenedithiolo)tetrathiofulvalene] triiodide, (BEDT-TTF)2+I3-
    (1984) Bender, Klaus; Hennig, Ingolf; Schweitzer, Dieter; Dietz, Klaus; Endres, Helmut; Keller, Heimo J.
    Electrical oxidation of bis(ethylenedithiolo)tetrathiofulvalene (BEDT-TTF) 1 in a nitrogen saturated tetrahydrofurane solution containing (n-C4H10)4N+I3 as electrolyte results in the deposition of crystal plates of (BEDT-TTF)+2I3 (C10H8S8)2I3. These two dimensional crystals are triclinic, space group P1, a = 9.211(2), b=10.850(4), c = 17.488(5) Aring, agr=96.95(2), β = 97.97(2), γ = 90.75(2)°, V = 1717 Aring3, Mr = 1150.01, Z=2, Dx =2.22 g cm-3. Rw = 0.037 for 2462 observed reflections. Sheets of alternating cations and anions occur in the compound. The most prominent intermolecular S-S contacts (∼3.5Aring) are found between the stacks of BEDT-TTF. The stacking of the molecules and the interstack contacts give the compound a two-dimensional character which influences the physical properties.