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Issue 31, 2005
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Multistability in a family of DT–TTF organic radical based compounds (DT–TTF)4[M(L)2]3 (M = Au, Cu; L = pds, pdt, bdt)

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Abstract

The preparation of new charge transfer salts based on the DT–TTF donor and monoanionic square planar transition metal bisdichalcogenide complexes M(L)2 (M = Au, Cu; L = pds, pdt, bdt, where pds = pyrazine-1,2-diselenolate, pdt = pyrazine-1,2-dithiolate, bdt = benzene-1,2-dithiolate) are reported and these salts are characterized by X-ray diffraction, EPR spectroscopy, electrical conductivity, thermoelectric power and static magnetization measurements, as well as tight-binding band structure calculations. Three compounds, (DT–TTF)4[AuIII(bdt)2]3, (DT–TTF)4[CuIII(pds)2]3, (DT–TTF)4[CuIII(pdt)2]3, are members of a general family of compounds of DT–TTF with stoichiometry 4 : 3 as the previously reported (DT–TTF)4[AuIII(pds)2]3. Although not strictly isostructural, all members of this family present a similar crystal packing motif of the donor and acceptor units and present a common pattern of first- and second-order phase transitions as seen in electrical transport and magnetic properties. The second-order phase transition is ascribed to a variation from dynamic to static charge ordering. With [CuIII(pdt)2] and DT–TTF a 1 : 1 salt with formula (DT–TTF)[CuIII(pdt)2] was also obtained. The structural differences and similarities between the four compounds (DT–TTF)4[M(L)2]3 (M = Au, Cu; L = pds, pdt, bdt), that are related to their physical properties, and the reversible phase transitions observed are discussed.

Graphical abstract: Multistability in a family of DT–TTF organic radical based compounds (DT–TTF)4[M(L)2]3 (M = Au, Cu; L = pds, pdt, bdt)

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Publication details

The article was received on 25 Apr 2005, accepted on 03 Jun 2005 and first published on 27 Jun 2005


Article type: Paper
DOI: 10.1039/B505724H
Citation: J. Mater. Chem., 2005,15, 3187-3199
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    Multistability in a family of DT–TTF organic radical based compounds (DT–TTF)4[M(L)2]3 (M = Au, Cu; L = pds, pdt, bdt)

    J. C. Dias, X. Ribas, J. Morgado, J. Seiça, E. B. Lopes, I. C. Santos, R. T. Henriques, M. Almeida, K. Wurst, P. Foury-Leylekian, E. Canadell, J. Vidal-Gancedo, J. Veciana and C. Rovira, J. Mater. Chem., 2005, 15, 3187
    DOI: 10.1039/B505724H

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