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Structural and Electrical Properties of the τ-(P-S,S-DMEDT-TTF)2 (AuCl2) (AuCl2)y Compound with (y ≈ 0.9)
Institute of Advanced Materials, Physicochemical Processes, Nanotechnology and Microsystems, Department of Materials Science, National Centre for Scientific Research (NCSR) “Demokritos”, Aghia Paraskevi Attikis 153 10, Greece
Theoretical and Physical Chemistry Institute, National Hellenic Research Foundation, Athens 11635, Greece
Department of Physics, Graduate School of Science, Osaka City University, Sumiyoshi-ku, Osaka 558-8585, Japan
* Author to whom correspondence should be addressed.
Received: 24 May 2012; in revised form: 6 July 2012 / Accepted: 16 August 2012 / Published: 3 September 2012
Abstract: The compound τ-(P-S,S-DMEDT-TTF)2(AuCl2) (AuCl2)y (where P-S,S-DMEDT-TTF is the compound pyrazino-(S,S)-dimethyl-ethylenedithio-tetrathiofulvale) crystallizes in the non-centrosymmetric space group I-42d, with a = 7.3260(1) Å and c = 67.5487(12) Å (RT data) and remains tetragonal in the temperature range from RT to 100 K. This compound is a quasi-two-dimensional material and the relation of the lattice of the order part of the structure created by the donor molecules with that of the disordered anion lattice revealed by intense diffusion streaks give a value of y ≈ 0.9. In contrast to the Br and I analogs or the related compounds which contain the compound ethylenedioxy-S,S-dimethylenedithiotetrathiafulvalene (abbreviated as EDO-S,S-DMEDT-TTF) as donor and which exhibit anisotropic metallic behavior down to low temperature, this compound is anisotropic semiconductor in the same temperature range. The appearance of satellites on the diffraction images recorded below 110 K indicates a structural change. Resistivity measurements show that this material is a semiconductor with anisotropy σa/σc of ca. 400–1400 at room temperature.
Keywords: organic semiconductor; quasi-two-dimensional; crystal structure; diffusion intensity; low temperature diffraction
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Psycharis, V.; Mousdis, G.A.; Murata, K.; Papavassiliou, G.C. Structural and Electrical Properties of the τ-(P-S,S-DMEDT-TTF)2 (AuCl2) (AuCl2)y Compound with (y ≈ 0.9). Crystals 2012, 2, 1283-1290.
Psycharis V, Mousdis GA, Murata K, Papavassiliou GC. Structural and Electrical Properties of the τ-(P-S,S-DMEDT-TTF)2 (AuCl2) (AuCl2)y Compound with (y ≈ 0.9). Crystals. 2012; 2(3):1283-1290.
Psycharis, Vassilis; Mousdis, George A.; Murata, Keizo; Papavassiliou, George C. 2012. "Structural and Electrical Properties of the τ-(P-S,S-DMEDT-TTF)2 (AuCl2) (AuCl2)y Compound with (y ≈ 0.9)." Crystals 2, no. 3: 1283-1290.