Structural and Physical Properties of New Conducting Cation Radical Salts with Te-Based Counteranions, Tetraiodotellurate(II) and Hexaiododitellurate(II) |
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Authors: | Masahiro FujiwaraNaoya Tajima Tatsuro ImakuboMasafumi Tamura Reizo Kato |
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Affiliation: | a The Institute for Solid State Physics, The University of Tokyo, 5-1-5 Kashiwanoha, Kashiwa-shi, Chiba, 277-8581, Japanb RIKEN (The Institute of Physical and Chemical Research), Hirosawa, 2-1 Wako-shi, Saitama, 351-0198, Japan |
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Abstract: | This article reports preparation, structure, and conducting property of several cation radical salts of organic donors tetramethyltetrathiafulvalene (TMTTF), ethylenedithiotetrathiafulvalene (EDT-TTF), bis(ethylenedithio)tetrathiafulvalene (ET), bis(ethylenedithio)tetraselenafulvalene (BETS) and hexamethylenetetraselenafulvalene (HMTSF) with two novel planar Te-based dianions, TeI42− and Te2I62−. (ET)5Te2I6 1 and (BETS)5Te2I6 2 are isostructural. In these Te2I62− salts, intermolecular short I···I contacts form a supramolecular corrugated anion sheet. Donor arrangement is similar to the θ-type. With lowering temperature, the resistivity of 1 shows a gradual increase followed by a sharp upturn at 110 K. 2 is metallic down to 120 K and shows a gradual increase of the resistivity followed by a clear transition to an insulating state around 60 K. Crystal structure of (ET)4TeI4 3 is based on the “herring bone” arrangement of ET molecules similar to the α-type. 3 shows a semiconductive behavior around room temperature followed by a transition to an insulating state at 210 K. (EDT-TTF)4TeI4 4, a semiconductor, exhibits a unique two-dimensional arrangement of dimerized EDT-TTF molecules. |
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Keywords: | molecular conductor TTF derivatives tellurium-halide anion crystal structure band structure electric resistivity. |
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