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The mixed-valence Cu salt of DMe-DCNQI provides unique physical properties due to the interaction between the one-dimensional (1D) organic pπ band and the d-orbital of Cu ion. This system is metallic down to very low temperature at ambient pressure in spite of the 1D column structure, whereas the system exhibits a sharp metal-insulator (M-I) transition accompanied by a threefold superstructure under pressure. Reentrant behavior (M-I-M transition) is observed in the boundary pressure region. The selective dueteration of (DMe-DCNQI) 2Cu has enabled to control the chemical pressure. Application of this technique produces the Petf-T phase diagram of this system under ambient pressure. The effect of (chemical) pressure on these transitions in the system is generally understood from the change in charge transfer amount from metal ions to DCNQI molecules by low temperature crystal structure analysis and a doping method.

Physical Properties and Crystal Structure at Low Temperature of the Molecular Conductor (DMe-DCNQI)2Cu System.