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θ-(BDT-TTP) 2 Cu(NCS) 2 (BDT-TTP=2,5-bis(1,3-dithiol-2-ylidene)-1,3,4,6-tetrathia-pentalene) is a highly correlated organic conductor with a quasi-two-dimensional electronic structure. This compound undergoes a second-order phase transition at 250 K. Below the phase transition temperature, the optical gap significantly broadens. From the analysis of the Raman spectrum, we found that the phase transition was accompanied by a disproportionation of charge. The separated charge forms a vertical stripe along the b-axis, and the b-axis is likely to be doubled at 5 K.

We have obtained a new molecular metal containing a rare-earth complex anion, g "-(BO) 2 [YbCl 4 (H 2 O) 2 ]. This salt retains metallic conductivity down to 4 K. This crystal is metastable at room temperature; it gradually tranforms into another phase, f -(BO) 2 [YbCl 4 (H 2 O) x ], which becomes insulating below 210 K. The g "-phase crystal have a chain structure of the anions, formed by OH···Cl hydrogen bonding. This is the first example of a ~ molecular conductor based on an assembled rare-earth complex. Preparation, structure and resistivity of (BO) 2 [YbCl 4 (H 2 O) x ] system is reported. Rare-earth molecular conductors structure f -electrons