Molecular Crystals and Liquid Crystals, Vol.376, 47-52, 2002
Structures and properties of radical cation salts of novel tetraselenafulvalene derivatives (BPT-TSF, EDT-PT-TSF, and BEST-TSF) with MX4(M = Fe, Ga, X = Cl, Br)-type anions
Using three different BETS variants (BPT-TSF 2, EDT-PT-TSF 3, and BEST-TSF 4), six new radical cation salts of D-2-MX4-type are prepared. The kappa-type salts with FeCl4- anion obtained from the donors 2 and 3 are isostructural with the corresponding BETS salts. From the donor 3, a radical salt with beta-type donor packing is obtained with GaCl4- anion. All these salts from donors 2 and 3 are metallic down to low temperature. On the other hand, the donor 4 possessing selenium atoms in outer heterocycles gives two lambda-type salts. They are highly conductive at room temperature, but not metallic at low temperature range.
Keywords:electron donor;electrocrystallization;radical cation salt;molecular conductor;X-ray crystallographic analysis