A novel phase transition in conductive molecular crystals based on metal bis-diselenoalkene complexes: [TMTSF]2[M{Se2C2(CF3)2]; M = Ni, Pt; TMTSF = tetramethyltetraselenafulvalene
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Single crystals of [TMTSF]2[M(Se2C2(CF3)2)2](TMTSF = tetramethyltetraselenafulvalene; M = Ni, Pt) have room-temperature conductivities of 2065 ;1 cm1 and upon cooling undergo an unprecedented phase transition in which the low temperature phase shows enhanced electrical conductivity: M = Ni, Tc=ca. 275 K; M = Pt, Tc=ca. 245 K. Royal Society of Chemistry.