Structures and Physical Properties of Highly Conducting Single-Component Molecular Conductors Containing Se Atoms

Single-component molecular conductors [M(tmstfdt)2] (M = Ni, Au; tmstfdt = trimethylenediselenadithiafulvalenedithiolate) substituted with Se atoms are prepared and found to be isostructural with [M(tmdt)2] (M = Ni, Au; tmdt = trimethylenetetrathiafulvalenedithiolate). Measurements of the electrical conductivity and magnetic susceptibility of [Ni(tmstfdt)2] show that it has essentially metallic properties down to low temperatures. The resistivity measurements of [Au(tmstfdt)2] suggest it undergoes a metal-insulator phase transition at around 100 K. Magnetic susceptibility and ESR measurements of [Au(tmstfdt)2] indicate that it undergoes a magnetic transition at around 5 K, which is much lower than theantiferromagnetic (AF) phase-transition temperature of [Au(tmdt)2] (110 K). (© Wiley-VCH Verlag GmbH & Co. KGaA, 69451 Weinheim, Germany, 2009)

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