Preparation, crystal structure and electrical conductivity of [EDA][Ni(dmit)2]3 (dmit=1,3-dithiole-2-thione-4,5-dithiolate)

The synthesis, conductivity behavior and crystal structure of the ion radical salt [EDA][Ni(dmit)2]3 (EDA=2-diethylamino-1,3-dithiolanylium; dmit=1,3-dithiole-2-thione-4,5-dithiolate) are described. The crystal possesses the triclinic system. The structure consists of thick layers of stacked Ni(dmit)2 entities separated by EDA cations. Short S⋯S interstack distances are observed such that two-dimensional networks of closely spaced Ni(dmit)2 are formed and reflected in low anisotropy in conductivities measured in the ab plane (σa:σb: σc=1:2:10−4). The room-temperature four-probe conductivity measured along the longest axis (b axis) is about 0.2 S cm−1. Temperature dependence shows a thermally activated conductivity with activation energy of 0.11 eV.