UNUSUAL CRYSTAL-STRUCTURE AND ELECTRICAL-PROPERTIES OF TETRAPHENYLPHOSPHONIUM-NI(DMIT)(2)

The structure and physical properties of TPP(tetraphenylghosphonium)(1/3)[Ni(dmit)(2)] complex were examined. The crystal has a layered structure where the conducting sheets of the dmit complex are separated by the layers of the large counter cation. Within the layer, two of the three Ni(dmit)(2) species form a dimer which stacks in [010] direction. The remaining Ni(dmit)(2) unit is disposed almost perpendicular to the stack and separates adjacent columns of Ni(dmit)(2) dimers. The crystal shows a room-temperature conductivity of ca. 10 S/cm along the long axis (column direction) and a semiconducting temperature dependence below room temperature. The in-plane anisotropy of conductivity was of the order of 1:100. The magnetic susceptibility measurement showed Curie-like behavior below room temperature.