Synthesis, structure, and electroconductivity of new radical cation salt [Pd(dddt)(2)](2)GaBr4

A new radical cation salt based on the dithiolate complex Pd(dddt)(2) (dddt = 5,6-dihydro-1,4-dithiine-2,3-dithiolate) with the tetrahedral anion [GaB r4](-) was synthesized. The crystal and molecular structure was determined by XRD analysis. The crystal structure of the salt contains Pd(dddt)2 catio n layers alternating with layers of [GaBr4](-) anions along the c axis of t he unit cell. The cation layers contain stacks of Pd(dddt)(2), with a Pd... Pd distance of 3.011 Angstrom. The electroconductivity of [Pd(dddt)(2)](2)G aBr4 single crystals at room temperature is 0.25 Ohm(-1) cm(-1) and decreas es with temperature decrease, the activation energy being E-a = 0.66 eV.