STATIC POLYCRYSTALLINE MAGNETIC-SUSCEPTIBILITY AND 4-PROBE SINGLE-CRYSTAL CONDUCTIVITY STUDIES OF [RU(BPY)(3)](0)

Magnetic susceptibility measurements of polycrystalline samples of ele ctrochemically grown [Ru(bpy)(3)](0) show a low-temperature sub-Curie law tail and a broad maximum at about 300 K. The data are consistent w ith an alternating linear-chain spin-1/2 Heisenberg antiferromagnetic system, with \J\/k = 238(3) K, the alternation parameter alpha = 0.40( 3), and g = 2.20(4). The stronger coupling is probably intermolecular between ligand-localized electrons on adjacent molecules with signific ant pi overlap. Four-probe single-crystal conductivities of needle-sh aped crystals show the material to be moderately conducting (sigma app roximate to 1.5 x 10(-1) Omega(-1) cm(-1) at 297 K) along the long axi s. Fittings of the temperature dependence of the conductivity suggest that variable-range three-dimensional hopping is responsible for the o bserved conductivity.