Electrical oxidation of bis(ethylenedithiolo)tetrathiofulvalene (BEDT-TTF) 1 in a nitrogen saturated tetrahydrofurane solution containing (n-C4HIO)4N+I:i' as electrolyte results in the deposition of crystal plates of (BEpT-TTF)rI3' (CIOHgSshI3' These two dimensional crystals are triclinic, space group PI, a = 9.211(2), b = 1O.S50 ( 4) behave like a two dimensional metal. while below 135 K a metal-insolator transition occurs. The thermopower values indicate that the high temperature conductivity is dominated by holes. An estimate of the Fermi energy (F gives a value of (F '" 0.3 eV.

Temperature -dependent thermopower-, dc-and microwave conductivity m~asurements on the two-dimensional organic metal (BEDT -TTF)2J; are reported.

No abstract

No abstract

The dc-conductivity and thermoelectric pover of electrochemically prepared polypyrroles have been investigated in the temperature range between 300 K and 1.3 K on unaged. aged ( 2~-120 days at 80 0 c in air) and chemically modified samples. The linear temperature dependence of the thermopower of unaged polypyrroles demonstrates clearly the contribution of metallic regions to the electronic transport properties. The temperature dependence of the conductivity ot the polypyrroles investigated corresponds to that predicted by the variable range hopping model.