The properties of tetraphenyldithiapyranylidene triiodides: Two new organic conductors

The structures of two forms of tetraphenyldithiapyranylidene polyiodide, one-dimensional organic conductors

“…This is consistent with scattering by a static charge density wave, a modulation on the ~04DTP stack caused by the interaction of the incommensurate 13 chains with the conduction electrons on the ~04DTP stack. From charge-neutrality considerations (Isett et al, 1979b) the Fermi wave vector, 2k r, for this modulation is 2k F = 27rfo/2c = 2rc/c' = 27r/9.7, where fj~ is the fractional charge per donor which is 0.77 for a fully incommensurate triiodide component. It is possible that the modulation and the charge density wave could be associated with the commensurate 13 chains.…”

“…The crystal structure (Smith & Luss, 1977) showed that this material fits the criteria described above for an efficient organic conductor. Subsequently, two crystal forms of the ion-radical salt of ~04DTP and iodine were prepared and studied by Isett, Reynolds, Schneider & Perlstein (1979b). One form (DTPI1) is orthorhombic with a single-crystal conductivity of 200 ~-1 m-~ at room temperature.…”