Highly conducting perylene radical salts

Temperature dependent dc and microwave conductivity data together with EPR and optical reflectance measurements on the "mixed" system (pe)2(ASF6)0,75(PF6)0,35 times 0,85 CH2Cl2 are described. The data prove metallic behaviour of this organic solid down to 200 K

The electrical anisotropy of the organic metals (BEDT-TTF)3(ClO4)2 and α-(BEDT-TTF)3(NO3)2

We report on the polarized reflectance spectra of the two-dimensional organic metals (BEDT-TTF)3(Cl04)2 and α-(BEDT-TTF)3(N03)2 in the energy range between 0.01 and 5 eV. In contrast to the results obtained on other conducting BEDT-TTF salts, these compounds show high metallic reflectance values at room temperature down to lower energies. In particular, the Cl04-salts can be well described by a two-dimensional Lorentz-Drude model. On the basis of this model the transport parameters along the principal axes are evaluated for both compounds

Optical investigations of the electrical anisotropy of α- and β-(BEDT-TTF)2I3

The anisotropy of the electrical transport properties at room temperature of the α- and β-phase of (BEDT-TTF)2I3 was determined from the polarized reflectance spectra

Spectral reflectance of the one-dimensional organic metals (perylene)2(PF6)1.1 × 0.8CH2Cl2 and (perylene)2(AsF6)1.1 × 0.7CH2Cl2

We report on the optical reflectance of (perylene)2(PF6)1.1 × 0.8CH2Cl2 and (perylene)2(AsF6)1.1 × 0.7CH2Cl2 single crystals in the energy range from 0.25 to 4 eV. For light polarized perpendicular to the molecular stacks the crystals exhibit the optical behaviour of an insulating molecular crystals, whereas for light polarized parallel to the stacks a pronounced plasma edge at hω=0,9eV image is observed. The experimental data were analyzed by a Lorentz-Drude model in order to determine the electrical conductivity, the carrier concentration, the effective mass, the collision time, the band width, and the Fermi vector of the crystals

Comparative optical investigations on the one-dimensional organic metals (perylene)2(PF6)1.1x0.8CH2Cl2, (pyrene)12(SbF6)7 and fluoranthene)2(AsF6)0.2(PF6)0.8

The reflectance spectra of different radical cation salts of the type (arene)2XF6 are reported (X=P, As, Sb). For light polarised perpendicular to the molecular stacks, the crystals exhibit the optical behaviour of an insulating molecular crystal, whereas for light polarised parallel to the stacks a pronounced plasma edge is observed. Compared to other organic metals the crystals show remarkably high values of the plasma energy. Because the concentration of the free carriers is obtained from the charge transfer between the radical cations and the inorganic counter ions, the effective mass of the free carriers may be calculated from the plasma frequency. The analysis of the reflectance data by a Lorentz-Drude model yields as well the values of the mean collition time, the electrical conductivity, and the bandwith

Plasma reflectance of the one-dimensional organic metals of the type (arene)2XF6(arene=perylene, pyrene or fluoranthene &#59; X=P, As, Sb)

We have investigated the spectral position and the form of the plasma edge of different radical cation salts of the type (arene)zXF, independence of the type of the organic donor molecule, and of the charge transfer between donor and acceptor molecules