Infrared spectra of conducting BEDSe-TTF charge-transfer salts with halidemercurate anions

We report on the studies of single crystal reflectance spectra (650-6500 cm (-1)) of four conducting radical cation salts formed by the organic donor, bis(ethylenediseleno) tetrathiafulvalene (BETSe-TTF) and mercury halide ani ons, Hg3Br8, HgBr4, Hg2I6 and HgCl4. Additionally, infrared (IR) and Fourie r transform near infrared (FT-NIR) Raman spectra of neutral BEDSe-TTF were measured. Electronic bands are analysed using a Drude-Lorentz dielectric fu nction. Vibrational bands, mainly those related to the coupling of electron s with internal vibrations of BEDSe-TTF, are discussed. Considerable differ ences between IR spectra of the studied salts are mainly due to different c harge of BEDSe-TTF cations. (C) 2000 Elsevier Science S.A, All rights reser ved.