Infrared spectra of conducting BEDSe-TTF charge-transfer salts with halide mercurate 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 anions, Hg3Br8, HgBr4, Hg2I6 and HgCl4. Additionally, infrared (IR) and Fourier transform near infrared (FT-NIR) Raman spectra of neutral BEDSe-TTF were measured. Electronic bands are analysed using a Drude–Lorentz dielectric function. Vibrational bands, mainly those related to the coupling of electrons with internal vibrations of BEDSe-TTF, are discussed. Considerable differences between IR spectra of the studied salts are mainly due to different charge of BEDSe-TTF cations.