High pressure investigations on TTF-TCNQ charge-transfer complexes.

Charge-transfer complexes (CTC) exhibit promising application in scientific field. A prototype CTC (TTF-TCNQ), formed by charge donating (tetrathiafulvalene) and charge accepting (tetracyanoquinodimethane) molecule, was systematically studied by Raman method. By combining Raman and synchrony X-ray diffraction (XRD), we investigated the high-pressure structures of TTF-TCNQ up to 15 GPa, and did not observe any first-order phase transition. Finally, a detailed evolution of structure for TTF-TCNQ, versus pressure, is provided, offering a new pathway to investigate the structural stability of CTC.