Physics Journal of the Indonesian Physical Society
OPTICAL STUDY ON THE ELECTRONIC STATES IN (NME4)2TCNQ3
Hasanudin1, N. Kuroda2 and T. Sugimoto3
1Fakultas Teknik, Universitas Tanjungpura, Pontianak 78124, Indonesia
2Department of Mechanical Engineering and Materials Science, Faculty of Engineering, Kumamoto University, Kumamoto 860-0855, Japan
3Research Institute for Advanced Science and Technology, Osaka Prefecture University, Sakai 599-8570, Japan
Temperature dependence of linearly polarized optical absorption have been measured on the single crystals of (NMe4)2TCNQ3 in the spectral range from mid-infrared to visible. A strongly temperature-dependent inter-radical charge transfer band is observed in addition to the well-known bands of the TCNQ complexes. The properties of this band reflect the structural phase transition in this crystal. In the infrared region the vibration modes appear in neutral and anionic species provides the uneven distribution of the electrons along the TCNQ stack. The existence of the originally infrared-inactive ag modes indicates the dimerized nature of the TCNQ- molecules and strong coupling between the radical-radical charge transfer and the molecular vibration.