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Temperature dependence of the infrared and optical properties of N-dimethyl thiomorpholinium(tetracyanoquinodimethane)2.

We report the infrared and optical reflectance spectrum of semiconducting N-dimethyl thiomorpholinium (tetracyanoquinodimethane) 2 at temperatures above and below the structural phase transition. Polarized measurements were made on several faces of large single crystal samples. For polarization close to the tetracyanoquinodimethane (TCNQ) stacking axis, the spectrum resembles other many weakly conducting TCNQ salts, with strong vibrational features and two charge-transfer bands. The infrared data in this polarization were analyzed within the framework of both an isolated differ model and a twofold-commensurate charge-density-wave model