Naraso Borjigin - Synthetic Metals

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  Publication Details (including relevant citation   information):

  2010,160,   21

  Naraso Borjigin, Jun-ichi   Nishida, Shizuo Tokito, Luke Theogarajan and Yoshiro   Yamashita


  synthetic metals2 a.jpg

  Scheme 1. Synthesis of TTF   derivatives.


  synthetic metals2 b.jpg

  Fig. 1. UV–vis spectra of TTF   derivatives DQ-TTF, 1 and 2 in   CH2Cl2.

  synthetic metals2 c.jpg

  Fig. 2. π-Stacking and molecular   arrangement, (a) for 1, (b) for   2 and (c) for 3.

  Three new quinoxalinoTTF derivatives with methyl, trifluoromethyl   and fluoro groups were synthesized and characterized by UV–vis   absorption spectroscopy, differential scanning calorimetry, X-ray   single crystal analysis, X-ray diffraction, and field-effect   transistor (FET) characteristics. All of them have π-stacking   structures in the single crystals. The quinoxalinoTTF derivative   with trifluoromethyl groups exhibited an n-type FET, which is a   rare example of n-channel FETs based on TTF derivatives. The   highest electron mobility is 0.01 cm2 V−1  s. The FET polarity was converted to p-channel from n-channel by   replacing the trifluoromethyl groups with methyl groups. The hole   mobility is as high as 0.2 cm2 V−1 s. In   contrast, the fluoro substituted derivative did not show FET   properties due to the poorly ordered molecular arrangement.

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