Two donor-acceptor type molecular conductors, α- and β-(EDT-TTF)[Ni(dmit)2] (EDT-TTF = ethylenedithiotetrathiafulvalene, dmit = 4,5-dimercapto-1,3-dithiole-2-thione) have been electrochemically obtained. The α-form has a segregated column structure and is a metal with an anomalous resistivity maximum around 14 K. The curve-fitting analysis of the polarized reflectance spectra shows a small anisotropy of the oscillator strength in the ab plane. The β-form is a semiconductor with a mixed-stacking structure.
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Kato et al. (1989) studied this question.