Charge transfer bands in molecular metals and semiconductors composed of peri-condensed Weitz-type donors

Abstract

We have recently synthesized some peri-condensed Weitz-type donors as new multi-stage redox systems and realized the organic molecular metals having only organic donors and acceptors outside the TTF and TCNQ type component molecules. During this study, the V-shape correlation between hν CT and ΔE o, r proposed by Torrance et al. is found to exhibit the important validity. Thus, the correlation can be utilized not only to predict the stacking mode, the ionicity or hν CT of complexes, but also to select the potentially highly conducting complexes. Here, hν CT and ΔE o, r denote the energy of CT absorption band and the difference between the oxidation potential of donor and the reduction potential of acceptor, respectively.