Hydrogen-Bonded Charge-Transfer Complexes of TTF Containing a Uracil Moiety: Crystal Structures and Electronic Properties of the Hydrogen Cyananilate and TCNQ Complexes

A novel TTF-based donor with a uracil moiety, TTF-(1-n-butyluracil-5-yl) (TnbU), was synthesized. Crystal structures of both TnbU and the charge-transfer complex of TnbU−hydrogen cyananilate possess complementary double hydrogen bonds through uracil moieties and π-stacking dimer structures between TTF skeletons. Furthermore, the TnbU−TCNQ charge-transfer complex shows a high electrical conductivity underlying the partial charge-transfer accompanied by a hydrogen-bonding interaction, which was substantiated in terms of the measurements of the IR, electronic spectra, and conductivity.