Synthesis and Properties of TTF Oligomers Possessing Electron-Withdrawing Groups in the Spacer

Dimeric and trimeric tetrathiafulvalene (TTF) derivatives possessing carbonyl groups in the spacer (1, 2) and dimeric TTF derivatives and tetrathiapentalene (TTP) derivatives possessing ester groups in the spacer (3, 4) have been synthesized. Cyclic voltammogram of 1–3 exhibits two pairs of redox waves. No significant shift of redox potentials was observed as increase of the TTF units. Cyclic voltammogram of 4 shows four pairs of two-electron redox waves. The E 1 / 2 2 − E 1 / 2 1 value of 4 is larger than that of the corresponding monomer and the first redox wave is slightly broad, suggesting small intramolecular interaction between two TTP units in the oxidation states.