Interaction and aggregation of TTF oligomers towards supramolecular chemistry

Dimeric and oligomeric TTFs have an inherent multi-functionality. Thus, radical salts derived from bi-TTF and its derivatives show high conductivities, reflecting either the enhancement of dimensionality or the control of stoichiometry. In the case of TTF oligomers, supramolecular structures can be constructed using association of TTFs. Thus, quarter-TTF adopts a zigzag structure, and its tetracation forms a helical structure through the intramolecular $\pi$-dimer formation of the terminal radical cations. Poly(tetrathiafulvalenylethynyl)benzenes dimerize in solutions, and tetrathiafulvalenylacetylene macrocycles containing TTF and hexadehydro[12]annulene units show interesting properties such as solvatochromism, electrochromism, sandwitch complex formation, and electrical conductivities. Key words. TTF dimers – TTF oligomers – quarter TTF – dimensionality – supramolecular structure – poly(tetrathiafulvalenylethynyl)benzenes – tetrathiafulvalenylacetylene macrocycles