Thermal properties of tetrakis(alkylthio)tetrathiafulvalenes

Development of Conductive Organic Molecular Assemblies: Organic Metals, Superconductors, and Exotic Functional Materials

“…(d) Melting points of TXC n -TTF 60,63,65,69 are compared with those of alkanes and alkyl alcohols. et al, [59][60][61][62][63][64][65][66][67][68][69] and TTC n -TTP (9) and its related molecule (10) by Mori, Misaki, et al 70,71 In the case of TTC n -TTF (Table 3), the melting point (T m ) decreases appreciably from n ¼ 1 to 4, since the alkyl chains prevent the %-% intermolecular interactions between C 6 S 8 moieties with each other as shown in Fig. 7c for n ¼ 1 59 and 2.…”

“…7a and 7b for X = S, n ¼ 9) by Inokuchi, Saito, der Waals interactions between the alkyl chains (red arrows) fasten the central C 6 S 8 %-moieties of TTC 9 -TTF tightly along the direction indicated by blue arrow to enhance the molecular overlap (labeled as fastener effect). 61,62,64,66 (c) Molecular stacking of TTC 1 -TTF 59 and TTC 2 -TTF 61 molecules in solid. (d) Melting points of TXC n -TTF 60,63,65,69 are compared with those of alkanes and alkyl alcohols.…”

“…65 For TTC n -TTF compounds it has been clarified that in the small n region (n 4) intermolecular interactions of the %-moieties are dominant in the crystal, while in the large n region (n > 5) intermolecular interactions associated with alkyl chains (Fastener effect) play an important role. 66 Accordingly, it is most plausible that the self-assembling nature arising from the van der Waals interaction between alkyl chains emerges when n is around 18 for I n -3CNQ-R compounds.…”

Flexible organic field-effect transistor fabricated by thermal press process

“…The Parylene‐C layer was formed by chemical vapor deposition. Tetrakis(octadecylthio)tetrathiafulvalene (TTC 18 ‐TTF) was selected as a semiconductor layer test material, because its melting point is sufficiently low (85 °C) for the fabrication of a device on a plastic film, and it does not undergo chemical reaction at around the melting point. In addition, the melt viscosity of this material is sufficiently low for spreading in the narrow gap between the two substrates.…”

Laminated Sheet Organic Field-Effect Transistors Fabricated by Thermal Press Methods

“…Parylene-C layer was formed by chemical vapor deposition. We selected a test material of TTC 18 -TTF (Tetrakis(octadecylthio) tetrathiafulvalene) as a semiconductor layer because melting point of this material is sufficiently low (85 o C [2] ) to make a device on the plastic film, and this molecule does not undergo any chemical reaction at around melting point. In addition, viscosity of the melt of this material is sufficiently low to make thin films.…”