Synthesis and electrical conductivity of perchlorate-doped TTF–diamide nanofibers with double and triple helix structures

Abstract

We synthesized 4,5-bis(octadecylthio)-4 0 ,5 0 -bis(ethylcarbamoyl)tetrathiafulvalene and measured the electrical conductivity of its perchlorate (ClO 4 À )-doped nanofibers, which have double and triple helix structures. The nanostructure of the bis(octadecylthio)-TTF-diamide and its ClO 4 À -doped fibers in a 3 : 1 ratio was deduced in relation to the X-ray crystal structure of bis(methylthio)-TTF-diamide. The doubly coiled nanofibers form when initially formed spiral ribbons of lamellarly arranged TTFdiamide perchlorate split in the middle, and a further split of the double helix produces the triplex structure. Temperature-dependent conductance and current-voltage (I-V) characteristics of the coiled fibers were measured in the temperature (T) range of 70-300 K. The conductance decreased with a decrease in T, and the I-V characteristics were nonlinear over the entire T range. The results were analyzed by using a modified fluctuation-induced tunneling conduction model, where the barrier height and width were linearly dependent on the electric field.

Supramolecular self-assemblies as functional nanomaterials

“…5b). 218 A room temperature conductivity of 4.59 Â 10 À3 S m À1 was obtained with these nanostrutures.…”

Synthesis, Characterization, and Self-Assembly of a Tetrathiafulvalene (TTF)–Triglycyl Derivative

“…In general, the rational design behind these examples involves the connection of the TTF unit with groups capable of H-bonding, such as urea [57] or amide groups [58][59][60][61][62][63], to form extended structures. The incorporation of other molecular building blocks commonly used to form physical gels [64][65][66][67] or the use of metal-organic interactions [68][69][70] have also been employed to form TTF-based gels. Moreover, the inclusion of hydrophobic aliphatic chains is also employed to facilitate van der Waals interactions and stabilize the supramolecular aggregates [58][59][60][61][62][63][64][65][66][67][68][69][70][71].…”

“…The incorporation of other molecular building blocks commonly used to form physical gels [64][65][66][67] or the use of metal-organic interactions [68][69][70] have also been employed to form TTF-based gels. Moreover, the inclusion of hydrophobic aliphatic chains is also employed to facilitate van der Waals interactions and stabilize the supramolecular aggregates [58][59][60][61][62][63][64][65][66][67][68][69][70][71]. If formation of CT complexes takes place, the TTF unit will bear positive charge, which can alter the interaction of neighboring TTF units and influence the intermolecular interactions arising from other groups involved in the self-assembly process.…”

Selbstorganisierte Gelbildner für die organische Elektronik

“…[71][72][73][74][75][76][77][78][79][80] Ein Beispiel ist das von Amabilino et al entwickelte Amid-funktionalisierte TTF-Derivat 30 (Schema 7), das interessante elektronische Eigenschaften aufweist. [71][72][73][74][75][76][77][78][79][80] Ein Beispiel ist das von Amabilino et al entwickelte Amid-funktionalisierte TTF-Derivat 30 (Schema 7), das interessante elektronische Eigenschaften aufweist.…”

“…In den letzten Jahren wurde eine Bandbreite von leitfähigen TTF-Gelen mit exzellenten Redoxeigenschaften beschrieben. [71][72][73][74][75][76][77][78][79][80] Ein Beispiel ist das von Amabilino et al entwickelte Amid-funktionalisierte TTF-Derivat 30 (Schema 7), das interessante elektronische Eigenschaften aufweist. [71] Widerstandsmessungen des dotierten Xerogels von 30 ergaben eine Leitfähigkeit von s = 3-5 10 À3 W À1 cm À1 .…”