Superconductivity in an organic solid. Synthesis, structure, and conductivity of bis(tetramethyltetraselenafulvalenium) perchlorate, (TMTSF)2ClO4

Tetrathiapentalene-based organic conductors

“…Yakushi and co-workers reported that this salt shows a phase transition accompanied with a change in the activation energy at 250 K, below which the donors are in a charge-ordering state as is often observed in θ-phase conductors [75]. Kobayashi and co-workers reported that (BDT-TTP) 3 I has a unique 3D donor packing with six crystallographically independent donor molecules, as shown in figure 5 [50]. This salt shows semiconducting behavior with a small activation energy of 0.014 eV due to charge disproportionation.…”

“…Since the publication of the report on the metallic conductivity in a tetrathiafulvalene-tetracyanoquinodimethane (TTF · TCNQ) complex [1] and the subsequent discovery of the first organic superconductor (TMTSF) 2 PF 6 (TMTSF = tetramethyltetraselenafulvalene) [2], TTF and its derivatives have played a leading role in the development of new molecular metals and superconductors [3][4][5]. To explore molecular organic superconductors, it is important to stabilize the metallic state down to low temperatures ( 4.2 K) by enhancing the dimensionality of electrical conductivity.…”

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

“…3.3.1 Heavy Atom Substitution: Self-Assembling Ability of TMTSF Molecules, SeÁÁÁSe Atomic Contacts, and 1D Superconductors: The most successful molecule by ''heavy atom substitution'' is the TMTSF molecule, which has provided eight organic superconductors with inorganic counter anions X; (TMTSF) 2 X mainly was developed by Bechgaard et al (Table 13). [162][163][164][319][320][321][322][323][324][325][326][327][328] Among them, the superconducting NbF 6 salt was recently obtained by electrocrystallization with RT ionic liquid EMI Á NbF 6 (EMI: 1-ethyl-3-methylimidazolium) as an electrolyte by us. 328 It has been reported that (TMTSF) 2 NbF 6 prepared by TBA Á NbF 6 is of low quality and does not exhibit a superconducting behavior.…”

The structures of di(2,3,6,7-tetramethyl-1,4,5,8-tetraselenafulvalenium) perrhenate, (TMTSF)2ReO4, and perchlorate, (TMTSF)2ClO4

“…0567-7408/82/112805-04501.00 (Bechgaard, Caneiro, Rasmussen, Olsen, Rindorf, Jacobsen, Pedersen & Scott, 1981). The other salts of this series also exhibit superconductivity around 1 K, but only under a hydrostatic pressure of the order of 1 GPa.…”