55259-49-9Relevant articles and documents
Ambient-pressure organic superconductors κ-(DMEDOTSeF) 2[Au(CN)4](Solv.): Tc tuning by modification of the solvent of crystallization
Shirahata, Takashi,Kibune, Megumi,Yoshino, Hiroko,Imakubo, Tatsuro
, p. 7619 - 7630 (2007)
The unsymmetrical π donor dimethyl(ethylenedioxy)tetraselenafulvalene (DMEDO-TSeF) has provided six new organic superconductors with a monovalent square-planar [Au(CN)4] ion and cyclic ethers as solvent of crystallization. The six new organic superconductors κ-(DMEDOTSeF) 2[Au(CN)4](Solv.) [solv. = 1,3-dioxolane (DOL), 2,5-dihydrofuran (DHF), tetrahydropyran (THP), 1,3-dioxane (1,3-DOX), 3,4-dihydro-2Hpyran (DHP), or 1,4-dioxane (1,4DOX)] are classified into two subphases κL and κ′ according to the differen ces in their space group symmetry. κL(DMEDO-TSeF) 2[Au(CN)4](Solv.) (solv. = DOL, DHF, THP, 1,3-DOX or DHP) crystallizes in the orthorhombic space group Prima, and Tc of the κL phase varies by 1.7-5.3 K according to the size and shape of the solvent of crystallization. On the other hand, κ′ (DMEDO-TSeF)2[Au(CN)4](Solv.) (solv. = DOL or 1,4-DOX) crystallizes in the noncentrosymmetric monoclinic space group Cc. The κ′-phase containing 1,4-DOX shows superconductivity at 4.2 K, but the κ′-phase containing DOL does not show superconductivity down to 1.4 K. Systematic investigation of the six new organic superconductors, together with the two previously reported superconductors κH- and κL(DMEDO-TSeF)2[Au(CN)4](THF), revealed that the Tc of the present system is finely tunable by utilizing the effect of the solvent of crystallization.
Engler et al.
, p. 835 (1977)
Molecular modifications of methylenedithio-tetraselenafulvalene (MDT-TSF) and methylenedithio-diselenadithiafulvalene (MDT-ST) for superior electron donors
Takimiya, Kazuo,Kataoka, Yoshiro,Nakamura, Yuki,Aso, Yoshio,Otsubo, Tetsuo
, p. 1315 - 1320 (2007/10/03)
The dimethyl-, bis(methylthio)-, and ethylenedithio-derivatives of methylenedithio-tetraselenafulvalene and methylenedithio-diselenadithiafulvalene have been synthesized as new electron donors. The formation and electrical conductivities of their radical
NEW CONDUCTING SALTS CONTAINING UNSYMMETRICAL ?-DONORS
Giral, L.,Fabre, J. M.,Gouasmia, A.
, p. 4315 - 4318 (2007/10/02)
This communication describes the synthesis and the electrochemical properties of a new type of donor containing sulfur or selenium atoms: the dimethyltetramethylenetetraselenafulvalene 1 and the dimethyltetramethylenetetrathiafulvalene 2.The electrical conductivity of their charge transfer complexes and of some of their radical cation salts are reported.