Ambient-pressure organic superconductors kappa-(DMEDO-TSeF)2[Au(CN)4](solv.): Tc tuning by modification of the solvent of crystallization.

Ambient-pressure organic superconductors kappa-(DMEDO-TSeF)2[Au(CN)4](solv.): Tc tuning by modification of the solvent of crystallization.
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常压有机超导体 kappa-(DMEDO-TSeF)2[Au(CN)4](solv.):通过修改结晶溶剂来调节 Tc。

DOI:
10.1002/chem.200700314
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发表时间:
2007
期刊:
影响因子:
--
通讯作者:
T. Imakubo
T. Imakubo
中科院分区:
--
文献类型:
--
作者:
T. Shirahata;M. Kibune;H. Yoshino;T. Imakubo

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非对称给体二甲基(乙烯二氧基)四烯丙烯(DMEDO-TSeF)以一价方平面[Au(CN)(4)](-)离子和环醚为结晶溶剂,提供了6种新的有机超导体。六种新型有机超导体kappa-(DMEDO-TSeF)(2)[Au(CN)(4)](solv.)[solv.=1,3-二恶烷(DOL), 2,5-二氢呋喃(DHF),四氢吡喃(THP), 1,3-二恶烷(1,3- dox), 3,4-二氢- 2h -吡喃(DHP),或1,4-二恶烷(1,4- dox)]根据其空间群对称性的差异分为kappa(L)和kappa'两个亚相。卡帕(L) - (DMEDO-TSeF)(2)(非盟(CN)(4)](溶剂)。(solv.=DOL, DHF, THP, 1,3- dox或DHP)在正交空间群Pnma中结晶,kappa(L)相的T(c)根据结晶溶剂的大小和形状变化1.7-5.3 K。另一方面,kappa′-(DMEDO-TSeF)(2)[Au(CN)(4)](solv.)(solv.=DOL或1,4- dox)在非中心对称单斜空间群Cc中结晶,含有1,4- dox的kappa‘相在4.2 K时表现出超导性,而含有DOL的kappa’相在1.4 K时不表现出超导性。系统研究了六种新型有机超导体,以及先前报道的两种超导体kappa(H)-和kappa(L)-(DMEDO-TSeF)(2)[Au(CN)(4)](THF),发现该体系的T(c)可以利用结晶溶剂的作用进行精细调节。
The unsymmetrical pi 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 kappa-(DMEDO-TSeF)(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-2H-pyran (DHP), or 1,4-dioxane (1,4-DOX)] are classified into two subphases kappa(L) and kappa' according to the differences in their space group symmetry. kappa(L)-(DMEDO-TSeF)(2)[Au(CN)(4)](solv.) (solv.=DOL, DHF, THP, 1,3-DOX or DHP) crystallizes in the orthorhombic space group Pnma, and T(c) of the kappa(L) phase varies by 1.7-5.3 K according to the size and shape of the solvent of crystallization. On the other hand, kappa'-(DMEDO-TSeF)(2)[Au(CN)(4)](solv.) (solv.=DOL or 1,4-DOX) crystallizes in the noncentrosymmetric monoclinic space group Cc. The kappa'-phase containing 1,4-DOX shows superconductivity at 4.2 K, but the kappa'-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 kappa(H)- and kappa(L)-(DMEDO-TSeF)(2)[Au(CN)(4)](THF), revealed that the T(c) of the present system is finely tunable by utilizing the effect of the solvent of crystallization.
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