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Physical properties of some BEDT‐TTF cation radical salts with polymeric anions
Author(s) -
Graja Andrzej,
Dyachenko Oleg A.
Publication year - 1996
Publication title -
macromolecular symposia
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.257
H-Index - 76
eISSN - 1521-3900
pISSN - 1022-1360
DOI - 10.1002/masy.19961040120
Subject(s) - tetrathiafulvalene , superconductivity , organic superconductor , ion , molecule , chemistry , organic anion , polymerization , anisotropy , radical ion , chemical physics , inorganic chemistry , materials science , polymer chemistry , crystallography , organic chemistry , polymer , condensed matter physics , physics , quantum mechanics
The most intensively examined and promising organic materials to show superconducting properties are ion‐radical salts in which a molecule of bis(ethylenedithio)tetrathiafulvalene (BEDT‐TTF or shorter ET) serves as an electron donor. ET is capable of creating salts with various anions. The search for an anion species for ET‐based organic superconductors is one of the approaches towards making progress in the design of these materials. Polymeric anions, which form a stable layer structure, are especially useful for this purpose. Conducting properties of the organic superconductors are determined mainly by ET packing, but the role of anions is also important. The thickness of anion layers, which effectively alters the interlayer transfer interactions of ET molecules, depends upon the anion organization. Since critical temperature of the organic superconductor increases with the decrease of the magnitude of the anisotropy of the intra‐ and interlayer interaction, the change of the layer thickness gives an opportunity to affect the T c of the superconductor. In this paper we present characteristic structures of selected ET salts, give a survey of the anions, especially polymerized anions, review some more common structural types observed, and describe some physical properties of the ET‐based organic superconductors containing polymerized anions.