Tetraalkyl- and dialkyl-substituted BEDT-TTF derivatives and their cation-radical salts: synthesis, structure, and properties

Autor:	Seddon Y. Thomas, J.D. Dudek, Hsien-Hau Wang, Felix Rivas, Jack M. Williams, Aravinda M. Kini, Urs Geiser, Ernest DiNino, James P. Parakka
Rok vydání:	1999
Předmět:	chemistry.chemical_classification Inorganic chemistry Crystal growth Electron donor General Chemistry Crystal structure chemistry.chemical_compound chemistry Oxidation state Polymer chemistry Materials Chemistry Molecule Solubility Tetrathiafulvalene Alkyl
Zdroj:	Journal of Materials Chemistry. 9:883-892
ISSN:	1364-5501 0959-9428
DOI:	10.1039/a809132c
Popis:	Tetraalkyl and dialkyl derivatives, where alkyl=ethyl and propyl, of the organic electron donor molecule bis(ethylenedithio)tetrathiafulvalene, BEDT-TTF or ET, have been synthesized via the Diels-Alder approach. Several cation-radical salts of these new donors have been prepared and structurally characterized, and found to contain donor molecules in nominally higher oxidation states (+1, +1.5 and +2) than the typically observed oxidation state of +0.5 in BEDT-TTF salts. The higher solubility of the tetraalkyl and dialkyl derivatives in solvents used for crystal growth is proposed as the principal reason for this finding. Surprisingly, X-ray crystallographic studies reveal that the alkyl groups in the neutral tetraethyl-ET as well as the oxidized tetraethyl-ET and diethyl-ET molecules in their cation-radical salts adopt axial configurations, rather than the expected equatorial configurations. Electrical properties of the cation-radical salts have been found to be either insulating or semiconducting, consistent with the higher oxidation states of the donor molecules in the salts and the crystal structures.
Databáze:	OpenAIRE
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