BEDT-TTF salts of the unsymmetrical [M(tfadt)2] dithiolene complexes (M = Ni, Au; tfadt = S2C2(CN)(CF3)) |
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| Authors: | Olivier Jeannin |
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| Affiliation: | a Laboratoire Chimie, Ingénierie Moléculaire et Matériaux (CIMMA), UMR 6200 CNRS-Université d’Angers, Bât K, UFR Sciences, 2 Bd Lavoisier, 49045 Angers, France
b Sciences Chimiques de Rennes, UMR 6226 CNRS-Université Rennes 1, Equipe MaCSE, Bât 10C, Campus de Beaulieu, 35042 Rennes cedex, France |
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| Abstract: | Two closely related 1:1 salts are obtained upon electrocrystallization of BEDT-TTF (BEDT-TTF: bis(ethylenedithio)tetrathiafulvalene) in the presence of the isosteric [M(tfadt)2]− dithiolene complexes (tfadt: 1-trifluoromethyl-2-cyano-1,2-dithiolato), which essentially differ by their spin state, S = 0 in [Au(tfadt)2]−, S = 1/2 in [Ni(tfadt)2]−. In both [BEDT-TTF][M(tfadt)2] salts, the BEDT-TTF radical cations form chains with a strong lateral overlap and strong antiferromagnetic interactions while the paramagnetic anions in the nickel-containing salt [BEDT-TTF][Ni(tfadt)2] are essentially non-interacting. The structural differences between the nickel and gold complexes are analyzed and discussed. |
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| Keywords: | Dithiolene complexes Magnetism Gold Nickel Tetrathiafulvalene |
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