Abstract
The salts based on dimethylethylenedithio-tetrathiafulvalene (or DIMET) and centrosymmetrical anions MF−6(M=As, P, Sb) exhibit rather striking differences. The P and As salts crystallize as needles (as do their TMTTF homologs) but the Sb compound, as rods. Room-temperature electrical conductivities are very different (σ(P)≃σ(As)≃10Ω−1cm−1; σ(Sb)≃10−3Ω−1cm−1), as well are their low-temperature ground-states1 (spin-Peierls below 17 K for As constrating with an antiferromagnetic ordering under 10 K for Sb). An usual way to characterize organic compounds is to determine their transfer integrals wchich allow to calculate their band structure. We compare in this paper the transfer integrals of (DIMET)2AsF6 and (DIMET)2SbF6.
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References
R. Laversanne, C. Coulon, J. Amiell, E. Dupart, P. Delhaès, J.P. Morand and C. Manigand, Physical properties of radical cation salts of the dimethylethylenedithioletrathiafulvalene, Solid State Commun. 58: 765 (1986).
L. Ducasse, M. Abderrabba, J. Hoarau, M. Pesquer, B. Gallois and J. Gaultier, Temperature dependence of the transfer integrals in the (TMTSF)2X and (TMTTF)2X families, J. Phys. C.: Solid State Phys. 19: 3805 (1986).
B. Gallois, J. Gaultier, F. Bechtell, D. Chasseau, C. Hauw and L. Ducasse, (DMEDT-TTF)2X: structure of two radical cation salts with centrosymmetrical anions X=SbF6− and X=AsF6−, Synth. Metals, 19: 419 (1987).
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R. Laversanne, in “Localisation électronique et mise en ordre des spins dans les conducteurs organiques”, Thesis, Bordeaux (1987).
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© 1987 Springer Science+Business Media New York
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Ducasse, L., Abderrabba, M., Fritsch, A., Gallois, B. (1987). Transfer Integrals in (DIMET)2MF6: Comparison of EHT and CNDO Calculations. In: Delhaes, P., Drillon, M. (eds) Organic and Inorganic Low-Dimensional Crystalline Materials. NATO ASI Series, vol 168. Springer, New York, NY. https://doi.org/10.1007/978-1-4899-2091-1_24
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DOI: https://doi.org/10.1007/978-1-4899-2091-1_24
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