A series of strongly one-dimensional organic metals with strictly uniform stacks: (o-DMTTF)2X (X = Cl, Br, I) - Archive ouverte HAL Accéder directement au contenu
Article Dans Une Revue Dalton Transactions Année : 2008

A series of strongly one-dimensional organic metals with strictly uniform stacks: (o-DMTTF)2X (X = Cl, Br, I)

Résumé

The electrocrystallization of o-dimethyl-tetrathiafulvalene in the presence of halide anions affords 2 : 1 salts formulated as [o-DMTTF]2X, (X = Cl, Br, I). The three salts are isomorphous, crystallizing in the tetragonal system, space group I ¯42d, with the halide anion on the −4 site and the o-DMTTF molecule along a two-fold axis, forming strictly uniform stacks along c, and is further stabilized by C–H· · ·X hydrogen bonds. Detailed physical investigations were performed on the bromide salt. It exhibits a metallic behaviour down to TMI = 50 K, while application of pressure moves the metal insulator transition to 39 K at 7.9 kbar. Band-structure calculations indicate a strong one-dimensional character, also confirmed by the anisotropy ratio of the conductivity, r///r⊥ = 500, as determined by two independent methods (four-contact, low-frequency transport measurements and analysis of the anisotropy of the Dysonian EPR line). The singular temperature dependence of the g tensor and the EPR line width at the phase transition suggests charge ordering.

Dates et versions

hal-00336332 , version 1 (03-11-2008)

Identifiants

Citer

Marc Fourmigué, Eric W. Reiheimer, Kim R. Dunbar, Pascale Auban-Senzier, Claude R. Pasquier, et al.. A series of strongly one-dimensional organic metals with strictly uniform stacks: (o-DMTTF)2X (X = Cl, Br, I). Dalton Transactions, 2008, pp. 4652-4658. ⟨10.1039/b805511d⟩. ⟨hal-00336332⟩
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