Structures and physical properties of new ??-BEDT-TTF tris-oxalatometallate (III) salts containing chlorobenzene and halomethane guest molecules

Akutsu-Sato, A., Kobayashi, A., Mori, T., Akutsu, H., Yamada, J., Nakatsuji, S., Tumer, S.S., Day, P., Tocher, D.A., Light, M.E. and Hursthouse, M.B. (2005) Structures and physical properties of new ??-BEDT-TTF tris-oxalatometallate (III) salts containing chlorobenzene and halomethane guest molecules. Synthetic Metals, 152 (1-3), 373-376. (doi:10.1016/j.synthmet.2005.07.089).

Abstract

We report the structures and physical properties of new ??-(BEDT-TTF)4[Fe(oxalate)3]·G salts where A = H3O+, G = PhCl; A = Rb+ G = Pyridine. The structure of the PhCl salt is isomorphous with ??-(BEDT-TTF)4[(H3O)M(oxalate)3] with other guest molecules. PhCl is ordered in die hexagonal pockets formed by the [(H3O)Fe(oxalate)3] layer. The electrical conductivity is metallic down to 100 K, below which the resistivity increases with decreasing temperature. The specific conductivity at room temperature is about 10 S/cm. We also report the salt ??-(BEDT-TTF)4[RbFe(oxalate)3]·Pyridine where Rb+ replaces H3O. The electrical resistivity shows metallic behavior down to 100 K. and turns up gradually to a maximum at 65 K below which the system re-enters the metallic state down to liquid helium temperature. Neither salt shows superconductivity down to 2 K. In addition, other new ??-(BEDT-TTF)4[(H3O)M(oxalate)3]·salts with M = Cr, Ga, Fe; G = CH2Cl2, CH2ClBr, CH2Br2 are also reported.

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Contributors

Author: M.E. Light

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