Two alternating BEDT-TTF packing motifs in alpha-kappa-(BEDT-TTF)2Hg(SCN)3.
The first BEDT-TTF charge transfer salt in which alternating electron-donor layers possess alpha- and kappa-type packing motifs has been synthesized. The crystal structure and physical properties of the organic conductor alpha-kappa-(BEDT-TTF)2Hg(SCN)3 are described, including a detailed description of its optical properties. The electronic behavior is dominated by a sharp metal-to-insulator transition at T = 176 K which is due to a first-order structural phase transition. The optical properties in the metallic regime are a superposition of those of the alpha- and kappa-phases, while in the insulating state the spectra become more anisotropic in the conducting plane, and the features of the two layers cannot be distinguished.
Schlueter
John A
JA
Materials Science Division, Argonne National Laboratory, Argonne, IL 60439-4831, USA. JASchlueter@anl.gov
Geiser
Urs
U
Whited
Michael A
MA
Drichko
Natalia
N
Salameh
Belal
B
Petukhov
Konstantin
K
Dressel
Martin
M