title: Two alternating BEDT-TTF packing motifs in alpha-kappa-(BEDT-TTF)2Hg(SCN)3.
abstract: 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.
authors.affiliation: Materials Science Division, Argonne National Laboratory, Argonne, IL 60439-4831, USA. JASchlueter@anl.gov
authors.forename: John A
authors.initials: JA
authors.lastname: Schlueter
authors.forename: Urs
authors.initials: U
authors.lastname: Geiser
authors.forename: Michael A
authors.initials: MA
authors.lastname: Whited
authors.forename: Natalia
authors.initials: N
authors.lastname: Drichko
authors.forename: Belal
authors.initials: B
authors.lastname: Salameh
authors.forename: Konstantin
authors.initials: K
authors.lastname: Petukhov
authors.forename: Martin
authors.initials: M
authors.lastname: Dressel