title: New organic superconductors consisting of an unprecedented pi-electron donor.
abstract: The synthesis and electrochemical properties of a new organic donor, (1,4-dioxan-2,3-diyldithio)dihydrotetrathiafulvalene (DODHT), and the crystal structures and physical properties of its superconducting salts are described. The DODHT molecule has the bulky dioxane ring condensed by cis fusion, and the reduced pi-electron system of DODHT, as compared with conventional tetrachalcogenafulvalene donors, leads to both the weak electron-donating ability and the large on-site Coulomb energy. Nevertheless, DODHT produces the superconducting AsF6 and PF6 salts, which are isostructural and exhibit superconducting transitions at 3.3 and 3.1 K, respectively, under 16.5 kbar.
authors.affiliation: Department of Chemistry, Graduate School of Science, Tokyo Metropolitan University, Hachioji, Tokyo 192-0397, Japan.
authors.forename: Hiroyuki
authors.initials: H
authors.lastname: Nishikawa
authors.forename: Takanobu
authors.initials: T
authors.lastname: Morimoto
authors.forename: Takeshi
authors.initials: T
authors.lastname: Kodama
authors.forename: Isao
authors.initials: I
authors.lastname: Ikemoto
authors.forename: Koichi
authors.initials: K
authors.lastname: Kikuchi
authors.forename: Jun-ichi
authors.initials: J
authors.lastname: Yamada
authors.forename: Harukazu
authors.initials: H
authors.lastname: Yoshino
authors.forename: Keizo
authors.initials: K
authors.lastname: Murata