title: Pi-conjugated phosphasilenes stabilized by fused-ring bulky groups.
abstract: Pi-conjugated phosphasilenes with a variety of aryl substituents on the silicon atom have been synthesized by the use of a 1,1,3,3,5,5,7,7-octaethyl-s-hydrindacen-4-yl (Eind) group. X-ray structural analysis shows the highly coplanar pi-framework stabilized by the perpendicularly fixed Eind groups. The strong pi-pi* absorptions have been observed, demonstrating the extension of pi-conjugation over the skeleton. The DFT calculations indicate that the LUMO involves the substantial contribution of the 3p(pi)*(Si-P)-2p(pi)*(carbon pi-electron system) conjugation. The electrochemical properties of the phosphasilens are also presented.
authors.affiliation: Functional Elemento-Organic Chemistry Unit, RIKEN Advanced Science Institute, 2-1 Hirosawa, Wako, Saitama 351-0198, Japan.
authors.forename: Baolin
authors.initials: B
authors.lastname: Li
authors.forename: Tsukasa
authors.initials: T
authors.lastname: Matsuo
authors.forename: Daisuke
authors.initials: D
authors.lastname: Hashizume
authors.forename: Hiroyuki
authors.initials: H
authors.lastname: Fueno
authors.forename: Kazuyoshi
authors.initials: K
authors.lastname: Tanaka
authors.forename: Kohei
authors.initials: K
authors.lastname: Tamao