title: (Z)-1,2-Di(1-pyrenyl)disilene: Synthesis, Structure, and Intramolecular Charge-Transfer Emission.
abstract: (Z)-1,2-Di(1-pyrenyl)disilene containing bulky 1,1,3,3,5,5,7,7-octaethyl-s-hydrindacen-4-yl (Eind) groups has been obtained as purple crystals by the reductive coupling reaction of the corresponding dibromosilane with lithium naphthalenide. An X-ray crystallographic analysis revealed an Eind- and pyrenyl-meshed molecular gear around the disilene core adopting the Z configuration, in which the two pyrenyl groups intramolecularly interact through the π-π stacking with a distance of 3.635 Å between the centers of the two pyrene rings. The disilene π-system exhibits a π(Si-Si) → π*(pyrene) intramolecular charge-transfer (ICT) fluorescence at room temperature, whose wavelengths depend on the solvent polarity. The photophysical properties are theoretically supported by computational studies including excited-state calculations.
authors.affiliation: Functional Elemento-Organic Chemistry Unit, RIKEN Advanced Science Institute , 2-1 Hirosawa, Wako, Saitama 351-0198, Japan.
authors.forename: Megumi
authors.initials: M
authors.lastname: Kobayashi
authors.affiliation: Department of Applied Chemistry, Faculty of Science and Engineering, Kinki University , 3-4-1 Kowakae, Higashi-Osaka 577-8502, Japan.
authors.forename: Naoki
authors.initials: N
authors.lastname: Hayakawa
authors.affiliation: Functional Elemento-Organic Chemistry Unit, RIKEN Advanced Science Institute , 2-1 Hirosawa, Wako, Saitama 351-0198, Japan.|Department of Applied Chemistry, Faculty of Science and Engineering, Kinki University , 3-4-1 Kowakae, Higashi-Osaka 577-8502, Japan.|JST, PRESTO , 4-1-8 Honcho Kawaguchi, Saitama 332-0012, Japan.
authors.forename: Tsukasa
authors.initials: T
authors.lastname: Matsuo
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.affiliation: Materials Characterization Support Unit, RIKEN Center for Emergent Matter Science (CEMS) , 2-1 Hirosawa, Wako, Saitama 351-0198, Japan.
authors.forename: Takeo
authors.initials: T
authors.lastname: Fukunaga
authors.affiliation: Materials Characterization Support Unit, RIKEN Center for Emergent Matter Science (CEMS) , 2-1 Hirosawa, Wako, Saitama 351-0198, Japan.
authors.forename: Daisuke
authors.initials: D
authors.lastname: Hashizume
authors.affiliation: Department of Molecular Engineering, Graduate School of Engineering, Kyoto University , Nishikyo-ku, Kyoto 615-8510, Japan.
authors.forename: Hiroyuki
authors.initials: H
authors.lastname: Fueno
authors.affiliation: Department of Molecular Engineering, Graduate School of Engineering, Kyoto University , Nishikyo-ku, Kyoto 615-8510, Japan.
authors.forename: Kazuyoshi
authors.initials: K
authors.lastname: Tanaka
authors.affiliation: Functional Elemento-Organic Chemistry Unit, RIKEN Advanced Science Institute , 2-1 Hirosawa, Wako, Saitama 351-0198, Japan.
authors.forename: Kohei
authors.initials: K
authors.lastname: Tamao