title: (Oligo)aromatic species with one or two conjugated Si[double bond, length as m-dash]Si bonds: near-IR emission of anthracenyl-bridged tetrasiladiene.
abstract: A series of aryl disilenes Tip2Si[double bond, length as m-dash]Si(Tip)Ar (2a-c) and para-arylene bridged tetrasiladienes, Tip2Si[double bond, length as m-dash]Si(Tip)-LU-Si(Tip)[double bond, length as m-dash]SiTip2(3a-d) are synthesized by the transfer of the Tip2Si[double bond, length as m-dash]SiTip unit to aryl halides and dihalides by nucleophilic disilenides Tip2Si[double bond, length as m-dash]SiTipLi (Tip = 2,4,6-iPr3C6H2, Ar = aryl substituent, LU = para-arylene linking unit). The scope of the nucleophilic Si[double bond, length as m-dash]Si transfer reaction is demonstrated to also include substrates of considerable steric bulk such as mesityl or duryl halides Ar-X (Ar = Mes = 2,4,6-Me3C6H2; Ar = Dur = 2,3,5,6-Me4C6H, X = Br or I). Bridged tetrasiladienes Tip2Si[double bond, length as m-dash]Si(Tip)-LU-Si(Tip)[double bond, length as m-dash]SiTip2with more extended linking units surprisingly exhibit fluorescence at room temperature, albeit weak. DFT calculations suggest that partial charge transfer character of the excited state is a possible explanation.
authors.affiliation: Krupp-Chair of General and Inorganic Chemistry, Saarland University, 66123 Saarbrücken, Germany. scheschkewitz@mx.uni-saarland.de.
authors.forename: Naim M
authors.initials: NM
authors.lastname: Obeid
authors.forename: Lukas
authors.initials: L
authors.lastname: Klemmer
authors.forename: Daniel
authors.initials: D
authors.lastname: Maus
authors.forename: Michael
authors.initials: M
authors.lastname: Zimmer
authors.forename: Jonathan
authors.initials: J
authors.lastname: Jeck
authors.forename: Iulia
authors.initials: I
authors.lastname: Bejan
authors.forename: Andrew J P
authors.initials: AJP
authors.lastname: White
authors.forename: Volker
authors.initials: V
authors.lastname: Huch
authors.forename: Gregor
authors.initials: G
authors.lastname: Jung
authors.forename: David
authors.initials: D
authors.lastname: Scheschkewitz