title: σ-π conjugated organosilicon hybrid polymers from copolymerization of a tetrasiladiene and 1,4-diethynylbenzene.
abstract: A catalyst- and by-product-free protocol for the synthesis of σ-π conjugated organosilicon polymers is reported. The regiospecific [2+2] cycloaddition of C≡C triple bonds to Si=Si double bonds allowed the preparation of air-stable ethynyl-terminated extended monomers from 1,4-bis(ethynyl)benzene and the para-phenylene bridged tetrasiladiene, Tip2 Si=SiTip-pC6H4-SiTip=SiTip2 (Tip = 2,4,6-iPr3C6H2). The polymer obtained from the extended monomer and further tetrasiladiene exhibits pronounced σ-π conjugation, as was evident from the red-shift in the absorption spectrum compared to model systems. We show that the thermal stability of the employed bis(alkyne) co-monomer is translated into this polymer.
authors: Krupp-Chair of General and Inorganic Chemistry, Saarland University, 66125 Saarbrücken (Germany), Fax: (+49) 681302-71642.
authors: Moumita
authors: M
authors: Majumdar
authors: Iulia
authors: I
authors: Bejan
authors: Volker
authors: V
authors: Huch
authors: Andrew J P
authors: AJ
authors: White
authors: George R
authors: GR
authors: Whittell
authors: André
authors: A
authors: Schäfer
authors: Ian
authors: I
authors: Manners
authors: David
authors: D
authors: Scheschkewitz
keywords: conjugation; copolymerization; cycloaddition; hybrid polymers; silicon