Journal
CHEMICAL SCIENCE
Volume 2, Issue 9, Pages 1850-1859Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/c1sc00300c
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Funding
- Research Grants Council of Hong Kong [603509, HKUST2/CRF/10]
- Innovation and Technology Commission [ITP/008/09NP]
- University Grants Committee of Hong Kong [AoE/P-03/08]
- National Science Foundation of China [20974028]
- Cao Gaungbiao Foundation of Zhejiang University
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We present here a new polymerisation route for the synthesis of new conjugated polymers. Decarbonylative polyadditions of diyne monomers [bis(4-ethynylphenyl) dimethylsilane, 4,4'-diethynylbiphenyl, and 1,2-bis(4-ethynylphenyl)-1,2-diphenylethene] with respective terephthaloyl dichloride and benzene-1,3,5-tricarbonyl trichloride catalyzed by [Rh(cod) Cl](2)/PPh3, [Rh(nbd)Cl]2/PPh3, [RhCp*Cl-2](2)/PPh3, [Rh(cod)(PPh3)(2)]+PF6-, or [Rh(cod)(PPh2)(CH2)(4)(PPh2)]+BF4- (cod 1,5-cyclooctadiene, nbd 2,5-norbornadiene, Cp* = pentamethyl cyclopentadienyl), proceed smoothly, producing linear and hyperbranched poly(arylene chloro Z-vinylene)s (PACVs) in regio- and stereoselective manners with high molecular weights (absolute M-w up to 5.31 x 10(5)) in high yields (up to 92%). Model reactions are designed to confirm the chemical structures of the PACVs. The resultant polymers are processable and enjoy high thermal stability. The linear PAVCs can undergo thermal curing at high temperatures and compared with their hyperbranched counterparts, they are more electronically conjugated due to the para-conjugation effect, as revealed by both experimental and theoretical studies. The light emissions of linear PAVCs with twisted tetraphenylethene units are enhanced by aggregate formation, demonstrating an unusual aggregation-enhanced emission characteristic.
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