Please use this identifier to cite or link to this item: http://hdl.handle.net/10397/33115
Title: Regioselective alkyne polyhydrosilylation : synthesis and photonic properties of poly(silylenevinylene)s
Authors: Lu, P
Lam, JWY
Liu, J
Jim, CKW
Yuan, W
Chan, CYK
Xie, N
Hu, Q
Cheuk, KKL 
Tang, BZ
Issue Date: 2011
Publisher: Amer Chemical Soc
Source: Macromolecules, 2011, v. 44, no. 15, p. 5977-5986 How to cite?
Journal: Macromolecules 
Abstract: Alkyne polyhydrosilylations of 1,2-bis(4-dimethylsilanylphenyl)-1,2- diphenylethene with 4,4′-diethynylbiphenyl, bis(4-ethynyl-2-methylphenyl) dimethylsilane, 3,6-diethynyl-9-heptylcarbazole, 1,1-dimethyl-2,5-bis(4- ethynylphenyl)-3,4-diphenylsilole, and 2,5-bis(2-trimethylsilylethynyl)thiophene were mediated by Rh(PPh 3) 3Cl in THF in an regioselective fashion, furnishing poly(silylenevinylene)s with high molecular weights (M w up to 36 500) and stereoregularities (E content up to 100%) in satisfactory yields. All the polymers were processable and thermally stable, losing little of their weights when heated to ≥330 °C. Whereas the polymers were weakly emissive in the solutions, they became strong emitters when aggregated in poor solvents or fabricated as thin films in the solid state, demonstrating a phenomenon of aggregation-enhanced emission. The emissions of the polymers were quenched exponentially by picric acid with quenching constant up to 8.48 × 10 5 L mol -1, making them as highly sensitive chemosensors for explosive detection. Thin films of the polymers exhibited high refractive indices (RI = 1.7180-1.6102) in the wavelength region of 400-1700 nm, high modified Abbé numbers (v D′ up to 2303.9), and low optical dispersion (D′ down to 0.0004). Their RI values could be tuned to a large extent (Δn = 0.09), and their emissions could be faded by UV irradiation, enabling ready generation of fluorescent patterns without development.
URI: http://hdl.handle.net/10397/33115
DOI: 10.1021/ma201203w
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