Journal
POLYMER
Volume 53, Issue 18, Pages 3894-3899Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.polymer.2012.07.003
Keywords
Chiral polymers; Anisotropic fluorescence; Stokes shifts
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Funding
- National Natural Science Foundation of China [21074054, 51173078, 21172106]
- National Basic Research Program of China [2010CB923303]
- Zhejiang Provincial Natural Science Foundation [Y4110141]
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Two novel chiral fluorescence polymers P-1 and P-2 incorporating (R,R)-salen-based binuclear boron complex in the main chain backbone were synthesized by (R,R)-salen-based boron complex (M-1) with 9,9-dibutyl-2,7-diethynyl-9H-fluorene (M-2) and 1,4-dibutoxy-2,5-diethynylbenzene (M-3) via Pd-catalyzed Sonogashira coupling reaction, respectively. The chiral polymers were characterized by H-1 NMR, UV-vis spectroscopy, photoluminescence (PL), gel permeation chromatography (GPC), TGA, DSC, cyclic voltammetry (CV), and theoretical calculation using density-functional theory (DFT) method. P-1 and P-2 show anisotropic fluorescence property with emission spectral maxima at 474 nm and 514 nm, respectively. Both two chiral polymers can exhibit high fluorescence quantum yields (up to 44% and 52%) with large Stokes shifts over 90 nm. The DFT theoretical calculation of the polymer repeating units indicates that the optical band gaps of P-1 is higher than that of P-2, which was consistent with the CV determination results. (C) 2012 Elsevier Ltd. All rights reserved.
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