Large stokes shift chiral polymers containing (R,R)-salen-based binuclear boron complex: Synthesis, characterization, and fluorescence properties

Large stokes shift chiral polymers containing (R,R)-salen-based binuclear boron complex: Synthesis, characterization, and fluorescence properties
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含有 (R,R)-salen 基双核硼配合物的大斯托克斯位移手性聚合物:合成、表征和荧光性质

DOI:
10.1016/j.polymer.2012.07.003
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发表时间:
2012-08
期刊:
影响因子:
4.6
通讯作者:
Chengjian Zhu
Chengjian Zhu
中科院分区:
化学2区
文献类型:
--
作者:
Jing Yang;Xiaobo Huang;Yixiang Cheng;Chengjian Zhu

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以(R,R)-salen双核硼配合物(M-1)分别与9,9-二乙炔基-2,7-二乙炔基-9H-芴(M-2)和1,4-二丁氧基-2,5-二乙炔基苯(M-3)通过钯催化的Sonogashira偶联反应合成了两种新型手性荧光聚合物P-1和P-2。采用1H NMR、UV-vis光谱、光致发光(PL)、凝胶渗透色谱(GPC)、TGA、DSC、循环伏安(CV)等方法对手性聚合物进行了表征,并采用密度泛函理论(DFT)进行了理论计算。P-1和P-2具有各向异性的荧光性质,其最大发射波长分别为474 nm和514 nm。这两种手性聚合物都可以表现出高的荧光量子产率(高达44%和52%),具有超过90 nm的大斯托克斯位移。对聚合物重复单元的DFT理论计算表明,聚合物P-1的光学带隙大于聚合物P-2,这与CV测定结果一致。
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 by1H 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.
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