%0 Journal Article
%T CROSS-CONJUGATED COPOLYMER WITH DONOR-ACCEPTOR STRUCTURE——SYNTHESIS, CHARACTERIZATION, AND ION SENSING PROPERTIES<br>含电子给体-受体的交叉共轭聚合物合成及其离子传感性能
%A LIN Jianming
%A WAN Junhua
%A WANG Hongyu
%A LIU Feng
%A PENG Bo
%A WEI Wei
%A <br>林建明
%A 万俊华
%A 王洪宇
%A 刘烽
%A 彭波
%A 韦玮
%J 高分子学报
%D 2008
%I 
%X A novel fluorene-phenylene(FP) based cross-conjugated copolymer with donor-acceptor(D-A) architecture was synthesized by palladium-catalyzed Suzuki coupling reaction.In sample P1,the dibutylamino was introduced into the side chain,used as electron donor and ion receptor;the 2,1,3-benzothiadiazole was incorporated into the backbone and served as electron acceptor.For comparison,sample P2 without 2,1,3-benzothiadiazole moieties was also prepared.The chemical structure of P1 and P2 was confirmed by 1H-NMR,IR,elemental analysis and GPC.Cyclic voltammetry(CV) was used to assess the electrochemical behavior of the polymers.The HOMO levels of the P1 and P2 estimated from CV were-4.87 eV and-4.86 eV,respectively;the LUMO levels of P1 and P2 were-2.47 eV and-2.09 eV,respectively,that were consistent with the energy levels calculated by B3LYP/6-31G method.The results indicated that the manipulation of the energy levels of the HOMO and LUMO can also be achieved by the incorporation of donor-acceptor(D-A) moieties within cross-conjugated polymer systems.The presence of strong intramolecular charge transfer(ICT) in P1 was supported by the frontier orbital distribution calculated by AM1 method.Due to the ICT interactions,both the fluorescence emission of P1 and P2 exhibited strong solvatochromic effect,the fluorescence intensity of P1 decreased greatly with the increase the solvent's polarity.The optical sensing properties of P1 and P2 in dichloromethane were investigated upon addition with Cu2 ,Zn2 and H ,respectively.P1 and P2 exhibited completely dissimilar optical response to cation,which can be ascribed to much stronger ICT effect in P1.Interestingly,by adding Cu2 ,Zn2 or H into P1 solution,the fluorescence intensity was amplified,which was descried as a "turn-on" effect.The dramatic result was attributed to a strong modulation of ICT interactions by complexation with cation.However,upon coordination with a small amount of Cu2 ,the emission of P2(470 nm) was quenched and red-shifted to 512 nm;when the concentration of Cu2 was increased,the emission of P2 was blue-shifted to 435 nm.These preliminary results showed that the FP based cross-conjugated polymers with D-A structure can be served as potential sensory materials with "turn-on" property.
%K Cross-conjugated polymer
%K Donor-acceptor structure
%K Intramolecular charge transfer
%K Ion sensing
%K Amplified fluorescence
%K Turn-on<br>嵌段共聚物
%K 自组装
%K 表面粘弹性
%K 分子聚集体
%U http://www.alljournals.cn/get_abstract_url.aspx?pcid=6E709DC38FA1D09A4B578DD0906875B5B44D4D294832BB8E&cid=6579068328FE643F&jid=15971983683C7643EE80F1CE621DEB60&aid=8A7724260CCF31560E5092C5541AAB70&yid=67289AFF6305E306&iid=F3090AE9B60B7ED1&sid=EAA944F99AA73B33&eid=67C739DC23BADF58&journal_id=1000-3304&journal_name=高分子学报&referenced_num=0&reference_num=29