Novel chemosensory materials based on polyfluorenes with 2-(2′-pyridyl)-benzimidazole and groups in 5-methyl-3-(pyridin-2-yl)-1,2,4-triazole the side chain
Novel chemosensory materials based on polyfluorenes with 2-(2′-pyridyl)-benzimidazole and groups in 5-methyl-3-(pyridin-2-yl)-1,2,4-triazole the side chain
复制标题
DOI：
10.1016/j.polymer.2007.01.011
复制
发表时间：
2007-02-23
期刊：
影响因子：
4.6
通讯作者：
Cao, Yong
中科院分区：
文献类型：
--
作者：
Du, Bin;Liu, Ransheng;Cao, Yong
采用Suzuki缩聚法合成了侧链含有2-(2-吡啶基)-苯并咪唑(P1、P2和P4)和5-甲基-3-(吡啶-2-伊)-1，2，4-三氮唑(M)基团的聚荧烯。通过吸收光谱和发射光谱研究了聚合物对金属离子和H+的响应特性。由于共轭聚合物的电子通讯性能增强，聚合物(P1-P4)对过渡金属离子Co2+、Ni2+、Fe3+和Ag+的荧光被完全猝灭。结果表明，P1和P4聚合物对Ni2+离子的响应灵敏度有明显差异。当加入3.2×10~(-6)M和5.0×10~(-6)M的Ni2+溶液时，P_1和P_4的荧光分别猝灭到50(I-0/I)和22(I-0/I)。由于侧链上的受体不同，分别加入1.0×10~(-4)M的Al3+溶液时，P2和P3的荧光被完全或几乎不猝灭。在猝灭剂浓度低至5ppm的范围内，由于受体与离子的络合能力不同，P2对Ni2+离子表现出良好的选择性。与低聚吡啶功能化共轭聚合物不同，Cu2+和Mn2+离子对聚合物(P1-P4)的荧光几乎没有猝灭作用。这一结果进一步打开了通过适当改变侧链和共轭主干上的受体来开发定制感觉材料的机会。(C)2007爱思唯尔有限公司。保留所有权利。
Polyfluorenes with 2-(2-pyridyl)-benzimidazole (P1, P2 and P4) and 5-methyl-3-(pyridin-2-yi)-1,2,4-triazole (M) groups in the side chain were synthesized by Suzuki polycondensation. The responsive properties of polymers on metal ions and H+ were investigated by absorption and emission spectra. The fluorescences of polymers (P1-P4) were completely quenched upon the transition metal ions such as Co2+, Ni2+, Fe3+ and Ag+ due to the enhanced electronic communication properties of conjugated polymers. The obvious differences to Ni2+ ion responsive sensitivity were observed between P1 and P4 polymers. The fluorescences of P I and P4 were quenched to 50 (I-0/I) and to 22 (I-0/I) upon the addition of a Ni2+ solution of 3.2 x 10(-6) M, as well as 5.0 x 10(-6) M, respectively, owing to the different conjugated backbone. The fluorescences of P2 and P3 were completely and hardly quenched upon the addition of a Al3+ solution of 1.0 x 10(-4) M, respectively, owing to the different receptors in the side chain. P2 showed good selectivity to Ni2+ ion in the range of quencher concentration as low as 5 ppm, owing to the different chelating abilities of receptor with ions. Cu2+ and Mn2+ ions hardly quenched the fluorescences of polymers (P1-P4), which were different from the oligopyridyl-functionalized conjugated polymers. The results further opened the opportunities to develop the tailored sensory materials through the appropriate alteration of receptors in the side chain and the conjugated backbone. (c) 2007 Elsevier Ltd. All rights reserved.