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通过Suzuki偶合反应合成出一种主链中含2,7-取代咔唑的蓝光发射共轭聚合物,聚[2,7-(9,9-二辛基芴)-co-2,7-N-十二烷基咔唑](PF27Cz).随着I-(NaI水溶液)的加入,I-的重原子效应使PF27Cz溶液(THF)的荧光逐渐淬灭,其溶液的外观颜色由无色变为浅黄色.通过在相同条件下的对比实验可知其他阴离子的引入并未使PF27Cz的光学性质产生类似的变化.利用Hg2+与I-之间的高结合常数与络合配比,Hg2+的加入使PF27Cz-I-络合物的荧光逐渐回复,其外观颜色也由浅黄色回复至无色.通过对PF27Cz-I-在递增浓度Hg2+存在下的荧光发射性质进行分析可知其对Hg2+的检出限达约为1.6×10-8mol/L.通过对比实验可知背景金属阳离子的存在对Hg2+的光学响应并无明显的干扰.实验结果表明PF27Cz是一类具有较高灵敏度和抗干扰性的turn-on型Hg2+光学探针材料.
A blue light-emitting conjugated polymer containing 2,7-substituted carbazole in the main chain, a poly [2,7- (9,9-dioctylfluorene) -co-2,7- (PF27Cz). With the addition of I- (aqueous NaI), the heavy atom effect of I- gradually quenched the fluorescence of the PF27Cz solution (THF), and the appearance color of the solution was changed from colorless Into a light yellow.According to comparative experiments under the same conditions that the introduction of other anions did not make a similar change in the optical properties of PF27Cz Hg2 + and I- using high binding constants and complex ratio, the addition of Hg2 + The fluorescence of PF27Cz-I-complex gradually recovered, and the appearance color of the PF27Cz-I-complex recovered from light yellow to colorless.The detection of Hg2 + by analyzing the fluorescence emission properties of PF27Cz-I- in the presence of increasing concentration of Hg2 + The limit of about 1.6 × 10-8mol / L. Through the comparative experiment shows that the presence of background metal cation on the optical response of Hg2 + no significant interference.The experimental results show that PF27Cz is a type of high sensitivity and anti-interference turn- on Hg2 + optical probe material.