卟啉枝接联吡啶用于高选择性铜离子荧光传感器的研究

A chemosensor for Cu^(2+) with high selectivity based on porphyrin derivative appended with bipyridine

该文合成了一种金属卟啉化合物,即酰胺键联接的四苯基卟啉锌和联吡啶(ZnTPPBPy),并首次将其用于识别二价铜离子。其中四苯基卟啉锌作为荧光基团,联吡啶作为识别基团。联吡啶与铜络合以后,通过光致电子转移过程,猝灭四苯基卟啉锌的荧光,这为铜离子荧光传感器的构建提供了理论基础。考察了该铜离子化学传感器的响应特性。铜离子响应的线性范围为3.2×10-7～1.0×10-5mol/L,工作曲线的回归方程为log(ΔF/F)=9.639+1.757log[Cu2+]。实验结果表明,在过渡金属阳离子中,除了汞离子有轻微干扰外,该传感器对铜离子具有良好的选择性。

A zinc（ Ⅱ ） porphyrin derivative appended with bipyridine has been first applied for preparation ofa Cu（ Ⅱ ） -sensitive optical chemical sensor, with the zinc（ Ⅱ ） porphyrin moiety selected as a fluorophore and the bipyridine unit chosen as a receptor. The response of the sensor is based on fluorescence quenching of zinc - porphyrin by the electron transfer process. The analytical performance characteristics of the proposed Cu（ Ⅱ ） - sensitive chemosensor were investigated. The sensor can be applied to the quantification of Cu（ Ⅱ ） with a linear range covering from 3.2 × 10^-7 ～ 1.0 × 10^-5 mol/L. The experiment results show that the proposed sensor show best response to Cu（ Ⅱ ） t in medium condition, and show excellent selectivity for Cu（Ⅱ ） over transition metal cations except Hg（ Ⅱ ）.