ANION-SELECTIVE OPTICAL SENSING WITH METALLOPORPHYRIN-DOPED POLYMERIC FILMS
ANION-SELECTIVE OPTICAL SENSING WITH METALLOPORPHYRIN-DOPED POLYMERIC FILMS
复制标题
DOI：
10.1016/0003-2670(93)85281-n
复制
发表时间：
1993-11-26
影响因子：
6.2
通讯作者：
MEYERHOFF, ME
中科院分区：
文献类型：
--
作者：
WANG, EJ;MEYERHOFF, ME
金属卟啉[Mn（III）和In（III）]作为活性聚合物膜组分在可逆阴离子选择性光学传感器的设计中进行了研究。光学测量是通过铸造薄塑化聚合物膜（PVC，聚氨酯等）。在玻璃板上含有给定的金属卟啉。当浸泡在测试水溶液中时，这种薄膜的光学响应是基于金属卟啉选择性地将阴离子萃取到有机膜相中。吸光度的变化通过两种机制之一发生。对于基于Mn（III）四苯基卟啉的膜，卟啉本身可以同时作为用于检测碘离子的离子载体和发色团。在这种情况下，碘离子作为中心Mn（III）的轴向配体的直接连接导致卟啉的soret带的摩尔吸光系数的变化。在In（III）八乙基卟啉的情况下，需要将适当的pH指示剂染料沿着与金属卟啉结合以获得对亚硝酸盐和氯化物具有光学选择性的膜。这些卟啉为基础的膜的分析特性，相对于阴离子响应时间，动态测量范围，和再现性，进行了讨论。
Metalloporphyrins [Mn(III) and In(III)] are investigated as active polymer film components in the design of reversible anion-selective optical sensors. The optical measurements are made by casting thin plasticized polymer films (PVC, polyurethane, etc.) containing the given metalloporphyrins on glass plates. When bathed in aqueous test solutions, the optical response of such films is based upon the selective extraction of anions by metalloporphyrins into the organic membrane phase. Changes in optical absorbance occur via either of two mechanisms. For films based on Mn(III) tetraphenylporphyrins, the porphyrin itself can serve simultaneously as the ionophore and chromophore for the detection of iodide ions. In this instance, direct ligation of iodide as an axial ligand of the central Mn(III) results in a change in the molar absorptivity of the soret band of the porphyrin. In the case of In(III) octaethylporphyrin, the incorporation of an appropriate pH-indicator dye along with the metalloporphyrin is required to achieve films with optical selectivity toward nitrite and chloride. The analytical characteristics of these porphyrin-based films with respect to anion response time, dynamic measurement range, and reproducibility, are discussed.