Optical fluoride sensor based on monomer-dimer equilibrium of scandium(III)-octaethylporphyrin in a plasticized polymeric film.

Optical fluoride sensor based on monomer-dimer equilibrium of scandium(III)-octaethylporphyrin in a plasticized polymeric film.
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基于增塑聚合物薄膜中钪(III)-八乙基卟啉单体-二聚体平衡的光学氟化物传感器。

DOI:
10.1016/j.aca.2007.07.048
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发表时间:
2007
影响因子:
6.2
通讯作者:
Meyerhoff,MarkE
Meyerhoff,MarkE
中科院分区:
化学1区
文献类型:
--
作者:
Kang,Youngjea;Kampf,JeffW;Meyerhoff,MarkE

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介绍了一种基于Sc(III)-八乙基卟啉(Sc(III)OEP)作为离子载体的增塑聚氯乙烯膜氟选择性光学传感器。水相样品中氟离子的存在增加了聚合物膜中二氟桥联Sc(III)-OEP二聚体的形成。UV-Vis光谱和X射线结晶学证实了Sc(III)卟啉在氟化物存在下形成二聚体结构的能力。为了更实际的传感应用,将pH色团(ETH 7075)与Sc(III)OEP一起添加到塑化的聚氯乙烯薄膜中,观察到的光学响应基于质子与样品相氟化物的共萃取,以生成二聚卟啉和质子化的发色团物种。观察到的选择性模式为F-−≫-ClO_4-−,SCN-−,NO_3-−>Br-−,Cl-−。只有有机水杨酸盐才是重要的干扰物。在10−4到10−2M氟化物的范围内,观察到快速和可逆的氟化物响应,允许在波导型结构中使用传感膜进行流动注射测量。
A fluoride-selective optical sensor based on scandium(III)-octaethylporphyrin (Sc(III)OEP) as an ionophore within a plasticized PVC film is described. The presence of fluoride ion in the aqueous sample phase increases the formation of a difluoro-bridged Sc(III)OEP dimer species in the polymer film. The ability of the Sc(III) porphyrin to form the dimeric structure in the presence of fluoride is confirmed by UV–vis spectroscopy and X-ray crystallography. For more practical sensing applications, a pH chromoionophore (ETH 7075) is added to the plasticized PVC film along with Sc(III)OEP and the observed optical response is based on coextraction of protons with sample phase fluoride to create the dimeric porphyrin and a protonated chromoionophore species. The selectivity pattern observed is F−≫ClO4−, SCN−, NO3−>Br−, Cl−. Only organic salicylate is a significant interferent. Fast and reversible fluoride response is observed over the range of 10−4to 10−2M fluoride, allowing use of the sensing film in a waveguide configuration for flow-injection measurements.
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