Development of Chemical Sensors Based on Redox-Dependent Receptors. Preparation and Characterization of Phenanthrenequinone-Modified Electrodes
作者:Yu Ge、Diane K. Smith
DOI:10.1021/ac991120w
日期:2000.4.1
The study of phenanthrenequinone(PQ)-modified electrodes, prepared by electropolymerization of a phenanthrenequinone-pyrrole derivative, is described. The surface-confined PQ is shown to behave similarly to PQ in solution, acting as a redox-dependent receptor toward aromatic ureas in aprotic solvents. Large, positive shifts in the E1/2 of the PQ0/- redox couple are observed in the presence of these ureas, due to a strong hydrogen bonding interaction between the PQ radical anion and urea. The effect is fully reversible. Of the substrates examined, only aromatic ureas produce a significant shift. Nonaromatic ureas or other HN and HO containing compounds have little effect on the E1/2. The magnitude of the shift is also independent of electrode coverage, allowing reproducible measurements to be made despite significant loss in material from the surface.
描述了通过电聚合苯并喹啉-吡咯衍生物制备的苯并喹啉(PQ)修饰电极的研究。结果表明,表面限制的PQ表现得与溶液中的PQ相似,充当了非质子溶剂中对芳香胺的氧化还原依赖性受体。在存在这些胺时,PQ0/-氧化还原对的E1/2发生了较大的正位移,这是由于PQ自由基阴离子与尿素之间强氢键作用所致。该效应是完全可逆的。在所研究的底物中,只有芳香胺能产生显著的位移。非芳香胺或其他含HN和HO的化合物对E1/2几乎没有影响。位移的大小也与电极覆盖度无关,使得尽管表面材料有显著损失,仍能进行可重复的测量。