College of Chemistry, Sichuan University, Chengdu, 610065, P. R. China.
Analyst. 2010 Mar;135(3):630-5. doi: 10.1039/b916435a. Epub 2010 Jan 15.
In this paper, we described the electrogenerated chemiluminescence (ECL) processes of tris(2,2'-bipyridine) ruthenium(II) (Ru(bpy)(3)(2+)) in room-temperature ionic liquid (RTIL). The results showed that ECL signals in RTIL, 1-butyl-3-methylimidazolium tetrafluoroborate ([Bmim]BF(4)), were stronger than those obtained in aqueous solutions, which means that the RTIL could be used as a good solvent for ECL. The effect of tri-n-propylamine (TPrA) on the ECL process in [Bmim]BF(4) was also investigated and the results showed that the ECL peak occurred at 1.9 V, which is more positive than the previous reports in aqueous solutions, and the ECL intensity reached the maximum when the scan rate of CV is 200 mV s(-1). Moreover, the ECL signal can be quenched by oxygen due to the reaction of oxygen with TPrA* and Ru(bpy)(3)(+). Finally, the inhibition of Ru(bpy)(3)(2+) ECL by water-insoluble analyte, naphthol, was carried out and the results showed that the ECL signal can be quenched completely by naphthol at a very low concentration (1.0 x 10(-6) M).
本文描述了三（2,2'-联吡啶）钌（II）（Ru(bpy)(3)(2+)）在室温离子液体（RTIL）中的电致化学发光（ECL）过程。结果表明，RTIL（1-丁基-3-甲基咪唑四氟硼酸盐([Bmim]BF(4))）中的 ECL 信号比水溶液中的强，这意味着 RTIL 可以作为 ECL 的良好溶剂。还研究了三正丙胺（TPrA）对[Bmim]BF(4)中 ECL 过程的影响，结果表明 ECL 峰出现在 1.9 V，比以前在水溶液中的报道更正，并且当 CV 的扫描速率为 200 mV s(-1)时，ECL 强度达到最大值。此外，由于氧气与 TPrA*和 Ru(bpy)(3)(+)的反应，氧气会使 ECL 信号猝灭。最后，对疏水性分析物萘酚对 Ru(bpy)(3)(2+)ECL 的抑制作用进行了研究，结果表明萘酚在非常低的浓度（1.0 x 10(-6) M）下即可完全猝灭 ECL 信号。
