Perturbation of the tris(2,2′‐bipyridine) ruthenium(II)‐catalyzed Belousov–Zhabotinsky oscillating chemiluminescence reaction by l‐cysteine and its application

Abstract

Perturbation of the tris(2,2'-bipyridine)ruthenium(II) [Ru(bpy)(3)2+]-catalyzed Belousov-Zhabotinsky (BZ) oscillating chemiluminescence (CL) reaction induced by L-cysteine was observed in the closed system. It was found that the CL intensity was decreased in the presence of L-cysteine. Meanwhile, oscillation period and oscillating induction period were prolonged. The sufficient reproducible induction period was used as parameter for the analytical application of oscillating CL reaction. Under the optimum conditions, the changes in the oscillating CL induction period were linearly proportional to the concentration of L-cysteine in the range from 8.0 x 10(-7) to 5.0 x 10(-5 )mol L(-1) (r = 0.997) with a detection limit of 4.3 x 10(-7) mol L(-1). The possible mechanism of L-cysteine perturbation on the oscillating CL reaction was also discussed.

Oscillating chemiluminescence systems: state of the art

“…Recently, Liu and Han described the perturbation of a Ru(bpy)3 2+ -catalyzed BZ oscillating CL system by L-cysteine and application of oscillating induction period for L-cysteine determination (70). Under the optimum reaction conditions established, the changes in the oscillating CL induction period were linearly proportional to the concentration of L-cysteine in the range from 8.0 ¥ 10 -7 to 5.0 ¥ 10 -5 M with a detection limit of 4.3 ¥ 10…”

Large enhancement of oscillating chemiluminescence with [Ru(bpy)3]2+‐catalyzed Belousov–Zhabotinsky reaction in the presence of tri‐n‐propylamine

“…The most widely studied of the [Ru(bpy) 3 ] 2+ -catalyzed BZ oscillators was the reaction developed by Demas and Diemente in 1973 (12), which was based on the oxidation of KBrO 3 by malonic acid (MA) in a strongly acidic medium and was catalyzed by trace amounts of [Ru(bpy) 3 ] 2+ . This reaction took place in both closed (18,19) and open (20) systems; however, in the former oscillations gradually damped and eventually reached another equilibrium state. This reaction took place in both closed (18,19) and open (20) systems; however, in the former oscillations gradually damped and eventually reached another equilibrium state.…”

“…Later, in 1982, Bolletta et al (12) observed the first example of an oscillating CL system for the [Ru(bpy) 3 ] 2+ -catalyzed BZ reaction and reported an oscillatory CL curve with a sub-peak. This reaction took place in both closed (18,19) and open (20) systems; however, in the former oscillations gradually damped and eventually reached another equilibrium state.…”