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The Effect of Ionic Strength on the Electrochemiluminescence Generation by Tris(2,2′-bipyridyl)ruthenium(II)/Tri-n-propylamine

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Chemical Research in Chinese Universities 2022年第3期38卷 816-822页

作者： HU Shifan WANG Yafeng SU Bin Institute of Analytical Chemistry Department of ChemistryKey Laboratory of Excited-State Materials of Zhejiang ProvinceZhejiang UniversityHangzhou310058P.R.China

Electrochemiluminescence(ecl)is a powerful transduction technique used in biosensing and in vitro diagnosis,while the mechanism of ecl generation is complicated and affected by various *** the effect of ionic strength on ecl generation by the classical tris(2,2′-bipyridyl)ruthenium(II)[Ru(bpy)_(3)^(2+)]/tri-n-propylamine(TPrA)system was *** is clear that the ecl intensity decreases significantly with the increase of ionic strength,most likely arising from the reduced deprotonation rate of TPrA^(+)·.We further combined microtube electrode(MTE)with ecl microscopy to unravel the evolution of ecl layer with the variation of ionic *** a low concentration of Ru(bpy)_(3)^(2+),the thickness of ecl layer(TEL)nearly kept unchanged with the ionic strength,indicating the surface-confined ecl generation is dominated by the oxidative-reduction *** at a high concentration of Ru(bpy)_(3)^(2+),ecl generation is dominated by the catalytic route and TEL increases remarkably with the increase of ionic strength,because of the extended diffusion length of Ru(bpy)_(3)^(3+) at a reduced concentration of TPrA·.

关键词： Electrochemiluminescence(ecl) ecl layer thickness ecl microscopy Ionic strength Reaction mechanism

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Imaging electrochemiluminescence layer to dissect concentration-dependent light intensity for accurate quantitative analysis

Advanced Sensor and Energy Materials

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Advanced Sensor and Energy Materials 2022年第3期1卷 24-30页

作者： Wen-Xuan Fu Ping Zhou Wei-Liang Guo Bin Su Key Laboratory of Excited-State Materials of Zhejiang Province Institute of Analytical ChemistryDepartment of ChemistryZhejiang UniversityHangzhou 310058China School of Chemistry and Materials Science Nanjing Normal UniversityNanjing 210023China

As one of most advanced transduction techniques,electrochemiluminescence(ecl),such as that generated by tris(2,20-bipyridyl)ruthenium(Ru(bpy)32þ),has been extensively used in chemical sensing and analysis,but the reaction mechanism has not been fully *** at gaining insightful mechanistic information on the coreactant system involving(Ru(bpy)32þ)and tri-n-propylamine(TPrA),herein we investigate the variation of thickness of ecl layer(TEL)with the concentration ratio of(Ru(bpy)32þ)to TPrA(cRu/cTPrA)by ecl *** carbon fiber as the working electrode,TEL was observed to grow with the increase of cRu/cTPrA *** conjunction with finite element simulations,the extension of ecl layer was rationalized to be associated with the incremental contribution of so-called“catalytic route”.This route offers an additional channel of generating remote light emission in solution,apart from surface-confined emission produced by the“oxidative-reduction route”.Given the quantitative analysis of coreactant-type analytes is often based on the calibration curve,namely a graph generated by plotting the measured light intensity of a series of standard solutions against their concentrations,the contribution of“catalytic route”particularly at a low concentration of analyte(equivalent to a relatively large cRu/cTPrA)is favorable to the analytical ***,the presence and absence of this route will result in a nonlinear and linear calibration curve,respectively,for example in the detection of TPrA and *** results highlight the microwire-based imaging approach can provide insightful mechanistic information and help unveil the concentration dependence of measured ecl intensity for precise quantitative analysis.

关键词： Reaction mechanism ecl microscopy ecl layer thickness ecl analysis Calibration curve

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