NDLI: Self-enhanced electrogenerated chemiluminescence of ruthenium(II) complexes conjugated with Schiff bases

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Self-enhanced electrogenerated chemiluminescence of ruthenium(II) complexes conjugated with Schiff bases

Content Provider	World Health Organization (WHO)-Global Index Medicus
Author	Li, Panpan Xu, Yanxue Jin, Zhaoyu Zhao, Meilian Xiao, Dan Guo, Yong
Description	Author Affiliation: Li P ( Key Laboratory of Green Chemistry and Technology, Ministry of Education, College of Chemistry, Sichuan University, Chengdu 610064, P. R. China. xiaodan@scu.edu.cn.)
Abstract	In this work, we obtain two ruthenium(II) complexes with Schiff base cavities that exhibit significantly enhanced electrochemiluminescence (ECL) intensity and quantum efficiency due to $Ru(bpy)_{3}^{2+}$ in aqueous solution, without the addition of tri-n-propylamine (TPrA). The great increase in ECL intensity is confirmed to be due to the electrochemical oxidation of phenolic hydroxyl groups and the resonant structure of imino radicals. Thus, the electrons are transferred intramolecularly to the Ru(III) center, leading to efficient generation of the excited state of Ru(II)*. Subsequently, we find that $Co^{2+}$ bonding with the salen cavity can selectively and quickly quench the ECL signal. Furthermore, we study the mechanism of the process by which $Co^{2+}$ hinders the oxidation of phenolic groups and blocks the electron transfer from imino radicals to the Ru center. Thus, a highly sensitive and selective ECL probe for the recognition of $Co^{2+}$ was developed with a stable response over a concentration range of 0.9 μM to 6.3 μM and a detection limit as low as 21 nM.
ISSN	14779226
Issue Number	5
Journal	Dalton Trans.
Volume Number	44
e-ISSN	13645447
Language	English
Publisher	Royal Society of Chemistry
Publisher Date	2015-02-07
Publisher Place	Great Britain (UK)
Access Restriction	Subscribed
Subject Keyword	Chemistry
Content Type	Text
Resource Type	Article
Subject	Inorganic Chemistry

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