Synthesis and time-gated fluorometric application of a europium(III) complex with a borono-substituted terpyridine polyacid ligand

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• 作者：Mingjing Liu ; Zhiqiang Ye ; ^{zhiqiangye2001@yahoo.com.cn} ; Guilan Wang ; Jingli Yuan ; ^{jingliyuan@yahoo.com.cn}
• 关键词：Europium complex ; Hydrogen peroxide ; Luminescence probe ; Suzuki cross-coupling reaction ; Time-gated luminescence
• 刊名：Talanta
• 出版年：2012
• 期刊代码：106_00399140
• 类别：ch
• 出版时间：15 March, 2012
• 卷：91
• 期：Complete
• 页码：116-121
• 文件大小：546 K

摘要

A new europium(III) complex with a borono-substituted terpyridine polyacid ligand, (4鈥?borono-2,2鈥?6鈥?2鈥?terpyridine-6,6鈥?diyl) bis(methylenenitrilo) tetrakis(acetate)-Eu³⁺ (BTTA-Eu³⁺), has been designed and synthesized as a luminescence probe for hydrogen peroxide (H₂O₂). The complex is highly luminescent in aqueous buffers to display a typical Eu³⁺ emission pattern with a sharp emission peak at 610 nm and a long luminescence lifetime of 1.34 ms. Upon reaction with H₂O₂, the deboronation derivative of BTTA-Eu³⁺, (4鈥?hydroxy-2,2鈥?6鈥?2鈥?terpyridine-6,6鈥?diyl) bis(methylenenitrilo) tetrakis(acetate)-Eu³⁺ (HTTA-Eu³⁺), can be generated. It was found that the luminescence of BTTA-Eu³⁺ was pH-insensitive, whereas that of HTTA-Eu³⁺ was pH-dependent and could be remarkably weakened in neutral and basic buffers, which allowed BTTA-Eu³⁺ to be a luminescence probe for the time-gated luminescence detection of H₂O₂ in neutral and basic buffers. The H₂O₂-BTTA-Eu³⁺ system was applied to monitor the kinetics of the palladium-catalyzed Suzuki cross-coupling reaction between BTTA-Eu³⁺ and bromobenzene, which suggested a useful strategy for the application of time-gated luminescence technique in catalysis reaction researches.