Synthesis and time-gated fluorometric application of a europium(III) complex with a borono-substituted terpyridine polyacid ligand
- 作者：Mingjing Liu ; Zhiqiang Ye<sup> ; sup><sup>zhiqiangye2001@yahoo.com.cnsup> ; Guilan Wang ; Jingli Yuan<sup> ; sup><sup>jingliyuan@yahoo.com.cnsup>
- 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)-Eu<sup>3+sup> (BTTA-Eu<sup>3+sup>), has been designed and synthesized as a luminescence probe for hydrogen peroxide (H<sub>2sub>O<sub>2sub>). The complex is highly luminescent in aqueous buffers to display a typical Eu<sup>3+sup> emission pattern with a sharp emission peak at 610 nm and a long luminescence lifetime of 1.34 ms. Upon reaction with H<sub>2sub>O<sub>2sub>, the deboronation derivative of BTTA-Eu<sup>3+sup>, (4鈥?hydroxy-2,2鈥?6鈥?2鈥?terpyridine-6,6鈥?diyl) bis(methylenenitrilo) tetrakis(acetate)-Eu<sup>3+sup> (HTTA-Eu<sup>3+sup>), can be generated. It was found that the luminescence of BTTA-Eu<sup>3+sup> was pH-insensitive, whereas that of HTTA-Eu<sup>3+sup> was pH-dependent and could be remarkably weakened in neutral and basic buffers, which allowed BTTA-Eu<sup>3+sup> to be a luminescence probe for the time-gated luminescence detection of H<sub>2sub>O<sub>2sub> in neutral and basic buffers. The H<sub>2sub>O<sub>2sub>-BTTA-Eu<sup>3+sup> system was applied to monitor the kinetics of the palladium-catalyzed Suzuki cross-coupling reaction between BTTA-Eu<sup>3+sup> and bromobenzene, which suggested a useful strategy for the application of time-gated luminescence technique in catalysis reaction researches.