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首页> 外文期刊>Chemistry: A European journal >Selective Sensing of Phosphates by a New Bis-heteroleptic Ru-II Complex through Halogen Bonding: A Superior Sensor over Its Hydrogen-Bonding Analogue
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Selective Sensing of Phosphates by a New Bis-heteroleptic Ru-II Complex through Halogen Bonding: A Superior Sensor over Its Hydrogen-Bonding Analogue

机译：新型双卤素Ru-II络合物通过卤素键对磷酸盐的选择性传感：优于氢键键合类似物的优越传感器

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摘要

The selective phosphate-sensing property of a bis-heteroleptic Ru-II complex, 1[PF6](2), which has a halogen-bonding iodotriazole unit, is demonstrated and is shown to be superior to its hydrogen-bonding analogue, 2[PF6](2). Complex 1[PF6](2), exploiting halogen-bonding interactions, shows enhanced phosphate recognition in both acetonitrile and aqueous acetonitrile compared with its hydrogen-bonding analogue, owing to considerable amplification of the Ru-II-center-based metal-to-ligand charge transfer (MLCT) emission response and luminescence lifetime. Detailed solution-state studies reveal a higher association constant, lower limit of detection, and greater change in lifetime for complex 1 in the presence of phosphates compared with its hydrogen-bonding analogue, complex 2. The H-1 NMR titration study with H2PO4- ascertains that the binding of H2PO4- occurs exclusively through halogen-bonding or hydrogen-bonding interactions in complexes 1[PF6](2) and 2[PF6](2), respectively. Importantly, the single-crystal X-ray structure confirms the first ever report on metal-assisted second-sphere recognition of H2PO4- and H2P2O72- with 1 through a solitary C-I center dot center dot center dot anion halogen-bonding interaction.
机译：具有卤素键合碘代三唑单元的双多官能Ru-II配合物1 [PF6]（2）的选择性磷酸盐传感性能得到了证明，并显示出优于其氢键类似物2 [ PF6]（2）。配合物1 [PF6]（2），利用卤素键相互作用，与氢键类似物相比，在乙腈和乙腈水溶液中均显示出增强的磷酸盐识别能力，这是由于Ru-II-中心金属基配体电荷转移（MLCT）发射响应和发光寿命。详细的溶液状态研究表明，与磷酸盐的氢键类似物（络合物2）相比，在磷酸盐存在下，络合物1具有更高的缔合常数，较低的检测限和更长的寿命变化。H2PO4-的H-1 NMR滴定研究分别确定了H2PO4-的结合仅通过配合物1 [PF6]（2）和2 [PF6]（2）中的卤素键或氢键相互作用而发生。重要的是，单晶X射线结构通过孤立的C-I中心点中心点中心点中心点阴离子与卤素的键合相互作用，证实了金属辅助第二球识别H2PO4-和H2P2O72-具有1的首次报道。

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