Water-stable halide coordination polymers with dual self-trapped exciton emissions for dual-mode Hg2+ sensing,Inorganic Chemistry Frontiers

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Water-stable halide coordination polymers with dual self-trapped exciton emissions for dual-mode Hg2+ sensing
Inorganic Chemistry Frontiers ( IF 6.1 ) Pub Date : 2023-03-22 , DOI: 10.1039/d2qi02766f
Yin-Jing Shi ₁ , Xianghua Yang ₁ , Hou-Rong He ₁ , Wei-Ming Liao ₁ , Hua-Qun Zhou ₁ , Lai-Hon Chung ₁ , Lin Yu ₁ , Jun He ₁

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Metal halide-based materials are an emerging class of optical functional materials used for developing sensors and light-controlled and light-emitting devices. However, most of these materials are moisture-sensitive, which hampers their performance in real applications. In this work, a methylation-functionalized decarboxylase ligand with large steric hindrance was used to construct a two-dimensional acid- and base-stable halide coordination polymer, XCP-1. XCP-1 shows dual broadband emissions with a large full width at half maximum and a large Stokes shift, indicating that self-trapped exciton emissions originated from the deformable crystal lattice of [Pb₂I₂] centres. XCP-1 also exhibits excitation wavelength-dependent emission spectra and gives red emissions with Commission International de l'Eclairage chromaticity coordinates of (0.64, 0.36), which is close to that of the National Television Standards Committee standard (0.67, 0.33) when excited at 500 nm. Owing to the strong dual self-trapped exciton emissions and unique coordination sites of accessible O atoms, XCP-1 is capable of acting as a luminescent sensor to selectively, reversibly and sensitively detect Hg²⁺ ions, displaying an efficient dual-mode colorimetric and turn-off sensing strategy.

中文翻译：

用于双模 Hg2+ 传感的具有双自陷激子发射的水稳定卤化物配位聚合物

金属卤化物基材料是一类新兴的光学功能材料，用于开发传感器、光控和发光器件。然而，这些材料中的大多数都对水分敏感，这阻碍了它们在实际应用中的性能。在这项工作中，使用具有大空间位阻的甲基化功能化脱羧酶配体构建二维酸碱稳定的卤化物配位聚合物XCP-1。XCP-1显示具有大半峰全宽和大斯托克斯位移的双宽带发射，表明自陷激子发射源自 [Pb 2 I ₂ ]_中心的可变形晶格。XCP-1还表现出与激发波长相关的发射光谱，并给出 Commission International de l'Eclairage 色度坐标为 (0.64, 0.36) 的红色发射，在 500 nm 激发时接近国家电视标准委员会标准 (0.67, 0.33) . 由于强大的双自陷激子发射和可及O原子的独特配位点，XCP-1能够作为发光传感器选择性、可逆和灵敏地检测Hg ²⁺离子，显示出高效的双模式比色和关断感应策略。

更新日期：2023-03-22

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