Dual-emission ratiometric fluorescent probe-based lanthanide-functionalized hydrogen-bonded organic framework for the visual detection of methylamine
Dual-emission ratiometric fluorescent probe-based lanthanide-functionalized hydrogen-bonded organic framework for the visual detection of methylamine
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DOI：
10.1039/d1tc04613f
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发表时间：
2021-12-07
影响因子：
6.4
通讯作者：
Yan, Bing
中科院分区：
文献类型：
--
作者：
Liu, Yanhong;Xu, Xin;Yan, Bing
开发高灵敏度、高选择性的挥发性有机胺可视化传感器是材料科学领域的一个挑战。本文报道了一种Eu ~（3+）功能化的氢键有机骨架（霍夫）（Eu@Tt-TPA）用于甲胺（MA）的比率荧光检测。结构中未键合的羧基可以将Eu 3+与骨架结合产生双发射，也可以与分析物MA产生氢键。Eu@Tt-TPA在310 nm激发下，霍夫和Eu 3+分别在425 nm和615 nm处产生双发射，实现了MA在水溶液中的目视比率检测。比率式感测执行自校准效应并减少背景。此外，通过使用羟甲基纤维素钠盐将Eu@Tt-TPA固化成水凝胶，制备便携式气体传感器。当暴露于MA蒸汽时，这种基于水凝胶的传感器表现出明显的颜色变化，其随MA浓度而变化。因此，双发射比率荧光探针Eu@Tt-TPA，用于同时检测MA液体和蒸气，具有高选择性和灵敏度，低检测限（0.87 ppm）和可回收性，实现并研究用于废水中。
Developing a highly sensitive and selective visualized sensor for volatile organic amines is a challenge in materials science. Here, we report a Eu3+-functionalized hydrogen-bonded organic framework (HOF) (named Eu@Tt-TPA) for the ratiometric fluorescence detection of methylamine (MA). The unbonded carboxyl group in the structure can bind Eu3+ with the skeleton to produce double emission, and can also produce hydrogen bonds with the analyte MA. Eu@Tt-TPA exhibits a dual emission, at 425 nm for the HOF and 615 nm for Eu3+, under excitation at 310 nm, realizing the visual ratiometric detection of MA in aqueous solution. The ratiometric sensing performs a self-calibration effect and reduces the background. Furthermore, a portable gas sensor was prepared by solidifying Eu@Tt-TPA into a hydrogel using the sodium salt of hydroxymethyl cellulose. When exposed to MA vapor, this hydrogel-based sensor exhibits a distinct color change, which varied with the MA concentration. Thus, the dual emission ratiometric fluorescent probe Eu@Tt-TPA, for the simultaneous detection of MA liquid and vapor with high selectivity and sensitivity, a low detection limit (0.87 ppm) and recoverability, was achieved and investigated for use in wastewater.