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Enhanced chemical sensing for Cu2+ based on composites of ZIF-8 with small molecules

机译：基于小分子的ZIF-8复合材料增强了Cu2 +的化学感测

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Two organic molecules, pyridoxal hydrazide (PAH) and salicylaldehyde based Rhodamine B hydrazone (RBS) were integrated into zeolitic imidazolate framework-8 (ZIF-8) to give composites, namely PAH/ZIF-8 and RBS/ZIF-8. The organic molecules and ZIF-8 are proposed to be assembled via hydrogen bonds and π–π stacking in the composites. The mass fraction of PAH and RBS in the composites was calculated to be 21.86% and 29.3%. The fluorescence of PAH/ZIF-8 is quenched regularly by Cu ~(2+) . The detection limit for Cu ~(2+) was calculated to be 1.42 nM for PAH/ZIF-8, which is one order of magnitude lower than that of PAH. The detection limit for Cu ~(2+) was determined to be 0.8 μM for RBS/ZIF-8, which is three times lower than that of RBS. The two composites both display high selectivity to Cu ~(2+) over competing metal ions. The PAH/ZIF-8 fluorescent sensor was successfully applied to Cu ~(2+) determination in environmental water. PAH/ZIF-8 exhibits excellent cell membrane permeability and low cytotoxicity in cellular imaging. The enhanced chemical sensor was designed by introducing small molecules into ZIF-8 for the specific recognition of Cu ~(2+) .
机译：将两种有机分子，吡哆醛酰肼（PAH）和水杨醛的罗丹明B腙（RBS）整合到沸石咪唑酯框架-8（ZIF-8）中，得到复合材料，即PAH / ZIF-8和RBS / ZIF-8。有机分子和ZIF-8被提出通过氢键和π-π在复合材料中堆叠组装。将复合材料中PAH和RB的质量分数计算为21.86％和29.3％。通过Cu〜（2+）定期淬灭PAH / ZIF-8的荧光。 Cu〜（2+）的检测限为PAH / ZIF-8的1.42nm，这是比PAH的一个数量级。 RBS / ZIF-8测定Cu〜（2+）的检出限为0.8μm，其比RBS低三倍。两种复合材料在竞争金属离子上显示出高选择性的Cu〜（2+）。 PAH / ZIF-8荧光传感器成功应用于环境水中的Cu〜（2+）测定。 PAH / ZIF-8在细胞成像中表现出优异的细胞膜渗透性和低细胞毒性。通过将小分子引入ZIF-8的特异性识别来设计增强的化学传感器，用于Cu〜（2+）。

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