Three new AIE-cored luminescent Cd-based MOFs with high quantum yields and selective detection of ions in aqueous media†

IF 2.6 3区化学 Q2 CHEMISTRY, MULTIDISCIPLINARY

CrystEngComm Pub Date : 2024-06-03 DOI:10.1039/D4CE00446A

Wei-Min Chen, Yi Zhang, Zhen-Dong Xue, Hao-Yu Zhu, Qiang Gao, Li-Zhuang Chen and Fang-Ming Wang

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Abstract

Herein, we synthesized three new LMOFs, [Cd(TPPE)_0.5(oba)(H₂O)]_n (LMOF-1), [Cd₂(TPPE)(bpdc)₂]_n (LMOF-2), and [Cd₂(TPPE)(sdc)₂]_n (LMOF-3) (TPPE = 1,1,2,2-tetra[4-(pyridin-4-yl)phenyl]ethylene, oba = 4,4′-diphenyl ether dicarboxylic acid, bpdc = 4,4′-biphenyl dicarboxylic acid, sdc = 4,4′-styrene dicarboxylic acid), with high quantum yields of 43.74%, 36.68% and 45.89%, respectively, exceeding those reported for most Cd-based LMOFs. All three LMOFs have good detection sensitivity for Fe³⁺, CrO₄²⁻ and Cr₂O₇²⁻. Surprisingly, Na⁺ can rarely but significantly enhance the fluorescence intensity of LMOF-3, and the detection limit is 1.90 × 10⁻⁵ M. This is the first reported LMOF material that can quantitatively analyze Na⁺ among references. All results indicate that the three MOFs can be developed into phosphor materials and fluorescent chemical sensors for detecting ions in water.

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三种新型 AIE 涂层发光镉基 MOF，具有高量子产率和水介质中离子的选择性检测功能

在此合成了三种新的 LMOFs，即[Cd(TPPE)0.5(oba)(H2O)]n（LMOF-1）、[Cd2(TPPE)(bpdc)2]n（LMOF-2）、[Cd2(TPPE)(sdc)2]n（LMOF-3）（TPPE=1,1,2,2-四[4-(吡啶-4-基)苯基]乙烯，oba=4、4'-二苯醚二羧酸，bpdc=4,4'-联苯二羧酸，sdc=4,4'-苯乙烯二羧酸），量子产率高达 43.74%、36.68% 和 45.89%，超过了大多数已报道的镉基 LMOF。这三种 LMOF 对 Fe3+、CrO42- 和 Cr2O72- 都具有良好的检测灵敏度。令人惊讶的是，Na+很少能显著增强 LMOF-3 的荧光强度，其检测限为 1.90×10-5 M。所有这些结果都表明，这三种 MOFs 在荧光粉材料和荧光化学传感器检测水中离子方面具有广阔的发展前景。

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