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

• Published in: CrystEngComm 2024-07, Vol.26 (26), p.3483-3489
• Main Authors: Chen, Wei-Min, Zhang, Yi, Xue, Zhen-Dong, Zhu, Hao-Yu, Gao, Qiang, Chen, Li-Zhuang, Wang, Fang-Ming
• Format: Article
• Language: English
• Subjects: Aqueous solutions; Chemical sensors; Dicarboxylic acids; Fluorescence; Phosphors
• ISSN: 1466-8033; 1466-8033
• DOI: 10.1039/d4ce00446a

Herein, we synthesized three new LMOFs, [Cd(TPPE) 0.5 (oba)(H 2 O)] n ( LMOF-1 ), [Cd 2 (TPPE)(bpdc) 2 ] n ( LMOF-2 ), and [Cd 2 (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 Fe 3+ , CrO 4 2− and Cr 2 O 7 2− . 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. Three novel AIE-cored Cd-LMOFs are prepared with high IQYs and can be used in phosphors materials and fluorescent chemical sensors. Moreover, LMOF-3 is the first reported LMOF material for detecting Na + with a detection limit of 1.90 × 10 −5 M.