Selective fluorescent sensing of LMOFs constructed from tri(4-pyridylphenyl)amine ligand

• Published in: RSC advances Vol. 11; no. 28; pp. 16989 - 16995
• Main Authors: Ni, Jian-Ling, Liang, Yu, Shao, Juan-Juan, Li, Jun-Feng, Zhou, Ze-Yu, Wang, Fang-Ming, Chen, Li-Zhuang
• Format: Journal Article
• Language: English
• Published: England Royal Society of Chemistry 07.05.2021; The Royal Society of Chemistry
• Subjects: Aromatic compounds; Chemistry; Crystallography; Fluorescence; Metal-organic frameworks; VOCs; Volatile organic compounds; Zinc
• ISSN: 2046-2069; 2046-2069
• DOI: 10.1039/d1ra00726b

Three new luminescent metal-organic frameworks (LMOFs), [Zn(tppa)(ndc)] n ( 1 ), [Cd(tppa)(oba)] n ( 2 ), [Zn 2 (tppa)(bpdc) 2 ] n ( 3 ) (tppa = tri(4-pyridylphenyl)amine, ndc = 1,4-naphthalenedicarboxylic acid, oba = 4,4′-oxydibenzoic acid, bpdc = 4,4′-biphenyldicarboxylic acid) have been synthesized by solvothermal method. Complexes 1 and 2 are 2-D two-fold interpenetrating structures, aligning into a 3-D structure through C-H π stacking interactions, while 3 is a 5-fold interpenetrating three-dimensional structure. The internal quantum yields (IQYs) of complexes 1-3 are 32.7%, 45.7% and 24.0% ( λ ex = 365 nm), separately. Furthermore, all the complexes show different luminescence signal changes towards aromatic volatile organic compounds (AVOCs). Complex 1 exhibits a high sensitivity in the detection of both Fe 3+ and Cr 3+ with large quenching coefficients of K sv 2.57 × 10 4 M −1 and 2.96 × 10 4 M −1 , respectively. All these results demonstrated potential applications in chemical sensing. Three new LMOFs, complexes 1-3 , have been solvothermally synthesized. 1 and 2 are 2-D structures, whiles 3 is a 3-D structure. And 1 exhibits in detecting Fe 3+ and Cr 3+ . All of them have potential applications in chemical sensing.