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MOF Network Scaffold Engineering: Inducing Cd/Zn-Based MOF Structural Variations via Metal Nodes and Intermolecular
Zheng Wang1, Xiang-Qian Li1, Xin-Qi Chen1
1Key Laboratory of Chemical Additives for China National Light Industry, College of Chemistry and Chemical Engineering, Shaanxi University of Science and Technology, Xi'an 710021, China.
Abstract:
The framework assembly mode of metal-organic frameworks (MOFs) confers a high degree of tunability and facilitates their application in the field of long-persistent luminescence (LPL) like advanced displays and anticounterfeiting systems. In this study, a novel network scaffold engineering strategy was employed to regulate LPL in MOFs by manipulating metal nodes and intermolecular interactions. Using 2,3-pyridinedicarboxylic acid (H2L) as the ligand, four MOFs with distinct topologies are constructed by varying metal nodes (Cd2+ and Zn2+) and synthesis conditions. MOF-SW21 and MOF-SW24 feature Cd-based metal-chain SBUs, while MOF-SW22 and MOF-SW23 have Zn/Cd-based binuclear metal nodes SBUs. Systematic characterization reveals that adjusting metal node composition and intermolecular interaction strength within the MOF scaffold enables fine-tuning of phosphorescence lifetimes from 20.70 to 139.85 ms. Especially, MOF-SW24 exhibits the longest lifetime (>100 ms) under the combined influence of scaffold effects and noncovalent interactions. These MOFs exhibit temperature-dependent, excitation-dependent, and time-dependent multicolor LPL, highlighting the effectiveness of the network scaffold engineering strategy in the precise regulation of LPL.
