A Precise Microreactor for Ultralong Visible Chemiluminescence

Chemiluminescence microreactors (CLMR) integrate catalytic centers, luminescent centers, and open channels into an atomic-scale platform, which can provide significantly enhanced light emission compared with usual homogeneous solvent systems. Herein, we report a novel metal–organic framework (MOF), UPC-88, which is constructed by a lophinyl-functionalized H₄L^IM-2H ligand (4,4′,4″,4‴-((naphthalene-1,4-diylbis(4,1-phenylene))bis(1H-imidazole-2,4,5-triyl))tetrabenzoic acid) with the first double (metal/organic) H₂O₂ catalytic center for CLMR. Due to the fixed chromophore and integrated dual catalytic sites, the relaxation phenomenon is greatly reduced and the energy transfer efficiency is significantly improved, resulting in the outstanding light emission performance of UPC-88. The visible luminous time of the UPC-88 system up to 1100 min was recorded as one of the highest ever reported for MOF systems. We linearly fitted the fluorescence intensity and fluorescence power for the first time, and the results show that UPC-88 is the MOF chemiluminescent material with the highest fluorescence power reported so far. The exploration of the CL reaction mechanism reveals the key role of the lophine base center in the decomposition of hydrogen peroxide, enabling the efficient conversion of chemical energy to light energy. This platform will provide a theoretical and experimental basis for next-generation CLMR systems and improved CL performance.