A zinc boron-oxo cluster-based structure (Zn2 (μ2-OH) (Dmg) 4B3O3 (OH) B6O7 (OH) 2, BOC-23) was synthesized solvothermally using a dioxime (DmgH2) ligand. Two polyboroxole units (B3O7 (OH) and B6O11 (OH) 2) are linked to Dmg via oxygen-sharing, forming an organic-inorganic hybrid macrocyclic cluster coordinating two Zn2+ ions. Peripheral hydroxyl groups of the cluster facilitate the formation of a 3D hydrogen-bonded network in BOC-23 through intermolecular O-H···O interactions, forming a rigid framework that enhances stability and modulates guest luminescence via confinement. Systematic studies on host-guest interactions via in situ encapsulation of distinct luminescent guests reveal luminescence tuning from blue to cyan and red, alongside distinct synergistic luminescence enhancement in specific host-guest pairs. Notably, BOC-23 is a crystalline boron-oxo cluster host that enables in situ encapsulation of multiple luminescent guests─a feature not observed in prior boron-oxo clusters. This capability is exemplified by DEAC@BOC-23, which exhibits a quantum yield of 18. 8% and a lifetime of 2. 99 ns, representing 25 times and 6 times enhancements over pristine DEAC, respectively.
Zhao et al. (Mon,) studied this question.