Angle-Dependent Polarized Emission and Photoelectron\nPerformance of Dye-Encapsulated Metal–Organic Framework

Abstract

Molecule-based\ncrystalline materials with angle-dependent polarized\nemission have attracted considerable attention owing to their extensive\napplications in displays and anticounterfeiting. Herein, one anionic\nmetal–organic framework (MOF) {[Zn_2.5(μ₃-OH)­(NDC)₂(HNDC)]­(HPIM)}<i>_n</i> was constructed on the basis of an excellent photoactive ligand\nnaphthalene-1,4-dicarboxylic acid (H₂NDC). The protonated\n2-propylimidazole (HPIM) guests residing in the nanochannels of MOF\ncan be exchanged by a D-π-A cationic dye. The resulted host–guest\nsystem shows a rare example of ratiometric fluorescent polarizations\nand highly enhanced photoelectron performance in comparison with the\npristine MOF.