Topology- and Guest-Dependent Photoelectric Conversion of 2D Anionic Pyrene-Based Metal-Organic Framework

Interchromophoric interactions play a key role in the evolution of unusual optoelectronic functionalities of pyrene-based MOFs. Herein, we report the synthesis of a 2D anionic pyrene-based MOF [BMI](2)[Mg-3(TBAP gamma)(2) (mu(2)center dot OH2)(2)(H2O)(2)] dioxane (1) (H(4)TBAPy = 1,3,6,8-tetrakis(p-benzoic acid)pyrene, BMI = 1-butyl-3-methylimidazolium) under ionothermal conditions. Its topology- and guest-dependent photoelectric conversion performance was investigated by the encapsulation of cation dyes 4-[p-(dimethylamino)styryl]-1-methylpyridinium (DMASM) through ionic exchange. Meanwhile, comparisons of structure parameters and photoelectric conversion performance between 1 and the other isostructural Mg-TBAPy MOF (2) with different steric configuration, stacking mode, and the arrangement of the guest species were also conducted. The encapsulation of DMASM guests can largely broaden the absorption range, enhancing the photoelectric conversion performance in comparison to the original MOFs.