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 pyrenebased MOFs. Herein, we report the synthesis of a 2D anionic pyrene-based MOF [BMI](2)[Mg3(TBAPy)(2)(mu(2)-OH2)(2)(H2O)(2)]center dot 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.

Automated summary

Interchromophoric interactions are crucial for the development of unique optoelectronic functionalities in pyrene-based MOFs. In this study, a 2D anionic pyrene-based MOF was synthesized and its photoelectric conversion performance was investigated through the encapsulation of cation dyes. The results showed that the encapsulation of dyes could significantly enhance the absorption range and improve the photoelectric conversion performance of the MOF.