Tailor‐Made Pd<sub><i>n</i></sub>L<sub>2<i>n</i></sub> Metal‐Organic Cages through Covalent Post‐Synthetic Modification
Dong Luo, Zi‐Jun Yuan, Lin‐Jie Ping, Xiaowei Zhu, Ji Zheng, Chuang‐Wei Zhou, Xian‐Chao Zhou, Xian‐Chao Zhou, Xiao‐Ping Zhou, Xiao‐Ping Zhou, Dan Li
Abstract
Abstract Post‐synthetic modification (PSM) is an effective approach for the tailored functionalization of metal‐organic architectures, but its generalizability remains challenging. Herein we report a general covalent PSM strategy to functionalize Pd n L 2 n metal‐organic cages (MOCs, n =2, 12) through an efficient Diels–Alder cycloaddition between peripheral anthracene substituents and various functional motifs bearing a maleimide group. As expected, the solubility of functionalized Pd 12 L 24 in common solvents can be greatly improved. Interestingly, concentration‐dependent circular dichroism and aggregation‐induced emission are achieved with chiral binaphthol (BINOL)‐ and tetraphenylethylene‐modified Pd 12 L 24 , respectively. Furthermore, Pd 12 L 24 can be introduced with two different functional groups (e.g., chiral BINOL and achiral pyrene) through a step‐by‐step PSM route to obtain chirality‐induced circularly polarized luminescence. Moreover, similar results are readily observed with a smaller Pd 2 L 4 system.