Versatile and Efficient Mechanochemical Synthesis of Crystalline Guest⊂Zeolitic Imidazolate Framework Complexes by in Situ Host−Guest Nanoconfinement - 主-客体和超分子化学

In this work, the one-pot mechanochemical synthesis has been demonstrated to be a versatile and efficient method to prepare hybrid guestZIF materials with high crystallinity, and up to 18 functional guest molecules with different sizes, shapes and properties have been encapsulated into interior cavities of ZIFs with high guest loading. These guest molecules can be accommodated within the different cavities of sod- or rho-ZIFs, depending on the sizes of guest. Because of the relatively small opening of ZIFs, the guest molecules can be immobilized by physical imprisonment and cannot be released without destroying the host matrix. More importantly, the obtained guestZIF materials have been endowed with various interesting properties originated from the encaged guest molecules, which significantly extends the functionality of MOFs. For instance, PEG-decorated nanoparticles of a sod-ZIF (i.e. ZIF-8) encapsulating gadolinium complex exhibit interesting property of magnetic resonance imaging (MRI) and a rho-ZIF (i.e. MAF-6) with metalloporphyrin embedded can be used as an effective heterogeneous catalyst for epoxidation of styrene.