Control of random self-assembly of pyrogallol[4]arene-based nanocapsule or framework

Abstract The controlled self-assembly of discrete metal-organic nanocapsules (MONCs), and metal-organic frameworks (MOFs) based on the MONCs are achieved. Specifically, the solvothermal reaction of nickel nitrate hexahydrate and C-methylpyrogallol[4]arene in mixed DMF/MeOH solution leads to the unexpected form of discrete nickel-seamed hexameric pyrogallol[4]arene MONCs, and MONC-based three-dimensional (3D) MOF. Notably, the latter MOF is constructed from the aforementioned nickel-seamed MONC building blocks and formate linkers in-situ generated from the hydrolysis of DMF solvent. Interestingly, introducing pyridine and formic acid in the reaction conditions leads to the controlled assemblies of the discrete MONC and MONC-based 3D MOF structures. Moreover, the variable-temperature magnetic susceptibilities of both the abovementioned compounds have been investigated, indicating typical antiferromagnetic interactions between the metal centers.