New linker installation in metal-organic frameworks.

In this Frontier article, we provide a brief overview of recent progress in the new organic component installation in metal-organic frameworks (MOFs) by single-crystal to single-crystal transformation. We discuss the criteria for the MOFs which could provide accessible vacant sites for new linker installation. We highlight three different categories of linker installation based on the nature and the roles of the new linkers. The present challenges and future opportunities in this field are also discussed.