Abstract
Owing to their permanent porosity, tunability and multifunctionalization, metal-organic framework (MOF) materials have captured widespread interest in various fields, including gas storage and separation, catalysis, and energy storage. However, precise control over the composition, structure and properties of MOF materials remains a generally elusive but worthwhile dream. The stepwise assembly of porous crystalline MOF materials provides possibility to access this goal. In this review, we focus on four kinds of mixed-linker MOFs, (i) pillared-layer mixed-linker MOFs, (ii) cage-directed mixed-linker MOFs, (iii) cluster-based mixed-linker MOFs, and (iv) structure templated mixed-linker MOFs. The achieved progress and existing problems are discussed, and the opportunities and challenges of mixed-linker MOFs and their related applications are anticipated.