Solvent-free Synthesis of Multi-Module Pore-Space-Partitioned Metal-Organic Frameworks for Gas Separation

Multi-module design of framework materials with multiple distinct building blocks has attracted much attention because such materials are more amenable to compositional and geometrical tuning and thus offer more opportunities for property optimization. Few examples are known that use environmentally friendly and cost-effective solvent-free method to synthesize such materials. Here, we report the use of solvent-free method (also modulator-free) to synthesize a series of multi-module MOFs with high stability and separation property for C2H2/CO2. The synthesis only requires simple mixing of reactants and short reaction time (2 h). Highly porous and stable materials can be made without any post-synthetic activation. The success of solvent-free synthesis of multi-module MOFs reflects the synergy between different modules, resulting in stable pore-partitioned materials, despite the fact that other competitive crystallization pathways with simpler framework compositions also exist.

Automated summary

The multi-module design of framework materials has gained attention due to its potential for compositional and geometrical tuning. However, environmentally friendly and cost-effective methods for synthesizing such materials are rare. In this study, we demonstrate a solvent-free method for synthesizing multi-module MOFs with high stability and separation properties. The method involves simple mixing of reactants and short reaction time, resulting in highly porous and stable materials without the need for post-synthetic activation. The success of this solvent-free synthesis reflects the synergy between different modules, even in the presence of simpler framework compositions.