Senkovska Irena, Bon Volodymyr, Mosberger Antonia, Wang Yutong, Kaskel Stefan
Chair of Inorganic Chemistry I, Technische Universität Dresden, Bergstrasse 66, 01069, Dresden, Germany.
Adv Mater. 2025 Jan 28:e2414724. doi: 10.1002/adma.202414724.
Flexible metal-organic frameworks (MOFs) offer unique opportunities due to their dynamic structural adaptability. This review explores the impact of flexibility on gas adsorption, highlighting key concepts for gas storage and separation. Specific examples demonstrate the principal effectiveness of flexible frameworks in enhancing gas uptake and working capacity. Additionally, mixed gas adsorption and separation of mixtures are reviewed, showcasing their potential in selective gas separation. The review also discusses the critical role of the single gas isotherms analysis and adsorption conditions in designing separation experiments. Advanced combined characterization techniques are crucial for understanding the behavior of flexible MOFs, including monitoring of phase transitions, framework-guest and guest-guest interactions. Key challenges in the practical application of flexible adsorbents are addressed, such as the kinetics of switching, volume change, and potential crystal damage during phase transitions. Furthermore, the effects of additives and shaping on flexibility and the "slipping off effect" are discussed. Finally, the benefits of phase transitions beyond improved working capacity and selectivity are outlined, with a particular focus on the advantages of intrinsic thermal management. This review highlights the potential and challenges of using flexible MOFs in gas storage and separation technologies, offering insights for future research and application.
柔性金属有机框架材料（MOFs）因其动态结构适应性而提供了独特的机遇。本综述探讨了柔性对气体吸附的影响，突出了气体储存和分离的关键概念。具体实例展示了柔性框架材料在提高气体吸收量和工作容量方面的主要成效。此外，还综述了混合气体吸附以及混合物的分离，展示了它们在选择性气体分离方面的潜力。该综述还讨论了单一气体等温线分析和吸附条件在设计分离实验中的关键作用。先进的联合表征技术对于理解柔性MOFs的行为至关重要，包括监测相变、框架 - 客体和客体 - 客体相互作用。文中探讨了柔性吸附剂实际应用中的关键挑战，如转变动力学、体积变化以及相变过程中潜在的晶体损伤。此外，还讨论了添加剂和成型对柔性以及“滑脱效应”的影响。最后，概述了相变除了提高工作容量和选择性之外的益处，特别关注固有热管理的优势。本综述突出了在气体储存和分离技术中使用柔性MOFs的潜力和挑战，为未来的研究和应用提供了见解。
