Th 2025 Nobel Prize for chemistry has been awarded to Susumu Kitagawa, Richard Robson and Omar M. Yaghi for the development of a new type of molecular architecture. The constructions they created – metal-organic frameworks (MOFs) – contain large cavities in which molecules can flow in and out. MOFs can be used for gas separation and hydrogen storage – only two applications among many for which the Hartmann Research Group at our Department has been preparing and characterizing these frameworks for the past 20 years.