Polymer-Grafted Cu(II) Metal-Organic Polyhedra as Scalable, Melt-Processable Porous Materials

The development of porous materials that combine low-temperature meltability with high gas uptake remains a major challenge. Herein, we report Cu-BCN-5, a polymer-grafted Cu(II) metal-organic polyhedron (MOP), as a scalable melt-processable material with intrinsic porosity. This material melts at 44°C while preserving cage integrity and accessible porosity. By overcoming diffusion limitations imposed by the polymer corona during sorption measurements, the material reaches a CO₂ uptake of 0.68 mmol g^-1 at 298 K and 1 bar, the highest value reported for melt-processable porous materials under these conditions. Furthermore, the molten state enables fabrication of dense, grain-boundary-free macroscopic objects that retain high adsorption performance after shaping. These results establish Cu(II)-based MOPs as a scalable platform for melt-processable porous materials.