Gas storage and separation in a water-stable [(Cu5BTT3)-B-I](4-) anion framework comprising a giant multi-prismatic nanoscale cage

A novel water-stable open poly-nuclear Cu(I)-based metal-organic framework, [NC2H8](4)Cu-5(BTT)(3)center dot xG (G = guest of DMA and H2O) (1), featuring a giant multi-prismatic nanoscale cage and high CO2/N-2 and CO2/H-2 sorption selectivities, was successfully assembled by using the nitrogen-rich ligand of 1,3,5-tris(2H-tetrazol-5-yl) benzene (H3BTT) to bridge two types of Cu-3 and Cu-2 clusters.