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Ten physisorbent materials were evaluated in this study. Elements C, O, N, Si, F, Cu, Cr, Ni, Mo, Zn and Zr are represented by grey, red, blue, yellow, pink, salmon, dark red, sky blue, orange, brown and purple, respectively; H atoms have been omitted for clarity. The dark green net represents the second interpenetrated network in SIFSIX-2-Cu-i and DICRO-3-Ni-i.
