Tetrahedral crosslinking of dia-type nets into a zeolitic GIS-type framework for optimizing stability and gas sorption

Abstract

By using the net-to-net assembly strategy and HSAB interaction principle, a zeolitic metal–organic framework (FJI-Y3) with GIS topology is synthesized and derived from the tetrahedral crosslinking of interpenetrating dia nets. FJI-Y3 has a stable framework structure (at 280 °C) with an aperture of 6.7 Å and a high Cu⁺ density of 1.14 Cu⁺ nm⁻³. The activated sample FJI-Y3-ht exhibits very high D₂ (250.1 cm³ g⁻¹) and H₂ (232.5 cm³ g⁻¹) uptakes at 77 K and 1.06 Bar, as well as a C₂H₂ uptake of 147.8 cm³ cm⁻³ at 298 K and 1.06 bar. Furthermore, n-C₄H₁₀/i-C₄H₁₀ adsorption selectivity in excess of 84 for FJI-Y3-ht indicates its outstanding sieving properties for meeting the industrial challenge of n-C₄H₁₀/i-C₄H₁₀ separation.