Porous Silsesquioxane-Imine Frameworks (PSIF)

Porous Silsesquioxane-Imine Frameworks (PSIF) was designed and synthesized by imine condensation approach starting from octa(3-aminopropyl)silsesquioxane cage compound (OAS-POSS) and selected multitopic aldehydes. The resulting PSIFs possess 3D micro-mesoporous structures with permanent porosity and high thermal stability. These aerogels were tested in sorption of I₂ vapor. For PSIF-1a I₂ uptake of 481%wt was obtained, which is the highest value reported to date. Preferential interaction of I₂ with PSIFs can be attributed to the cooperative interactions of POSS cages and imine moieties in the porous framework.

Schematic representation of the synthesis of PSIF-1–5; bifunctional and trifunctional prolinkers used in the synthesis

ACS Appl. Mater. Interfaces 2018, 23, 19964-19973