Polyhedral Oligomeric Silsesquioxane

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 I 2  vapor. For PSIF-1a I 2 uptake of 481%wt was obtained, which is the highest value reported to date. Preferential interaction of I 2  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

The simplest method of preparing amides is by reacting the amines with carboxylic acids (for example in the presence of DCC as a coupling agent), acid anhydrides, esters or acyl halides. In the work by Janeta et all ( Chemistry - A European Journal 2014, 20, 15966-15974 ), the reactions were carried out with the use of acid chlorides, which were selected because these reactions do not require an additional coupling agent, the reaction is rapid even at reduced temperature, and the resulting by-product (ammonium salt) is easy to remove. The reaction of amines with acid chlorides, the products of which are amides (Schotten-Baumann reaction), is usually carried out in a two-phase system. The alkaline aqueous phase containing sodium hydroxide neutralizes the acid ammonium salt and the product remains in the organic phase. However, as under these conditions the silsesquioxane core decomposes (a strong base breaks the Si–O–Si bonds), the solution was to use triethylamine as a neutralizing age...