4-tert-butylcalix[4]arene-based porous structures
| 23.08.2018, 10:53 | |
Solvates of simple calixarenes are among a few examples that do not follow this trend. The desolvation of calixarenes under controlled conditions allows us to obtain a crystalline material with an active porous phase that absorbs gases under normal conditions. In this research, the effect of polymorphism in the formation and thermal decomposition of the 4-tert- butylcalix[4]arene complex with acetonitrile (tBC-AN) on the formation of microporous structures characterized by substantial surface area and narrow pore size distribution was investigated. The following experimental methods were used in the study: X-ray, differential scanning calorimetry and thermogravimetric analysis. Besides, a specific surface area and pore size analyzer (NOVA 1200 Series Quantachrome) was used to determine the porosity and surface area of 4-tert-butylcalix[4]arene samples. Thus, the microporous structure of the obtained material was revealed to be dependable upon the following conditions. 0. The possibility of keeping a tetragonal structure in a partially desolvated tBC-AN complex. 1. The presence of external molecular cavities binding adjacent tBC molecules in columns and layers. 2. The cooperative rotation of tert-butyl groups around C(ar)-C(sp3) bond. It promotes the diffusion of solvent or gas molecules through a nonporous molecular crystal matrix moving from the internal cavity of calixarene to its external cavity. 3. The presence of micropores that appear at the interface of two phases in a hybrid organic crystal and play the role of transport channels upon adsorption. Plevina E. V. | |
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