Separation of asymmetrically capped double-decker silsesquioxanes mixtures
| Autor: | Andre Lee, Jonathan E. Dannatt, David F. Vogelsang, Robert E. Maleczka |
|---|---|
| Rok vydání: | 2018 |
| Předmět: |
Steric effects
Chemistry 02 engineering and technology 010402 general chemistry 021001 nanoscience & nanotechnology 01 natural sciences High-performance liquid chromatography 0104 chemical sciences Inorganic Chemistry Silanol chemistry.chemical_compound Trichlorosilane Polymer chemistry Materials Chemistry Physical and Theoretical Chemistry 0210 nano-technology Trend estimation Double decker |
| Zdroj: | Polyhedron. 155:189-193 |
| ISSN: | 0277-5387 |
| DOI: | 10.1016/j.poly.2018.08.016 |
| Popis: | A synthetic path to asymmetric side-capped double-decker shaped silsesquioxanes (DDSQ) and subsequent isolation is described. By strategically using a combination of dichloro and trichlorosilane capping agents, a resultant product with mixed silanol functionalities was obtained. The use of preparatory liquid chromatography (LC) cleanly separated DDSQ compound with asymmetric functionality, and HPLC provided a quantitative technique to analyze mixture ratios. These mixture ratios did not follow the expected statistical trend due to the steric effects on the rate of capping. As a consequence, a decreased amount of the desired asymmetric DDSQ was observed in some cases. This was overcome by varying the ratio of capping agents. Overall, this work demonstrates access to asymmetric DDSQ cages is feasible, and LC is an effective separation technique. |
| Databáze: | OpenAIRE |
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