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Improved thermal stability of an organic zeolite by fluorination |
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| Authors: | Katharina Reichenbächer Gaëtan Couderc Antonia Neels Karl Krämer Edwin Weber Jürg Hulliger |
| Institution: | 1. Departement of Chemistry and Biochemistry, University of Berne, Freiestrasse 3, 3012, Berne, Switzerland 2. Institute of Microtechnology, University of Neuchatel, Jacquet Droz 1, 2002, Neuchatel, Switzerland 3. Institute of Organic Chemistry, TU Bergakademie Freiberg, Leipziger Str. 29, 09596, Freiberg/Sachsen, Germany |
| Abstract: | The thermal stability of an organic zeolite material, namely 2,4,6-tris(4-bromo-3,5-difluorphenoxy)-1,3,5-triazin (Br-3,5-DFPOT), was improved by fluorination of 2,4,6-tris(4-bromophenoxy)-1,3,5-triazin (BrPOT). The open pore structure (van der Waals diameter of 10.5 Å) of the modified zeolite was observed up to 110 °C in comparison to 70 °C for BrPOT. Nitrogen sorption at low temperature showed a type I isotherm and derived pore volumes thereof are in agreement with structural data. It was observed here that Br-3,5-DFPOT crystals preserving the open pore structure could only be obtained below a typical size of about 50 μm. The improved thermal stability of the fluorinated system is attributed to an enhancement of the strength of the Br3-synthon. |
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