Improved thermal stability of an organic zeolite by fluorination

  • Katharina Reichenbächer
  • Gaëtan Couderc
  • Antonia Neels
  • Karl Krämer
  • Edwin Weber
  • Jürg Hulliger
Original Article

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.

Keywords

Fluorine bonds Host–guest system Organic zeolites Sorption isotherm 

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Copyright information

© Springer Science+Business Media B.V. 2007

Authors and Affiliations

  • Katharina Reichenbächer
    • 1
  • Gaëtan Couderc
    • 1
  • Antonia Neels
    • 2
  • Karl Krämer
    • 1
  • Edwin Weber
    • 3
  • Jürg Hulliger
    • 1
  1. 1.Departement of Chemistry and BiochemistryUniversity of BerneBerneSwitzerland
  2. 2.Institute of MicrotechnologyUniversity of NeuchâtelNeuchatelSwitzerland
  3. 3.Institute of Organic ChemistryTU Bergakademie FreibergFreiberg/SachsenGermany

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