Improved thermal stability of an organic zeolite by fluorination

Reichenbächer, Katharina; Couderc, Gaëtan; Neels, Antonia; Krämer, Karl; Weber, Edwin; Hulliger, Jürg

doi:10.1007/s10847-007-9404-2

Cited by 9 publications

(5 citation statements)

References 21 publications

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“…50 However, issues of stability occur often which are limiting the use in many functional applications. Reichenba¨cher et al 51 have recently shown that the selective fluorination of an organic zeolite can improve thermal stability significantly. For the 2,4,6-tris-(4-bromo-3,5-difluorophenoxy)-1,3,5-triazine (26), which is a fluorinated analog of the well known host 2,4,6-tris(4-bromophenoxy)-1,3,5-triazine (27), the open pore structure could be maintained up to a temperature of 110 1C in contrast to only 70 1C for the non-fluorinated parent compound.…”

Section: Inclusion Compoundsmentioning

confidence: 99%

Organic fluorine compounds: a great opportunity for enhanced materials properties

et al. 2011

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Interactions of "organic fluorine" have gained great interest not only in the context of crystal engineering, but also in the systematic design of functional materials. The first part of this tutorial review presents an overview on interactions known by organic fluorine. This involves π-π(F), C-F···H, F···F, C-F···π(F), C-F···π, C-F···M(+), C-F···C=O and anion-π(F) interactions, as well as other halogen bonds. The effect of the exchange of H vs. F is discussed by means of several examples and a short introduction to the young field of "fluorous" chemistry is given. The second part is dedicated to numerous applications of fluorine and fluorous interactions. It is shown how application of fluorination is used to enable a number of reactions, to improve materials properties and even open up new fields of research.

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Section: Inclusion Compoundsmentioning

confidence: 99%

Organic fluorine compounds: a great opportunity for enhanced materials properties

et al. 2011

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“…89 Other dipeptides crystallise with much larger channels, for example, those of L-phenylalanyl-L-phenylalanine are $10 A in diameter, but these have not been shown to possess permanent porosity to date. 123 Other nanoporous molecular crystals with 1-dimensional channels include the unsolvated crystals derived from the natural product 2,2 0 -bis-(formyl-1,6,7-trihydroxy-5-isopropyl-3-methylnaphthalene (Gossypol) 9, which has been shown to adsorb gases (CO 2 ) 93 and vapours (e.g., I 2 and NH 3 ); 92,127 2,4,6-tris(4-bromophenoxy)1,3-triazine (BrPOT) 10, which contains large channels (diameter ¼ 12 A) and adsorbs N 2 at 77 K, although the isotherm has a non-conventional appearance; 95,96 and the 1-D channel-containing inclusion compounds formed by the muchstudied host, 2,6-dimethylbicyclo[3.3.1]nonane-exo-2,exo-6diol, 128 which shows convincing evidence of stability when unsolvated, however, this has not been confirmed by gas adsorption. 129 A number of macrocycles align within crystals to give NMCs with 1-D channels, sometimes termed 'supramolecular nanotubes'.…”

Section: Molecular Nanoporous Crystals With 1-d Channelsmentioning

confidence: 99%

Nanoporous molecular crystals

2010

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Nanoporous Molecular Crystals (NMCs) are nanoporous materials composed of discrete molecules between which there are only non-covalent interactions-i.e. they do not possess an extended framework composed of covalent or coordination bonds. They are formed from removing guest molecules from inclusion compounds (ICs) a process that for most ICs usually results in the collapse of the open structure of the crystals but in the case of NMCs the packing of the host molecules is retained and nanoporosity obtained. In recent years a number of NMCs have been confirmed by the technique of gas adsorption and these materials are surveyed in this feature article. In addition, the reasons for stability of these crystals are discussed. It is the author's belief that many more ICs, the structures of which are readily obtainable from the Cambridge Structural Database (CSD), may act as precursors to NMCs.

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“…162,163 It is often the case that hydrogen bonds help form a two-dimensional lattice, which forms the three dimensional crystal structure through stacking promoted by p-p interactions. 90,101 Also very frequent are p-halogen 65,105,[164][165][166] and full-halogen 102,103 synthons, such as the ones present on the structure shown in Fig. 3.…”

Section: Organic Supramolecular Microporous Solidsmentioning

confidence: 99%

Peptide-based solids: porosity and zeolitic behavior

2012

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Among the greatest challenges in the field of microporous solids is the development of ''smart'' materials, displaying environment-triggered property tuning. These could be used both in traditional and new applications of microporous materials. In this context, supramolecular peptide-based solids have recently emerged as interesting alternatives to standard microporous solids, such as zeolites and carbon molecular sieves. They possess framework and conformational flexibility, are kinetically stable and reasonably thermally resistant. Important properties such as pore size and inner wall chemistry can be controlled through appropriate chemical modification of the peptide molecules. Peptide-based porous solids have permanent microporosity, often with molecularly sized cavities created by removal of co-crystallised solvent. Some have already been successfully tested as adsorbents and permselective materials, confirming their potential. This review covers the identification, synthesis, characterization techniques and properties of peptide-based microporous solids, discussing their most unique functionalities.

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Improved thermal stability of an organic zeolite by fluorination

Cited by 9 publications

References 21 publications

Organic fluorine compounds: a great opportunity for enhanced materials properties

Organic fluorine compounds: a great opportunity for enhanced materials properties

Nanoporous molecular crystals

Peptide-based solids: porosity and zeolitic behavior

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