Face-controlled chirality induction in octahedral thiacalixarenebased porous coordination cages
Résumé
Nanosized chiral octahedral M32 coordination cages were prepared via self-assembly of sulfonylcalix[4]arene tetranuclear M(II) clusters (M = Co, Ni) with enantiomerically-enriched linkers based on tris(dipyrrinato)cobalt(III) complexes, appended with peripherical carboxylic groups. Two pairs of enantiomers were obtained and unambigously characterized from a structural point of view, using single crystal X-ray diffraction. Chiral-HPLC was used to evidence the enantiomers. In the solid state, the compounds present intrinsic and extrinsic porosity: the intrinsic porosity is linked with the size of cages, that present an inner diameter of ca 19Å. The obtained solid-state supramolecular architectures demonstrated good performances as adsorbents for water and 2-butanol guest molecules