Anion exchange in the channels of a robust alkaline earth sulfonate coordination network

作者：Dalrymple SA; Shimizu GKH^*

来源：Chemistry - A European Journal, 2002, 8(13): 3010-3015.

DOI：10.1002/1521-3765(20020703)8:13<3010::AID-CHEM3010>3.0.CO;2-5

• alkaline earth
• coordination framework
• ion exchange
• sulfonate ligands
• supramolecular chemistry

The barium sulfonate network presented herein, {[Ba-2(L)(H2O)(5)]Cl}(x) (1), represents the first metal sulfonate compound to possess a cationic framework. The network is layered with channels between pillaring ligands in which chloride ions reside. Compound 1 contracts slightly upon dehydration but retains its overall structural motif to 420degreesC. Significantly, the chloride ions of the structure can be exchanged in 80% yield for fluoride ions in a facile manner. This exchange is quantified by elemental analyses, gravimetric determination, and F-19 NMR spectroscopy. Confirmation of retention of structure is provided by standardized powder X-ray diffraction experiments. This last point is notable as the F-analogue of the structure is not attainable by a direct synthesis. These results illustrate one of the hallmark features of supramolecular chemistry, that a robust and functional framework can result through cooperative interactions between more weakly interacting units.

• 出版日期2002-7-2