The complexation of halide ions by a calix[6]pyrrole
- 15 June 2000
- journal article
- research article
- Published by Royal Society of Chemistry (RSC) in Chemical Communications
- No. 13,p. 1207-1208
- https://doi.org/10.1039/b002239j
Abstract
The X-ray crystal structures of the 1∶1 complexes formed by calix[6]pyrrole 1b with Bun 4NCl and Bun 4NBr show the macrocycle to adopt D3d symmetry and to encapsulate the halide ions within the macroring cavity via six N–H···X– hydrogen bonds; the macrocycle subtly adjusts its conformation to accommodate the differently sized anions; preliminary extraction experiments indicate that 1b is a dramatically stronger chloride ion complexing agent than its smaller analogue calix[4]pyrrole 1a.Keywords
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