2-Iodo-imidazolium receptor binds oxoanions via charge-assisted halogen bonding
- 22 November 2011
- journal article
- research article
- Published by Royal Society of Chemistry (RSC) in Organic & Biomolecular Chemistry
- Vol. 10 (7) , 1329-1333
Abstract
A detailed 1H-NMR study of the anion binding properties of the 2-iodo-imidazolium receptor 1 in DMSO allows to fully attribute the observed affinities to strong charge-assisted C–I⋯X−halogen bonding (XB). Stronger binding was observed for oxoanions over halides. Phosphate, in particular, binds to 1 with an association constant of ca. 103 M−1, which is particularly high for a single X-bond. A remarkably short C–I⋯O− contact is observed in the structure of the salt 1·H2PO4 −.Keywords
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