2-Iodo-imidazolium receptor binds oxoanions via charge-assisted halogen bonding
Org. Biomol. Chem 2012, 10, 1329-1333
M. Cametti, K. Raatikainen, P. Metrangolo, T. Pilati, G. Terraneo, G. Resnati
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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?IX− 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?IO− contact is observed in the structure of the salt 1·H2PO4−.