A Halogen Bonding-Based Heteroditopic Receptor for Alkali Metal Halides
J. Am. Chem. Soc. 2005, 127(43), 14972
A. Mele, P. Metrangolo, H. Neukirch, T. Pilati, G. Resnati
Single-crystal X-ray structure of the tripodal receptor; H atoms are omitted for clarity. Color code: gray = C, red = O, green = F, blue = N, violet = I, orange = Na.
Single-crystal X-ray structure of the tripodal receptor; H atoms are omitted for clarity. Color code: gray = C, red = O, green = F, blue = N, violet = I, orange = Na.
ABSTRACT
A new heteroditopic receptor for alkali metal halides has been designed and synthetized. It is comprised of a well-established motif for cation binding and a motif for halogen bonding-based anion recognition processes. The single crystal X-ray structure of the complex between the heteroditopic receptor and sodium iodide is reported. Thanks to the cooperativity of metal coordination and the strong I-···I halogen bonding, the ion pair is fully separated. The boosting effect of the binding of the anion through halogen bonding on the coordination of the cation by the receptor has been proved also in solution by NMR experiments. The selectivity of the new heterotopic receptor towards different alkali metal halides has been tested by ESI mass experiments.