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Prof. Roger Alberto, Dr. Greta Bergamaschi, Dr. Henrik Braband, Dr. Thomas Fox and Dr. Valeria Amendola 99TcO4−: Selective Recognition and Trapping in Aqueous Solution Angewandte Chemie International Edition 51

Version of Record online: 15 AUG 2012 | DOI: 10.1002/anie.201205313

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Too hot to handle: Unprecedented affinity and specificity for 99TcO4 in aqueous solution was shown with the p-xylyl azacryptand in the hexaprotonated form (see scheme). A crystal structure of the complex reveals how the anion fits within the cavity of the cage, and the formation of multiple H-bond interactions with protonated amino groups stabilize the adduct.

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