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Rotaxane-mediated suppression and activation of cucurbit[6]uril for molecular detection by (129)Xe hyperCEST NMR
Joel A Finbloom1, Clancy C Slack2, Carson J Bruns1
1Department of Chemistry, University of California, Berkeley, Berkeley, CA 94720, USA.
Abstract:
We report a method for blocking interactions between (129)Xe and cucurbit[6]uril (CB6) until activation by a specific chemical event. We synthesized a CB6-rotaxane that allowed no (129)Xe interaction with the CB6 macrocycle component until a cleavage event released the CB6, which then produced a (129)Xe@CB6 NMR signal. This contrast-upon-activation (129)Xe NMR platform allows for modular synthesis and can be expanded to applications in detection and disease imaging.
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