The Cucurbit[n]uril Family:  Prime Components for Self-Sorting Systems

Simin Liu, Christian Ruspic, Pritam Mukhopadhyay, Sriparna Chakrabarti, Peter Y. Zavalij & Lyle Isaacs
We determined the values of Ka for a wide range of host−guest complexes of cucurbit[n]uril (CB[n]), where n = 6−8, using 1H NMR competition experiments referenced to absolute binding constants measured by UV/vis titration. We find that the larger homologuesCB[7] and CB[8]individually maintain the size, shape, and functional group selectivity that typifies the recognition behavior of CB[6]. The cavity of CB[7] is found to effectively host trimethylsilyl groups. Remarkably, the values of Ka for the...
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