科研之友
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摘要
An iminium dication 1 was designed as a high-affinity and easily removable guest for cucurbit[7]uril (CB[7]). X-ray crystallographic analysis shows that maximized N+center dot center dot center dot O=C ion-dipole interactions and perfect packing coefficient are responsible for the high affinity of 1 for CB[7] (K-a > 10(11) M-1). Under alkaline conditions, included 1 in CB[7]center dot 1 is hydrolyzed into 2,6-adamantanedione and pyrrolidine that can be fully removed by further extraction, enabling the recycling of CB[7] materials.
