Dynamics of a supramolecular capsule assembly with pyrene.

Dynamics of a supramolecular capsule assembly with pyrene.
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DOI:
10.1021/ja301278p
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发表时间:
2012-03-28
影响因子:
15
通讯作者:
Bohne, Cornelia
Bohne, Cornelia
中科院分区:
化学1区
文献类型:
--
作者:
Tang, Hao;de Oliveira, Carla Santos;Sonntag, Gage;Gibb, Corinne L. D.;Gibb, Bruce C.;Bohne, Cornelia

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水溶性八酸空穴配体(OA)形成适合于客体掺入的二聚胶囊。我们的研究表明,芘(Py)的结合机制如下的快速(< 1 ms)形成的Py·OA复合物,其次是缓慢的结合与第二OA。胶囊OA·Py·OA复合物的解离发生在2.7秒的寿命内,这比先前观察到的微秒级打开-关闭(“呼吸”)慢五个数量级,以提供小分子进入封装的客体。胶囊的这些不同动力学对如何改变所包含的客人的化学性质具有潜在影响。
Water-soluble octa-acid cavitands (OA) form dimeric capsules suitable for guest incorporation. Our studies reveal that the mechanism of pyrene (Py) binding follows the rapid (< 1 ms) formation of the Py•OA complex, followed by slower binding with the second OA. The dissociation of the capsular OA•Py•OA complex occurs with a lifetime of 2.7 s, which is five orders of magnitude slower than the microsecond opening-closing (`breathing') previously observed to provide access of small molecules to the encapsulated guest. These different dynamics of the capsules have a potential impact on how the chemistry of included guests could be altered.
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