Guest packing motifs within a supramolecular nanocapsule and a covalent analogue.

Guest packing motifs within a supramolecular nanocapsule and a covalent analogue.
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DOI:
10.1021/ja310741q
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发表时间:
2013-03-20
影响因子:
15
通讯作者:
Gibb, Bruce C.
Gibb, Bruce C.
中科院分区:
化学1区
文献类型:
--
作者:
Liu, Simin;Russell, David H.;Zinnel, Nathanael F.;Gibb, Bruce C.

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研究了两种利用疏水效应组装和/或封装客体分子的宿主。八羧酸(OA)和己烯二胺连接的八羧酸(HOA)可以络合多种正构烷烃,直至正己烷(C26H54)。1H NMR、NMR扩散、COSY和NOESY实验的组合揭示了四种不同的客体包装基序,这取决于客体的大小和宿主的性质。作为来宾大小的函数,从一个主题到下一个主题的平滑过渡被观察到,并允许其相对稳定性的资格。此外,尽管两种寄主产生表面上相同的封装环境,但它们不同的组装特性导致了相当不同的包装基序概况,即基序如何随着来宾尺寸的变化而变化。
Two hosts that utilize the hydrophobic effect to assemble and/or encapsulate guest molecules were studied. The hosts, octa-acid (OA) and hexalene diamine-linked octa-acid (HOA) were shown to complex a broad range of n-alkanes up to n-hexacosane (C26H54). A combination of 1H NMR, NMR diffusion, COSY, and NOESY experiments revealed four different guest packing motifs, depending on the size of the guest and the nature of the host. As a function of guest size, smooth transitions from one motif to the next were observed and allowed qualification of their relative stabilities. Furthermore, although the two hosts engender ostensibly identical encapsulation environments, their different assembly properties lead to quite distinct packing-motif profiles, i.e., how the motifs change as a function of guest size.
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