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放出子 放出子

Edward J Dale1, Nicolaas A Vermeulen, Andy A Thomas

  • 1Department of Chemistry, Northwestern University , 2145 Sheridan Road, Evanston, Illinois 60208, United States.

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|June 27, 2014
PubMed
概括
此摘要是机器生成的。

这项研究引入了一种新型形宿主分子ExCage(6+),旨在与多环芳 (PAH) 形成高亲和度纳入复合体. 这项研究强调了该分子通过非共价相互作用选择性结合PAH的能力,为分子识别提供了洞察力.

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科学领域:

  • 超分子化学 超分子化学
  • 有机合成 有机合成
  • 主机和客人的化学反应

背景情况:

  • 带有面对面的单元的环氧具有与多环芳 (PAHs) 强烈的结合.
  • 像 [π···π] 堆叠和 [C-H···π] 相互作用这样的非共价相互作用是高结合亲和度的关键.

研究的目的:

  • 为了合成一种新的,三倍对称的,基于的扩展形宿主 (ExCage(6+)).
  • 调查ExCage ((6+) 与各种PAHs的结合亲缘关系和复合动态.

主要方法:

  • 模板导向的,催化剂辅助的ExCage ((6+) 主体分子的合成.
  • 异热定位热量计 (ITC) 用于测量宿主-PAH复合物的关联常数 (K(a)).
  • 动态 (1)H NMR光谱检测解复杂化障碍物和快速注射 (1)H NMR光谱检测复杂化障碍物.

主要成果:

  • ExCage(6+) 显示了对PAHs的高结合亲缘关系,关联常数范围从2.82 × 10(3) M(-1) 对于纳夫他林到5.5 × 10(6) M(-1) 对于烯.
  • 对较大的PAH (,,三烯,冠) 观察到解复杂化障碍的逐步增加,这表明复杂性稳定性得到了增强.
  • 动力学数据显示较小的PAH复合物更快,而热力学数据显示较大的PAH形成更强的复合物,挑战传统的分子识别模型.

结论:

  • ExCage ((6+) 主体有效地结合了一系列具有高亲和度和稳定的PAHs.
  • 该研究提供了关于宿主-客人复合的有价值的动力学和热力学数据,促进了对分子识别的理解.
  • 这些发现表明,对于较大的PAH,Rebek 55%溶液公式对分子识别变得不那么适用.