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超级雪花:罗姆布星状超分子的逐步自组和动态交换

Zhe Zhang^1,2, Heng Wang², Xu Wang³

¹Key Laboratory of Pesticide & Chemical Biology, Ministry of Education, School of Chemistry, Central China Normal University , Wuhan, Hubei 430079, China.

Journal of the American Chemical Society

|May 31, 2017

概括

研究人员设计了复杂的,星形的金属超分子, 这种方法确保了巨型结构的形成,防止了不必要的小组件,并显示出了显著的稳定性.

科学领域:

超分子化学
协调化学
材料科学

背景情况:

金属超分子化学旨在创建复杂的结构.
逐步组装策略对于控制自组装过程至关重要.
2,2':6',2′′-特皮里丁 (tpy) 连接体是超分子化学中的多功能构建块.

研究的目的:

设计和组装新的,复杂的,星形超分子结构 (超级雪花).
研究逐步组装和金属离子协调在控制自组装中的作用.
为了证明由此产生的超级雪花的稳定性.

主要方法:

逐步自组装使用ditotic,tritopic和hexatopic 2,2':6',2′′-terpyridine (tpy) 连接体.
与 (Ru) (II) 结合,形成稳定的金属有机.
随后与 (Zn) 离子进行自组,形成巨大的异构结构.
核磁共振 (NMR) 和质谱用于动态交换研究.

主要成果:

设计成功,并逐步组装两个星形的超级雪花.
形成含有3个tpy连接体和2个金属离子 (Ru (II) 和 Zn (II)) 的巨型异体积超级雪花.
防止不必要的自我分类到小型宏循环和协调聚合物.
证明组装的超级雪花具有显著的分子内和分子间稳定性.

结论:

一个逐步的自组装策略是有效的构建复杂的金属-超分子架构.
稳定的Ru(II) -有机配体和不稳定的Zn(II) 离子的组合促进了巨大的异质超级雪花的形成.
由此产生的超级雪花具有很高的稳定性,这是动态交换研究所证实的.

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