Self-Assembly of Triangular and Hexagonal Molecular Necklaces

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• 作者：Shijun Li ; Jianying Huang ; Fengyan Zhou ; Timothy R. Cook ; Xuzhou Yan ; Yang Ye ; Bin Zhu ; Bo Zheng ; Peter J. Stang
• 刊名：Journal of the American Chemical Society
• 出版年：2014
• 出版时间：April 23, 2014
• 年：2014
• 卷：136
• 期：16
• 页码：5908-5911
• 全文大小：302K
• 年卷期：v.136,no.16(April 23, 2014)
• ISSN：1520-5126

文摘

The formation of catenated systems can be simplified greatly if one or more rings are generated via self-assembly. Herein we exploit the orthogonality of coordination-driven self-assembly and crown-ether host鈥揼uest complexation to obtain a [4]molecular necklace and a [7]molecular necklace based on a well-developed recognition motif of 1,2-bis(pyridinium)ethane/dibenzo[24]crown-8. By adapting the bis(pyridinium) motif into the backbone of a donor building block, the resulting semirigid dipyridyl species can serve both as a structural element in the formation of metallacycles and as a site for subsequent host鈥揼uest chemistry. The pseudolinear nature of the donor precursor lends itself to the formation of triangular and hexagonal central metallacycles based on the complementary acceptor unit used. This exemplary system organizes up to 18 molecules from three unique species in solution to afford a single supramolecular ensemble.