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Adaptive self-assembly and induced-fit transformations of anion-binding metal-organic macrocycles.


ABSTRACT: Container-molecules are attractive to chemists due to their unique structural characteristics comparable to enzymes and receptors in nature. We report here a family of artificial self-assembled macrocyclic containers that feature induced-fit transformations in response to different anionic guests. Five metal-organic macrocycles with empirical formula of MnL2n (M=Metal; L=Ligand; n=3, 4, 5, 6, 7) are selectively obtained starting from one simple benzimidazole-based ligand and square-planar palladium(II) ions, either by direct anion-adaptive self-assembly or induced-fit transformations. Hydrogen-bonding interactions between the inner surface of the macrocycles and the anionic guests dictate the shape and size of the product. A comprehensive induced-fit transformation map across all the MnL2n species is drawn, with a representative reconstitution process from Pd7L14 to Pd3L6 traced in detail, revealing a gradual ring-shrinking mechanism. We envisage that these macrocyclic molecules with adjustable well-defined hydrogen-bonding pockets will find wide applications in molecular sensing or catalysis.

SUBMITTER: Zhang T 

PROVIDER: S-EPMC5481752 | biostudies-literature | 2017 Jun

REPOSITORIES: biostudies-literature

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Adaptive self-assembly and induced-fit transformations of anion-binding metal-organic macrocycles.

Zhang Ting T   Zhou Li-Peng LP   Guo Xiao-Qing XQ   Cai Li-Xuan LX   Sun Qing-Fu QF  

Nature communications 20170616


Container-molecules are attractive to chemists due to their unique structural characteristics comparable to enzymes and receptors in nature. We report here a family of artificial self-assembled macrocyclic containers that feature induced-fit transformations in response to different anionic guests. Five metal-organic macrocycles with empirical formula of M<sub>n</sub>L<sub>2n</sub> (M=Metal; L=Ligand; n=3, 4, 5, 6, 7) are selectively obtained starting from one simple benzimidazole-based ligand an  ...[more]

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