Molecular recognition by multiple metal coordination inside wavy-stacked macrocycles

Takashi Nakamura, Yuya Kaneko, Eiji Nishibori and Tatsuya Nabeshima ()
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Takashi Nakamura: University of Tsukuba
Yuya Kaneko: University of Tsukuba
Eiji Nishibori: University of Tsukuba
Tatsuya Nabeshima: University of Tsukuba

Nature Communications, 2017, vol. 8, issue 1, 1-7

Abstract: Abstract Most biological and synthetic receptors for small organic molecules employ a combination of relatively weak intermolecular interactions such as hydrogen bonds. A host compound that utilizes stronger yet reversible bonding in a synergistic manner could realize precise recognition, but the regulation and spatial arrangement of such reactive interaction moieties have been a challenge. Here, we show a multinuclear zinc complex synthesized from a macrocyclic ligand hexapap, which inwardly arranges labile metal coordination sites for external molecules. The metallomacrocycle forms a unique wavy-stacked structure upon binding a suitable length of dicarboxylic acids via multipoint coordination bonding. The saddle-shaped deformation and dimerization realize the differentiation of the interaction moieties, and change of guest-binding modes at specific metal coordination sites among the many present have been achieved utilizing acid/base as external stimuli.

Date: 2017
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DOI: 10.1038/s41467-017-00076-8

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