Abstract
Two charged donor-acceptor [2]catenanes were synthesized by the cyclization of the π-acceptor 1,1′-[1, 4-phenylenebis-(methylene)]bis(4,4′-bipyridinium)bis(hexafluorophosphate)(2) and bis(bromomethyl)benzene with the templates of the π-donor phenylene-diacetylene crown ethers 1a and 1b in the yields of 31%, 35%, respectively. The mass spectra, 1H and 13C NMR spectra confirm that the phenylene-diacetylene crown ethers, with a nonaromatic π-system, successfully template the cyclization of CBPQT4+. The X-ray crystallography analysis shows that the CBPQT4+ ring encircles around the phenylene motif of the crown ethers, leaving the 1,3-butadiyne fragment out of the cavity of CBPQT4+ ring. The mechanically interlocked structure of [2]catenanes was stabilized by the cooperative effects of π-stacking and hydrogen bonding interactions.
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Supported by the National Natural Science Foundation of China(No.21072066) and the Natural Science Foundation of Guangdong Province of China(No.8151063101000015).
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Chen, Mj., Zhou, Sg., Li, M. et al. Synthesis and characterization of two [2]catenanes based on phenylene-diacetylene crown ethers. Chem. Res. Chin. Univ. 29, 1094–1097 (2013). https://doi.org/10.1007/s40242-013-3218-0
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DOI: https://doi.org/10.1007/s40242-013-3218-0