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| Pleated polymeric foldamers driven by donor–acceptor interaction and conjugated radical cation dimerization |
| Yun-Chang Zhang, Lan Chen, Hui Wang, Ya-Ming Zhou, Dan-Wei Zhang, Zhan-Ting Li |
| Department of Chemistry, Fudan University, Shanghai 200433, China |
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Abstract Two naphthalene (NP) and bipyridinium (BIPY2+) alternately incorporated polymers P1 and P2 have been prepared through the formation of dynamic hydrazone bonds. The polymers formed NP-BIPY2+ donor-acceptor interaction-induced pleated secondary structure. Upon reducing the BIPY2+ units to radical cation BIPY·+, intramolecular dimerization of the BIPY·+ units induced the backbones to afford another pleated secondary structure. Adding electron-rich macrocyclic polyether bis-1,5-dinaphtho[38]crown-10 or electron-deficient cyclobis(paraquat-p-phenylene) cyclophane did not break the first foldamer by complexing the BIPY2+ or NP units of the polymers, whereas the di(radical cationic) ring of the second cyclophane could break the second foldamer by forming threading complexes with the BIPY·+ units of the polymers.
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Received: 15 February 2016
Published: 02 April 2016
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| Fund:This work was financially supported by The Ministry of Science and Technology of China (No. 2013CB834501), The Science and Technology Commission of Shanghai Municipality (No. 13M1400200), The Ministry of Education of China research fund for the doctoral program, and the National Natural Science Foundation of China (Nos. 21432004 and 21472023). |
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Corresponding Authors:
Dan-Wei Zhang, Zhan-Ting Li
E-mail: zhangdw@fudan.edu.cn;ztli@fudan.edu.cn
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