Pleated polymeric foldamers driven by donor-acceptor interaction and conjugated radical cation dimerization

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• 作者：Yun-Chang Zhang ; Lan Chen ; Hui Wang ; Ya-Ming Zhou ; Dan-Wei Zhang ; ^{zhangdw@fudan.edu.cn" class="auth_mail" title="E-mail the corresponding author} ; Zhan-Ting Li ; ^{ztli@fudan.edu.cn" class="auth_mail" title="E-mail the corresponding author}
• 关键词：Foldamer ; Donor&ndash ; acceptor interaction ; Conjugated radical cation dimerization ; Bipyridinium ; Dynamic covalent chemistry
• 刊名：Chinese Chemical Letters
• 出版年：2016
• 出版时间：June 2016
• 年：2016
• 卷：27
• 期：6
• 页码：817-821
• 全文大小：502 K

文摘

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.