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

作　　者：Yun-Chang Zhang Lan Chen Hui Wang Ya-Ming Zhou Dan-Wei Zhang Zhan-Ting Li 

机构地区：[1]Department of Chemistry, Fudan University

出　　处：《Chinese Chemical Letters》2016年第6期817-821,共5页中国化学快报（英文版）

基　　金：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;the National Natural Science Foundation of China (Nos. 21432004 and 21472023)

摘　　要：Two naphthalene（NP） and bipyridinium（BIPY^2＋） alternately incorporated polymers P1 and P2 have been prepared through the formation of dynamic hydrazone bonds. The polymers formed NP–BIPY^2＋donor–acceptor interaction-induced pleated secondary structure. Upon reducing the BIPY^2＋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 BIPY^2＋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.Two naphthalene（NP） and bipyridinium（BIPY^2＋） alternately incorporated polymers P1 and P2 have been prepared through the formation of dynamic hydrazone bonds. The polymers formed NP–BIPY^2＋donor–acceptor interaction-induced pleated secondary structure. Upon reducing the BIPY^2＋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 BIPY^2＋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.

关 键 词：FOLDAMER Donor–acceptor interaction Conjugated radical cation dimerization BIPYRIDINIUM Dynamic covalent chemistry 

分 类 号：O631.1[理学—高分子化学]