2017 年 75 巻 5 号 p. 476-490
New functions of helical poly(quinoxaline-2,3-diyl)s (PQX) have been developed on the basis of highly efficient, dynamic induction of single-handed helical structure by using various chiral side chains along with incorporation of achiral functional monomer units. The efficiency and direction of the screw-sense induction are significantly dependent on chiral side chains, achiral side chains, solvents, and pressure according to normal and abnormal sergeants-and-soldiers effect. The dynamic nature of the helix induction allows sharp inversion of their helical sense between two solvents such as CHCl3/1,1,2-trichloroethane, THF/t-butyl methyl ether, and even n-octane/cyclooctane. PQXs having functional units are utilized as chirality-switchable chiral catalysts and materials for emission/reflection of circularly polarized light. Chirality-amplifying asymmetric catalyst system is demonstrated on the basis of majority-rule effect on the induction of macromolecular helical structure.