Chiral expression in conjugated helical block copolymers

Abstract

The organizational behaviour of block copolymers consisting of two helical blocks with opposite chiral expression is investigated.

Homochiral π‐Rich Covalent Organic Frameworks Enabled Chirality Imprinting in Conjugated Polymers: Confined Polymerization and Chiral Memory from Scratch

“…[1,2] OACPs with controlled helix sense (i.e., chirality) have recently attracted significant interest not only for their synthetic capability in mimicking biological helices but also for achieving novel chirality-relevant properties-circularly polarized luminescence, enantioselective separation and catalysis, and enantioselective recognition and sensing-that are unachievable by achiral analogues. [3][4][5][6][7][8][9][10][11][12][13] Currently, the most straightforward and efficient synthetic methodologies toward artificial OACPs are based on the direct polymerization of conjugated monomers covalently decorated with optically active side moieties, or copolymerization of optically active and silent monomers to form alternating copolymers, [14][15][16][17][18][19][20][21][22][23][24][25] which both require tedious multistep organic syntheses and, hence, are high in cost. Recently, by endowing achiral or prochiral monomers with bulky pendant substituents and introducing chiral catalysts or initiators into the polymerization reaction system, chemists have successfully developed a helix-sense-selective catalytic approach, which can effectively circumvent the disadvantages of direct synthesis.…”