Enantioselective Induction of Helical Chirality in Coil‐Structured Amino Acid‐Based Polymers by Conjugated Molecules

Macromolecular Chemistry and Physics, Journal Year: 2025, Volume and Issue: unknown

Published: March 29, 2025

Abstract Chirality induction in aprotic polar solvents is challenging due to disrupted intermolecular interactions and the high conformational flexibility of random‐coil polymers. Herein, a scalable strategy using chiral BINOL as sole source induce helical chirality polymers presented. Circular dichroism (CD), ultraviolet‐visible (UV– vis), resonance Raman spectroscopy confirm that effectively induces cis‐transoidal conformations through hydrogen bonding π–π stacking interactions. CD circularly polarized luminescence (CPL) measurements reveal efficient transfer amplification, with mirror‐image CPL signals observed at 390 nm. Resonance spectra demonstrate enhanced structural order reduced irregularities, evidenced by blue shift narrowed C═C peak, while achiral exhibits minimal ability. This study highlights mechanisms excitation solvents, providing versatile pathway for designing advanced materials exceptional optical fluorescence properties.

Language: Английский

Tunable Circularly Polarized Luminescence from Polyether‐Based Liquid Crystalline Polymer

Macromolecular Chemistry and Physics, Journal Year: 2025, Volume and Issue: unknown

Published: April 14, 2025

Abstract Circularly polarized luminescence (CPL) materials have garnered considerable attention for applications in optical data storage, anti‐counterfeiting, and photonic devices. However, precisely controlling over chirality emissive properties of chiral luminescent polymers remains challenging. Herein, this work presents a series polyether‐based liquid crystalline copolymers (LCPs), denoted Cy x Ch y , synthesized via organocatalyzed ring‐opening copolymerization epoxides bearing cyanostilbene (Cy) cholesterol (Ch) units. The resulting exhibit controlled molar masses, narrow distributions, excellent thermal stability. crystal phase transitions tunable behavior dependent on content, progressing sequentially from nematic 4 1 3 2 to smectic ultimately . Notably, efficient π–π interactions moieties confer pronounced photoluminescence, with emission shifting shorter wavelengths as the proportion decreases. Simultaneously, segments introduce strong CPL signals, achieving |glum| values up 0.28 specific compositions. Remarkably, signal inversion is observed at 4:1 Cy:Ch ratio due selective Bragg reflection within self‐assembled copolymer matrix. These results demonstrate versatile pathway advanced LCPs robust activity, heralding new opportunities high‐performance optoelectronic technologies.

Language: Английский

Co-Assembly-Driven Chiral Induction of Well-Defined Polyfluorene-block-Poly(phenyl isocyanide) and Its Enhanced Circularly Polarized Luminescence Performance

ACS Applied Materials & Interfaces, Journal Year: 2025, Volume and Issue: unknown

Published: April 24, 2025

Chiral induction of polyfluorene (PF)-containing block copolymers plays a crucial role in the development advanced functional materials; however, research this area remains scarce. In contribution, PFO-b-PPI diblock comprising blocks poly(9,9-dioctylfluorene) (PFO) and poly(phenyl isocyanide) (PPI) were readily synthesized one pot by combining chain-growth Suzuki cross-coupling polymerization modified 9,9-dioctylfluorene monomer with Pd(II)-catalyzed phenyl isocyanide bearing pentafluorophenyl ester substitute. The obtained possessed controlled molar mass (Mn) narrow dispersity (Mw/Mn, Đ). Meanwhile, optically active supramolecular assemblies could be formed via coassembly chiral binaphthyl-based inducer film state after thermal annealing treatment, chirality was influenced temperature weight ratio copolymer to inducer, thickness film. Further investigations revealed that exhibited morphology single-handed helical nanofibers, sense nanofibers depended on configuration inducer. Moreover, excellent circularly polarized luminescence (CPL) performance glum as high 0.11.

Language: Английский