Chiral biscalixarenes and a C60-appended polyphenylacetylene have been synthesized. The chiral biscalixarene encapsulated the C60 unit of the phenylpolyacetylene, which induced the preferred helicity of the polyacetylene.
Download full-text PDF |
Source |
|---|---|
| http://dx.doi.org/10.1039/d0cc02506b | DOI Listing |
Publication Analysis
Top Keywords
Similar Publications
This communication introduces helical polyacetylene (P1) with an appended acceptor (A)-donor (D)-acceptor (A) conjugated chromophore as a promising ferroelectric candidate. The helical conformation of P1 leads to a highly stable chiral assembly of the appended ADA chromophores. This results in prominent ferroelectricity as evident from the superior hysteresis loop at room temperature, exhibiting a saturation polarization () value ∼2 μC cm and remanent polarization () value ∼1.
View Article and Find Full Text PDFHelix-Sense-Selective Memory Polymerization of Biphenylylacetylenes Bearing Carboxy and Amino Groups in Water.
Angew Chem Int Ed Engl
November 2024
Department of Molecular and Macromolecular Chemistry Graduate School of Engineering, Nagoya University Chikusa-ku, Nagoya, 464-8603, Japan.
We report the helix-sense-selective memory polymerization (HSMP) of achiral biphenylylacetylenes bearing carboxy and amino pendant groups in the presence of basic and acidic chiral guests in water, respectively. The HSMP proceeds in a highly helix-sense-selective manner driven by noncovalent chiral ionic interactions between the monomers and guests under kinetic control, producing the one-handed helical polymers with a static memory of helicity in one-pot during the polymerization in a very short time, accompanied by amplification of asymmetry. The carboxy-bound helicity-memorized polymer self-assembles into a cholesteric liquid crystal in concentrated water, in which a variety of basic achiral fluorophores further co-assembles to form supramolecular helical aggregates that exhibit an induced circularly polarized luminescence in a color tunable manner.
View Article and Find Full Text PDFCircularly Polarized Phosphorescence Energy Transfer Combined with Chirality-Selective Absorption for Modulating Full-Color and White Circularly Polarized Long Afterglow.
Angew Chem Int Ed Engl
October 2024
State Key Laboratory of Chemical Resource Engineering, Beijing University of Chemical Technology, Beijing, 100029, China.
Circularly polarized long afterglow (CPLA) attracts great interests in multi-disciplinary fields with significant potentials in optical multiplexing applications, but achieving full-color and white CPLA is still challenging. The present contribution reports the first success in utilizing circularly polarized phosphorescence energy transfer (CPP-ET) combined with chirality-selective absorption (CSA) to construct full-color and white CPLA materials. Blue CPLA with luminescence dissymmetry factor (g) of 3×10 is firstly obtained via the CSA effect of chiral helical polyacetylene and blue ultralong afterglow of inorganic phosphor BP.
View Article and Find Full Text PDFInducing and Switching the Handedness of Polyacetylenes with Topologically Chiral [2]Catenane Pendants.
Angew Chem Int Ed Engl
September 2024
Shanghai Key Laboratory of Green Chemistry and Chemical Processes, State Key Laboratory of Petroleum Molecular and Process Engineering, School of Chemistry and Molecular Engineering, East China Normal University, Shanghai, 200062, China.
To explore the chirality induction and switching of topological chirality, poly[2]catenanes composed of helical poly(phenylacetylenes) (PPAs) main chain and topologically chiral [2]catenane pendants are described for the first time. These poly[2]catenanes with optically active [2]catenanes on side chains were synthesized by polymerization of enantiomerically pure topologically chiral [2]catenanes with ethynyl polymerization site and/or point chiral moiety. The chirality information of [2]catenane pendants was successfully transferred to the main chain of polyene backbones, leading to preferred-handed helical conformations, while the introduction of point chiral units has negligible effect on the overall helices.
View Article and Find Full Text PDFFluorescence-Selective Absorption and Circularly Polarized Fluorescence Energy Transfer Assist the Generation of Multicolor Circularly Polarized Luminescence in Chiral Helical Polyacetylene-Based Janus Nanofibers.
ACS Macro Lett
June 2024
State Key Laboratory of Chemical Resource Engineering, Beijing University of Chemical Technology, Beijing 100029, China.
Chiroptical nanomaterials with circularly polarized luminescence (CPL) performance have aroused increasing attention. Herein, multicolor CPL-active Janus nanofibers are prepared through a simple parallel electrospinning method using chiral helical polyacetylenes as the chiral source and achiral fluorophores as the fluorescent source. Interestingly, despite a direct spatial isolation between the chiral component and the fluorescent component, blue and green CPL emissions can still be obtained due to the fluorescence-selective absorption behavior of chiral helical polyacetylenes, with a satisfactory dissymmetric factor () of 2 × 10 and 2.
View Article and Find Full Text PDFWant AI Summaries of new PubMed Abstracts delivered to your In-box?
Enter search terms and have AI summaries delivered each week - change queries or unsubscribe any time!