Stimuli-responsive synthetic helical polymers

Abstract

Synthetic dynamic helical polymers (supramolecular and covalent) and foldamers share the helix as a structural motif.

Thermo/Light Dual-Responsive Helical Dendronized Poly(phenylacetylene)s

“…. 1 H NMR spectra were recorded on a Bruker AV 500 spectrometer ( 1 H: 500 MHz, 13 C: 125 MHz). ESI-MS analyses were performed on a Thermo Scientific Q Exactive HF Orbitrap-FTMS.…”

“…The mixture was allowed to increase to room temperature with stirring for 12 h. After evaporation of solvents with vacuum, column chromatography (0% ∼ 50% DCM/HEX gradient) followed by recrystallization from HEX afforded the product as lightyellow crystals (199.65 mg, 47%). 1…”

“…Poly(3,4,5-tris(2-(2-(2-methoxyethoxy)ethoxy)ethoxy)benzyl (4-ethynyl benzoyl)-L-alaninate) 920 -block-Poly((R)-2-(3′,3′-dimethyl-6-nitrospiro[chromene-2,2′-indolin]-1′-yl) ethyl 4-ethynylbenzoate) 26 (PolyPA 920 -block-PolySP 26). According to general procedure A, from M PA (200 mg, 0.25 mmol), M SP (6.06 mg, 0.013 mmol), and a [Rh(nbd)Cl] 2 mixture (177 μL) in THF (0.8 mL), the copolymer was obtained as a yellow solid (187 mg, 91%) 1. H NMR (DMSO-d 6 , 80 °C): δ = 1.35 (d, J = 7.0 Hz, 3H, CH 3 ), 3.20 (d, J = 20.0 Hz, 9H, CH 3 ), 3.35−3.56 (m, 24H, CH 2 ), 3.67 (q, J = 5.6, 4.9 Hz, 6H, CH 2 ), 3.95−4.08 (m, 6H, CH 2 ), 4.50 (s, 1H, CH), 4.96 (dd, J = 49.4, 13.0 Hz, 2H, CH 2 ), 5.72 (s, 1H, CH), 6.58 (br, 2H, Ar-H), 6.74 (br, 2H, Ar-H), 7.52 (br, 2H, Ar-H), 8.11 (s, 1H, N−H).…”

Construction of secondary and tertiary chiral structures in side-chain azobenzene polymers with flexible main chains

“…Artificially synthesized chiral polymers, as a result, have garnered extensive attention from chemists. 9–16…”

Fluorescence-Selective Absorption and Circularly Polarized Fluorescence Energy Transfer Assist the Generation of Multicolor Circularly Polarized Luminescence in Chiral Helical Polyacetylene-Based Janus Nanofibers

“…Chiroptical nanomaterials with circularly polarized luminescence (CPL) performance are drawing substantial interest in multidisciplinary fields due to their promising potential in 3D displays, optical sensors, bioimaging, asymmetric catalysis, etc. − Among various CPL-active architectures, − CPL nanofibers have been widely studied, and most of them are prepared by a self-assembly strategy. − However, the nanofibers prepared by self-assembly are largely limited to specific systems, and the resulting products are discontinuous, which may not be conducive to practice applications. Delightedly, the past few years have witnessed the rapid development of an electrospinning technique, and it has proved to be an effective method for constructing flexible and continuous CPL nanofibers with a controlled morphology, uniformity, and the desired optical properties. − The advantages of electrospinning include ease of operation, reliable reproducibility, and low cost.…”