RT Journal Article
T1 Dissymmetric Chiral Poly(diphenylacetylene)s: Secondary Structure Eluci
A1 Tarrío Cordeiro, Juan José
A1 Rodríguez, Rafael
A1 Fernández Rodríguez, Berta
A1 Quiñoá Cabana, Emilio
A1 Freire Iribarne, Félix Manuel
K1 AFM images
K1 Circular polarized luminescence switch
K1 Poly(diphenylacetylene)s
K1 Secondary structure
K1 Trans-transoid
AB The 3D helix adopted by a non-symmetric substituted poly(diphenylacetylene) (PDPA) is elucidated, and its ability to self-assemble into nanospheres or fiber-like structures under the right conditions is also demonstrated. Moreover, by conformational changes in the pendant group it is possible to produce a helix inversion in the PDPA and create a circular polarized luminescence (CPL) switch. The secondary structure of a dissymmetric and chiral poly(diphenylacetylene) (PDPA) is elucidated by combining the data from NMR experiments (regioregular head to tail structure), Raman and IR studies (E configuration of the polyene double bonds), and high-resolution AFM images (helical pitch, packing angle and orientation of the external helix). As a result, an E-transoidal polyene backbone describing three coaxial helices is obtained. Theoretical electronic circular dichroism (ECD) studies of the structure show a good correspondence between experimental and theoretical data and allow one to decipher that the first Cotton band is generated by the poly(diphenylacetylene) core and not only by the polyene backbone. The dynamic behavior of poly-(S)-2 is also demonstrated by a helix inversion effect produced by conformational changes at the pendant groups when annealed in solvents with different donor abilities. This phenomenon is accompanied by an inversion of the circular polarized luminescence of the PDPA (CPL switch)
PB Wiley
SN 1433-7851
YR 2022
FD 2022
LK http://hdl.handle.net/10347/29252
UL http://hdl.handle.net/10347/29252
LA eng
NO © 2022 The Authors. Angewandte Chemie International Edition published by Wiley-VCH GmbH. This is an open access article under the terms of the Creative Commons Attribution License, which permits use, distribution and reproduction in any medium, provided the original work is properly cited.
NO Agencia Estatal de Investigación. Grant Numbers: PID2019-109733GB-I00, PID2019-107307RB-100, PID2020-117605GB-100. Secretaria Xeral de Investigación e Desenvolvemento, Xunta de Galicia. Grant Numbers: ED431C 2018/30, ED431C 2021/40, ED431G 2019/03
DS Minerva
RD 28 abr 2026