RT Journal Article
T1 Conformational Kinetics in Chiral Poly(diphenylacetylene)s: A Dynamic P/M Memory Effect
A1 Tarrío, Juan José
A1 Rodríguez Riego, Rafael
A1 Crassous, Jeanne
A1 Quiñoá Cabana, Emilio
A1 Freire Iribarne, Félix Manuel
K1 Chiral dissymmetric poly(diphenylacetylene)s (PDPA)
K1 Helical structures
K1 P/M Memory Effect
K1 Chemistry
K1 Chiral Polymers
K1 Circular Dichroism
K1 Conformational Kinetics
K1 Memory Effec
AB Dynamic P/M (plus/minus) helical memory in chiral dissymmetric poly(diphenylacetylene)s (PDPA) is shown using a PDPA that bears the benzamide of (L)-alanine methyl ester as pendant. For a single chiral polymer, it is possible to obtain either P or M helical structures in a specific solvent without the presence of any chiral external stimuli. To do that, it is necessary to combine the conformational control at the pendant group with a high steric hindrance at the backbone. In this case, by thermal annealing in low-polar solvents, an anti-conformer is stabilized at the pendant which commands a P helix in the PDPA. Next, solvent removal followed by addition of a polar solvent such as dimethyl sulfoxide (DMSO), results in the kinetic conformationally trapped P helix. However, in this medium, the preferred handedness and the thermodynamic macromolecular helix for poly-(L)-1 is M. This process also occurs in the opposite way. Electronic circular dichroism (ECD) and circularly polarized luminescence (CPL) studies show that the dynamic memory effect is present both in ground and excited states
PB Wiley
SN 1433-7851
YR 2023
FD 2023-06-20
LK http://hdl.handle.net/10347/31164
UL http://hdl.handle.net/10347/31164
LA eng
NO Angew. Chem. Int. Ed. 2023, 62
NO We thank financial support from AEI (PID2019-109733GB-I00) and Juan de la Cierva Incorporación contract (IJC2020-042689-I, R. R.). Xunta de Galicia (ED431C 2022/21, Centro Singular de Investigación de Galicia acreditación 2019–2022, ED431G 2019/03 and the European Regional Development Fund (ERDF) are gratefully acknowledged. J. J. T. thanks MICINN for an FPU contract
DS Minerva
RD 24 abr 2026