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- Title
Dynamic Axial‐to‐Helical Communication Mechanism in Poly[(allenylethynylenephenylene)acetylene]s under External Stimuli.
- Authors
Lago‐Silva, María; Cid, María Magdalena; Quiñoá, Emilio; Freire, Félix
- Abstract
Helix inversion in chiral dynamic helical polymers is usually achieved by conformational changes at the pendant groups induced through external stimuli. Herein, a different mechanism of helix inversion in poly(phenylacetylene)s (PPAs) is presented, based on the activation/deactivation of supramolecular interactions. We prepared poly[(allenylethynylenephenylene)acetylene]s (PAEPAs) in which the pendant groups are conformationally locked chiral allenes. Therefore, their substituents are placed in specific spatial orientations. As a result, the screw sense of a PAEPA is fixed by the allenyl substituent with the optimal size/distance relationship to the backbone. This helical sense command can be surpassed by supramolecular interactions between another substituent on the allene and appropriate external stimuli, such as amines. So, a helix inversion occurs through a novel axial‐to‐helical communication mechanism, opening a new scenario for taming the helices of chiral dynamic helical polymers.
- Subjects
ACETYLENE; ETHYNYL benzene; SPATIAL orientation; ALLENE; CHIRALITY element
- Publication
Angewandte Chemie, 2023, Vol 135, Issue 29, p1
- ISSN
0044-8249
- Publication type
Article
- DOI
10.1002/ange.202303329