Stimuli‐Directed Colorimetric Interconversion of Helical Polymers Accompanied by a Tunable Self‐Assembly Process

This is the peer reviewed version of the following article: Rodríguez, R., Quiñoá, E., Riguera, R., Freire, F., Small 2019, 15, 1805413. https://doi.org/10.1002/smll.201805413, which has been published in final form at https://doi.org/10.1002/smll.201805413. This article may be used for non-commercial purposes in accordance with Wiley Terms and Conditions for Use of Self-Archived VersionsInterconversion between extended and bent structures at the pendant groups of a chiral polyene framework [poly(phenylacetylene) with (R)‐(2‐methoxy‐2‐phenylacetyl)glycine residues linked to 4‐vinylanilines] allows the reversible colorimetric transformation from stretched to compressed helical cis‐transoid polyenic structures through manipulation of the flexible spacer. This transformation generates either organogels (stretched helical form) or nanoparticles (compressed helical form) under the control of polar/low polar stimuli respectively and opens the way to the development of new sensors and stimuli‐sensitive materials based on these conceptsFinancial support from MINECO (CTQ2014-61470-EXP, CTQ2015-70519-P), Xunta de Galicia (GRC2014/040, Centro singular de investigación de Galicia accreditation 2016-2019, ED431G/09) and the European Regional Development Fund (ERDF) is gratefully acknowledged. R. R. is grateful to MINECO for a FPI predoctoral fellowshipS