Unravelling the pathway complexity in conformationally flexible N-centered triarylamine trisamides

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Two families of C3-symmetrical triarylamine-trisamides comprising a triphenylamine- or a tri(pyrid-2-yl)amine-core are presented. Both families self-assemble in apolar solvents via cooperative hydrogen-bonding interactions into helical supramolecular polymers as evidenced by a combination of spectroscopic measurements, and corroborated by DFT calculations. The introduction of a stereocenter in the side chains biases the helical sense of the supramolecular polymers formed. Compared to other C3-symmetrical compounds, a much richer self-assembly landscape is observed. Temperature-dependent spectroscopy measurements highlight the presence of two self-assembled states of opposite handedness. One state is formed at high temperature from a molecularly dissolved solution via a nucleation-elongation mechanism. The second state is formed below room temperature through a sharp transition from the first assembled state. The change in helicity is proposed to be related to a conformational switch of the triarylamine core due to an equilibrium between a 3:0 and a 2:1 conformation. Thus, within a limited temperature window, a small conformational twist results in an assembled state of opposite helicity.
Originele taal-2Engels
Pagina's (van-tot)6103-6110
Aantal pagina's8
TijdschriftChemistry : A European Journal
Nummer van het tijdschrift25
StatusGepubliceerd - 2 mei 2017

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