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oai:recercat.cat:2445/1711002025-11-19T19:24:33Zcom_2072_1057col_2072_478813col_2072_478821col_2072_478917col_2072_478933

00925njm 22002777a 4500 dc Arteaga Barriel, Oriol author Escudero Rodríguez, Carlos author Oncins Marco, Gerard author El Hachemi, Zoubir author Llorens Llacuna, Joan author Crusats i Aliguer, Joaquim author Canillas i Biosca, Adolf author Ribó i Trujillo, Josep M. author 2020-10-08T10:14:12Z 2020-10-08T10:14:12Z 2009-11-02 2020-10-08T10:14:12Z Nanophases of J-aggregates of several achiral amphiphilic porphyrins, which have thin long acicular shapes (nanoribbons), show the immediate and reversible formation of a stationary mechano-chiral state in the solution by vortex stirring, as detected by their circular dichroic signals measured by 2-modulator generallized ellipsometry. The results suggest that when a macroscopic chiral force creates supramolecular chirality, it also creates an enantiomeric excess of screw distortions, which may be detected by their excitonic absorption. An explanation on the effect of the shear flow gradients is proposed on the basis of the orientation of the rotating particles in the vortex and the size, shape, and mechanical properties of the nanoparticles. Porfirines Quiralitat Porphyrins Chirality Reversible mechanical induction of optical activity in solutions of soft-matter nanophases