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Title: Reversible mechanical induction of optical activity in solutions of soft-matter nanophases
Author: Arteaga Barriel, Oriol
Escudero Rodríguez, Carlos
Oncins Marco
El Hachemi, Zoubir
Llorens Llacuna, Joan
Crusats i Aliguer, Joaquim
Canillas i Biosca, Adolf
Ribó i Trujillo, Josep M.
Keywords: Porfirines
Issue Date: 2-Nov-2009
Publisher: Wiley-VCH
Abstract: 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.
Note: Versió postprint del document publicat a:
It is part of: Chemistry-An Asian Journal, 2009, vol. 4, num. 11, p. 1687-1696
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ISSN: 1861-4728
Appears in Collections:Articles publicats en revistes (Física Aplicada)
Articles publicats en revistes (Química Inorgànica i Orgànica)
Articles publicats en revistes (Enginyeria Química i Química Analítica)

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