Journal
CHEMISTRY-AN ASIAN JOURNAL
Volume 4, Issue 11, Pages 1687-1696Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/asia.200900254
Keywords
chirality; circular dichroism; nanoparticles; self-assembly; supramolecular chemistry
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Funding
- Spanish Government [AYA2006-1648-C02-01, CTQ2005-08346-C02-01/PPQ]
- COST Actions [D27, CM0703]
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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.
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