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Science 15 June 2001:
Vol. 292. no. 5524, pp. 2063 - 2066
DOI: 10.1126/science.1060835
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Reports

Chiral Sign Induction by Vortices During the Formation of Mesophases in Stirred Solutions

Josep M. Ribó,1* Joaquim Crusats,1 Francesc Sagués,2 Josep Claret,2 Raimon Rubires1

Achiral diprotonated porphyrins, forming homoassociates in aqueous solution, lead to spontaneous chiral symmetry breaking. The unexpected result is that the chirality sign of these homoassociates can be selected by vortex motion during the aggregation process. This result is confirmed by means of circular dichroism spectra. These experimental findings are rationalized in terms of the asymmetric influence of macroscopic forces on bifurcation scenarios and by considering the specific binding characteristics of the porphyrin units to form the homoassociates.

1 Department of Organic Chemistry,
2 Department of Physical Chemistry, University of Barcelona, Martí i Franquès 1, 08028-Barcelona, Catalonia, Spain.
*   To whom correspondence should be addressed. E-mail: jmr{at}qo.ub.es

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Science. ISSN 0036-8075 (print), 1095-9203 (online)