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Chiral Sign Induction by Vortices During the Formation of Mesophases in Stirred Solutions
Josep M. Ribó,1*Joaquim Crusats,1Francesc Sagués,2Josep Claret,2Raimon 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 homoassociatescan 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 asymmetricinfluence of macroscopic forces on bifurcation scenarios and byconsidering the specific binding characteristics of the porphyrinunits
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
The editors suggest the following Related Resources on Science sites:
In Science Magazine
LETTERS
Donald S. Matteson;, J. M. Ribó, J. Crusats, F. Saguès, J. Claret, and R. Rubires (24 August 2001) Science293 (5534), 1435.
[DOI: 10.1126/science.293.5534.1435] |Full Text »
PERSPECTIVES
Ben L. Feringa (15 June 2001) Science292 (5524), 2021.
[DOI: 10.1126/science.1062070] |Summary »|Full Text »
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PNAS
102, 13743-13748
|Abstract »|Full Text »|PDF »
