title: Chiral sign induction by vortices during the formation of mesophases in stirred solutions.
abstract: 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.
authors.affiliation: Department of Organic Chemistry, Department of Physical Chemistry, University of Barcelona, Marti i Franquès 1, 08028-Barcelona, Catalonia, Spain. jmr@qo.ub.es
authors.forename: J M
authors.initials: JM
authors.lastname: Ribó
authors.forename: J
authors.initials: J
authors.lastname: Crusats
authors.forename: F
authors.initials: F
authors.lastname: Sagués
authors.forename: J
authors.initials: J
authors.lastname: Claret
authors.forename: R
authors.initials: R
authors.lastname: Rubires
mesh_terms: D002942:Circular Dichroism; D003460:Crystallization; D006860:Hydrogen Bonding; D008968:Molecular Conformation; D009038:Motion; D011166:Porphyrins / Q000737:chemistry*; D013057:Spectrum Analysis; D055672:Static Electricity; D013237:Stereoisomerism
chemical_list: C429764:5,10,15-tris(4-sulfonatophenyl)-20-phenylporphryin; D011166:Porphyrins