Chiral sign induction by vortices during the formation of mesophases in stirred solutions

Achiral diprotonated porphyrins, forming homoassociates in aqueous solution , lead to spontaneous chiral symmetry breaking. The unexpected result is th at the chirality sign of these homoassociates can be selected by vortex mot ion during the aggregation process. This result is confirmed by means of ci rcular dichroism spectra. These experimental findings are rationalized in t erms of the asymmetric influence of macroscopic forces on bifurcation scena rios and by considering the specific binding characteristics of the porphyr in units to form the homoassociates.