Rotational Reorganization of Doped Cholesteric Liquid Crystalline Films

Stirring competes with chemical induction in chiral selection of soft matter aggregates

“…The realization of such chiral 'algebra' is even more rewarding given the disparate nature of the involved influences: a threedimensional force of physical nature, operating in centimetrelength scales, facing the chemical effect of a supramolecular level modifier. Notice that this finding is entirely different from previous successful attempts to photomodulate chiral modifierbased influences in doped ferroelectric 38 or cholesteric liquid crystals 39 , or to modify the helicoidal structure of cholesteric liquid crystals by means of an achiral external mechanical field 40 . Unveiled as a new dynamical scenario of chirality control, our contribution should also be envisaged, upon transference of the monolayer into a solid support, as a new strategy for stereocontrol of chemical reactions and responses at chiral surfaces 41,42 .…”

Self-Sorting Chiral Subcomponent Rearrangement During Crystallization

“…63,64 The chiral information expressed by the system comprising helicate 1 and its diastereomers allowed us to track separately the reversible ligand-exchange and imine-exchange processes occurring within this mixture of structures. The sorting of this dynamic library 14 during crystallization provided a novel example of the conversion of a complex mixture of diastereomers into a single pair of enantiomers, driven by the lower solubility of the latter.…”

Chiral doping of nematic phases and its application to the determination of absolute configuration

“…A remarkable example has been reported on recently by Feringa and coworkers. 19,20 They described the rotational reorganization of cholesteric liquid crystalline films as the result of the conversion of a chiral molecular motor dopant to an isomer with a different helical twisting power, leading to a change in the cholesteric pitch. The direction of this reorganization is correlated to the sign of the change in helical twisting power of the dopant.…”