Computer simulation of chiral liquid crystal phases IX. Chiral induction in guest-host systems - Calculation of the helical twisting power

The chiral induction in liquid crystalline phases was studied by Monte Carl o simulation of the chiral Lebwohl-Lasher model. Binary guest-host systems composed of achiral and chiral molecules as well as of different chiral mol ecules were investigated in dependence on the composition. A cholesteric ph ase was induced by dissolving a small fraction of chiral molecules in a nem atic phase. For dilute solutions the equilibrium pitch was found to be a li near function of the chiral dopant concentration. Independent of system siz e effects the application of self-determined boundary conditions enabled th e determination of the symmetry adapted quantities for the chiral induction , the helical twisting power (HTP) and the achiral helical twisting power ( AHTP). Additionally, a different orientational behaviour of enantiomeric do pants in the chiral surroundings of a cholesteric host phase has been deter mined.