UNUSUAL BILAYERED FLUID SMECTIC MODIFICATIONS IN POLAR SERIES

Progress is made in the generalization of the (x, T) binary diagrams dealing with bilayered fluid smectic phases by describing three new series of polar compounds with a cyano or a nitro terminal group. New arguments are put forward concerning the conspicuousness of the S(A//d)-S(A//2) transition according to the structure of the S(A//d) phase. For the second time a S(A//2) yields S(C//2) yields S//? bilayer sequence appears in which the layers remain liquid.