Phase behavior of banana-shaped molecules under pressure

The phase transition behavior of two achiral bent core banana-shaped molecules, 3- and 3-(3′-chloro-)(4′-n-octyloxybenzoyloxyphenyliminomethyl)phenyl-4″-n-octyloxy biphenylcarboxylate (I and II), showing the B1 and B2 banana phases, respectively, was investigated under hydrostatic pressures up to 300 MPa using a high-pressure differential thermal analyzer. The T versus P phase diagrams for I and II compounds were constructed. Both the temperature regions of the B1 and B2 phases for I and II compounds are maintained in the whole pressure range and the B1 and B2 phases are thermodynamically stable under pressures.