Novel low-angle bent-shaped molecules with 1,7-naphthalene central core and single terminal tails can form a hexagonal columnar phase and a common B4 phase. The columnar phase has been determined by using X-ray measurement and electro-optic measurement. A well-oriented X-ray diffraction profile was obtained which clearly indicates a large two-dimensional hexagonal lattice over 65 Å increasing its size with lengthening the terminal chain length, furthermore exhibits ferroelectric switching with spontaneous polarization along the column axis. This is rare example of a switchable columnar liquid crystal phase formed by the usual bent-shaped molecule with a single terminal tail. This columnar phase is ferroelectric; the spontaneous polarization exists along the column axis and the ferroelectric switching takes place without changing the long column axis. Moreover, the combination of asymmetric low bent-angle 1,7-naphathalen core and flexible terminal tail is considered to play an important role in the formation of the switchable columnar phases.
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