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M. Yonenaga, Bull. Chem. Soc. Jpn., 1988, 61, 207–210; (b)
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stability of the columnar LC phases. The phase range is
considerably widened by reducing the chain length, mainly due
to the reduction of the melting points. However, it seems that
the reduced number of hydrogen bonding sites does not allow the
formation of polar order along the column axis as observed for
some columnar LC based on ureas.10 The occurrence of a strong
CD signal (compound 6*) indicates a chirality induced helical
organization of the molecules within the columnar structure
stabilized through hydrogen bonding. More generally, it is
suggested that the concept of combining of 2,3,4- and
3,4,5-substituted aromatics at the periphery of larger disc-like
p-conjugated molecules could provide an additional way to
obtain low melting columnar LC materials with wide phase
ranges for molecular electronics applications.25 This concept
needs to be further explored in the future.
€
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