Abstract
Two series of hexakis(alkyloxy)triphenylenes have been synthesised
and characterised. All materials contain two different lengths of n-alkyloxy
chains. Series I
(C5Cn)
materials contain three –OC5H11 chains and three –OCnH2n + 1 chains. Series II
(CmCn)
materials contain three –OCmH2m + 1
chains and three –OCnH2n + 1
chains, such that m + n
= 10.
Hexagonal columnar mesophases are observed in Series I for n ≥ 3
and, in Series II, for C5C5 and C6C4.
Investigation by XRD shows that, within Series I, increasing the
Cn chain length increases the intercolumnar spacing. Furthermore,
the intercolumnar spacings for constitutional isomers are identical. The difference
in the lengths of the two types of