- I. Fischbach, T. Pakula, P. Minkin, A. Fechtenkötter,
K. Müllen, H. W. Spiess, K. Saalwächter.
Structure and dynamics in columnar discotic materials: A combined X-Ray
and solid-state NMR study of hexabenzocoronene derivatives.
J. Phys. Chem. B 106, 6408-6418 (2002).
The solid columnar discotic and liquid crystalline (LC) phases formed by
alkyl-substituted hexabenzocoronene (HBC) mesogens have been investigated by a
combination of X-ray scattering and a variety of advanced solid state NMR
methods. Correlations between chemical structure, molecular packing and dynamics
are established. Maximum charge carrier mobility is observed for a crystal-like
stacking of the discs in the column with optimised π-π interactions. For
systems with lower intracolumnar order the charge carrier mobility is slightly
lower and slow axial motion of the discs around the column axes occurs.