Paper
Journal of Materials Chemistry C
phases combining triangular and square cells in a common
superstructure, which would be required to give rise to larger
superlattice structures, and eventually leading to quasi-periodic
columnar LC phases.
C. Tschierske, Angew. Chem., Int. Ed., 2007, 46, 7972–7975;
(d) M. Prehm, C. Enders, M. Y. Anzahaee, B. Glettner,
U. Baumeister and C. Tschierske, Chem.–Eur. J., 2008, 14,
6352–6368.
5 (a) C. Tschierske, Chem. Soc. Rev., 2007, 36, 1930–1970; (b)
¨
C. Tschierske, C. Nurnberger, H. Ebert, B. Glettner,
4. Experimental
M. Prehm, F. Liu, X. B. Zeng and G. Ungar, Interface Focus,
2011, 2, 669–680; (c) G. Ungar, C. Tschierske, V. Abetz,
R. Holyst, M. A. Bates, F. Liu, M. Prehm, R. Kieffer,
X. B. Zeng, M. Walker, B. Glettner and A. Zywocinski, Adv.
Funct. Mater., 2011, 21, 1296–1323.
6 C. Tschierske, Angew. Chem., Int. Ed., 2013, 52, 8828–8878.
7 F. Liu, B. Chen, U. Baumeister, X. B. Zeng, G. Ungar and
C. Tschierske, J. Am. Chem. Soc., 2007, 129, 9578–9579.
8 Q. Zhou, T. Chen, J. Zhang, L. Wan, P. Xie, C. C. Han, S. Yan
and R. Zhang, Tetrahedron Lett., 2008, 49, 5522–5526.
9 J. W. Goodby, J. P. Collings, T. Kato, C. Tschierske,
H. F. Gleeson and P. Raynes, Handbook of Liquid Crystals,
Wiley-VCH, Weinheim, Germany, 2nd edn, 2014.
1H NMR and 13C NMR spectra were recorded in CDCl3 solution
on a Bruker-DRX-500 spectrometer with tetramethylsilane
(TMS) as the internal standard. Elemental analysis was per-
formed using an Elementar VARIO EL elemental analyzer. A
Mettler heating stage (FP 82 HT) was used for the polarizing
optical microscopy (POM, Optiphot 2, Nikon), and DSCs were
recorded with a DSC-7 calorimeter (PerkinElmer) at 10 K minꢀ1
.
X-Ray diffraction (XRD) of the surface aligned samples was
performed using a 2D-detector (HI-Star, Siemens or Vantec-500,
Bruker). Ni ltered and pin hole collimated CuKa was used.
Details of the synthesis and purication, and the analytical data
are reported in the ESI.†
10 Besides these low molecular mass LC molecules involving a
rigid segment, tilings related to the LC honeycombs were
also observed for mictoarm triblock star copolymers,5c see:
S. Sioula, N. Hadjichristidis and E. L. Thomas,
Macromolecules, 1998, 31, 8429–8432; Y. Matsushita,
K. Hayashida and A. Takano, Macromol. Rapid Commun.,
2010, 31, 1579–1587, and more recently for lyotropic
systems of triblock star molecules involving uorocarbon,
hydrocarbon and oligo(ethylene oxide) chains: L. de
Campo, T. Varslot, M. J. Moghaddam, J. J. K. Kirkensgaard,
K. Mortensen and S. T. Hyde, Phys. Chem. Chem. Phys.,
2011, 13, 3139–3152.
Acknowledgements
This work was supported by the National Natural Science
Foundation of China [no. 21364017, no. 21274119], the Yunnan
Natural Science Foundation [no. 2013FA007] and Scholarship
Award for Excellent Doctoral Student of Yunnan Province and
foundation [no. ynuy201418]. M.P. and C.T. acknowledge the
support by DFG (FOR 1145).
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