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Identification of a Peripheral Substitution Symmetry Effect in Self-Assembled Architectures

✍ Scribed by Xiao-Jing Ma; Yan-Lian Yang; Ke Deng; Qing-Dao Zeng; Chen Wang; Ke-Qing Zhao; Ping Hu; Bi-Qin Wang

Publisher
John Wiley and Sons
Year
2007
Tongue
English
Weight
386 KB
Volume
8
Category
Article
ISSN
1439-4235

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✦ Synopsis

Abstract

Two complementary classes of molecules based on a triphenylene core are synthesized. The two‐dimensional (2D) assemblies of these molecules deposited on a highly oriented pyrolytic graphite (HOPG) surface are identified with scanning tunneling microscopy (STM). Structures with large cavities are formed by symmetric molecules, while uniform and closely packed stripe‐assembled structures are obtained for asymmetric molecules. X‐ray diffraction (XRD) results support the observation of an ordered hexagonal columnar mesophase for symmetric molecules and a rectangular columnar mesophase for asymmetric molecules. The study demonstrates that the substitution symmetry has significant effects on the assembly characteristics of molecular architectures and also on the three‐dimensional (3D) macroscopic properties of the molecular materials.

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