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Identification of a Peripheral Substitution Symmetry Effect in Self‐Assembled Architectures
Author(s) -
Ma XiaoJing,
Yang YanLian,
Deng Ke,
Zeng QingDao,
Wang Chen,
Zhao KeQing,
Hu Ping,
Wang BiQin
Publication year - 2007
Publication title -
chemphyschem
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.016
H-Index - 140
eISSN - 1439-7641
pISSN - 1439-4235
DOI - 10.1002/cphc.200700424
Subject(s) - mesophase , triphenylene , scanning tunneling microscope , highly oriented pyrolytic graphite , molecule , materials science , crystallography , self assembly , discotic liquid crystal , molecular symmetry , columnar phase , nanotechnology , chemical physics , chemistry , liquid crystal , organic chemistry , optoelectronics
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.