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Highly Ordered Columnar Structures from Hexa‐ peri ‐hexabenzocoronenes—Synthesis, X‐ray Diffraction, and Solid‐State Heteronuclear Multiple‐Quantum NMR Investigations
Author(s) -
Fechtenkötter Andreas,
Saalwächter Kay,
Harbison Martha A.,
Müllen Klaus,
Spiess Hans Wolfgang
Publication year - 1999
Publication title -
angewandte chemie international edition
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 5.831
H-Index - 550
eISSN - 1521-3773
pISSN - 1433-7851
DOI - 10.1002/(sici)1521-3773(19991018)38:20<3039::aid-anie3039>3.0.co;2-5
Subject(s) - heteronuclear molecule , mesophase , crystallography , hexa , alkyl , materials science , scattering , diffraction , chemistry , nuclear magnetic resonance spectroscopy , stereochemistry , liquid crystal , organic chemistry , physics , optics , optoelectronics
Improved long‐range ordering in the columnar mesophase of hexa( para ‐ n ‐dodecylphenyl)hexabenzocoronene 1 has been achieved by inserting phenyl rings between the extended aromatic core of hexabenzocoronene and the alkyl side chains, which are needed to form liquid crystalline phases. The long‐range hexagonal order of the columns is demonstrated by X‐ray scattering, while the improved packing of the aromatic cores within the columns and the molecular mobility is probed by a newly developed heteronuclear multiple‐quantum MAS NMR technique.