Studies of the thermotropic mesophase behaviour exhibited by a highly asymmetric tetrabenzotriazaporphyrin derivative
作者:
E. A. CORSELLIS,
H. J. COLES,
N. B. MCKEOWN,
P. WEBER,
D. GUILLON,
A. SKOULIOS,
期刊:
Liquid Crystals
(Taylor Available online 1997)
卷期:
Volume 23,
issue 4
页码: 475-479
ISSN:0267-8292
年代: 1997
DOI:10.1080/026782997208055
出版商: Taylor & Francis Group
数据来源: Taylor
摘要:
The thermotropic mesophase behaviour of an asymmetrically shaped and highly substituted tetrabenzotriazaporphyrin (TBTAP) derivative has been studied by optical microscopy, DSC and X-ray diffraction. The TBTAP macrocycle differs from the more common phthalocyanine ring system by the substitution of a methine for a nitrogen at one meso-position. The TBTAP core was substituted with a single heptadecyl chain at this meso-position and four neopentyl groups were statistically distributed around the peripheral benzene rings. In contrast to an earlier study of this system which described the structure of the mesophase as discotic lamellar, detailed X-ray diffraction study indicates that the TBTAP derivative forms a disordered hexagonal columnar mesophase (Colhd), with a weak tendency towards antiparallel orientation of neighbouring molecules observed in the form of a weak pseudo-centred rectangular packing.
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