Crystal structures of 2,3,6,7,10,11-oxytriphenylenes. Implications for columnar discotic mesophases

被引:40
作者
Andresen, TL
Krebs, FC [1 ]
Thorup, N
Bechgaard, K
机构
[1] Tech Univ Denmark, Dept Chem, DK-2800 Lyngby, Denmark
[2] Riso Natl Lab, Condensed Matter Phys & Chem Dept, DK-4000 Roskilde, Denmark
关键词
D O I
10.1021/cm0003020
中图分类号
O64 [物理化学(理论化学)、化学物理学];
学科分类号
070304 ; 081704 ;
摘要
The structures of the oxysubstituted triphenylene premesogens, 2,3,6,7,10,11-hexahydroxy-triphenylene (4), 2,3,6,7,10,11-hexamethoxytriphenylene (5), 2,3,6,7,10,11-hexaethoxytriphenylene (6), and 2,3,6,7,10,11-hexapropoxytriphenylene (7) were determined, and the structural results were investigated in the aim that a detailed structural knowledge of the discotic premesogens could be used to infer detailed structural knowledge with respect to known liquid crystal mesogens where little detailed structural knowledge is available. It was found that the crystal structures of the discotic premesogens were very different from the structures expected for discotic columnar behavior. These differences allowed us to shed some light on the structural forces that gives rise to the mesophasic behavior observed in such systems as being not due to stacking of the planar aromatic core as inferred hitherto but rather governed by the alkyl groups.
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页码:2428 / 2433
页数:6
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