Helical discotic liquid crystals

Chemistry of Materials

Volumn 15, Issue 19, 2003, Pages 3594-3601

  Vyklický, Libor ^a   Eichhorn, S Holger ^b   Katz, Thomas J ^a  

^a Columbia University ^*  (United States)

^b UNIVERSITY OF WINDSOR   (Canada)

Author keywords

[No Author keywords available]

Indexed keywords

CRYSTALLINE MATERIALS; LOW TEMPERATURE EFFECTS; OPTICAL MICROSCOPY; THERMOANALYSIS; X RAY DIFFRACTION ANALYSIS;

HELICAL CORES;

LIQUID CRYSTALS;

HELICENEBISQUINONE; QUINONE DERIVATIVE; TRIS(3,7 DIMETHYLOCTYLOXY)[6]HELICENEBISQUINONE; TRIS(4 DODECYLOXYBENZYLOXY)[6]HELICENEBISQUINONE; TRIS(DODECYLOXYMETHOXY)[6]HELICENEBISQUINONE; TRIS[3 (DODECYLTHIO)PROPANOYLOXY][6]HELICENEBISQUINONE; UNCLASSIFIED DRUG;

ARTICLE; CHEMICAL STRUCTURE; CHIRALITY; DIFFERENTIAL SCANNING CALORIMETRY; ENANTIOMER; LIQUID CRYSTAL; MATERIALS; MICROSCOPY; SYNTHESIS; TEMPERATURE; X RAY DIFFRACTION;

EID: 0141760289     PISSN: 08974756     EISSN: None     Source Type: Journal    
DOI: 10.1021/cm034146j     Document Type: Article

References (45)

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2. There are a few chiral discotics whose cores are saccharides, inositols, or cyclotriveratrylene. Footnotes 2-4 in ref 1 refers to them. There are some that have helically twisted aromatic cores, but they are racemic. Footnote 5 in ref 1 refers to them.
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31. The clearing temperatures of octa-(3,7-dimethyloctyloxy)phthalocyanines, both when the side chains are enantiopure and when they are racemic, are at least 50 °C lower than the clearing temperature of an octaoctyloxyphthalocyanine, (a) van Nostrum, C. F.; Bosman, A. W.; Gelinck, G. H.; Schouten, P. G.; Warman, J. M.; Kentgens, A, P. M.; Devillers, M. A. C.; Meijerink, A.; Picken, S. J.; Sohling, U.; Schouten, A.-J.; Nolte, R. J. M. Chem. Eur. J. 1995, 1, 171, (b) van der Pol, J. F.; Neeleman, E.; Zwikker, J. W.; Nolte, R. J. M.; Drenth, W.; Aerts, J.; Visser, R.; Picken, S. J. Liq. Cryst. 1989, 6, 577. Branching stabilizes other discotic mesophases by lowering the crystal-line-to-mesophase transition temperature: Collard, D. M.; Lillya, C. P. J. Am. Chem. Soc. 1989, 111, 1829.
32. The opposite is seen, for example, in copper complexes of 2-phenylazomethinopyridine (Lai, C. K.; Wang, K.-W.; Lin, R. J. Mater. Chem. 1998, 8, 2379) and in conventional discotic liquid crystals (Reference 20).
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35. Possibly high-resolution analyses ofwell-aligned samples would show a difference.
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43. The effects of benzene-containing side chains on the aggregation of triphenylenes can be seen in the data of (a) Destrade, C.; Mondon, M. C.; Malthete, J. J. Phys. Colloq. 1979, 40, 3 (see Table 2) and (b) Nguyen, H. T.; Gasparoux, H., Destrade, C. Mol. Cryst. Liq. Cryst. 1981, 68, 101 (see Table 1).
44. Leisen, J.; Werth, M.; Boeffel, C.; Spiess, H. W. J. Chem. Phys. 1992, 97, 3749.
45. The procedure was adapted from Jullien, L.; Canceill, J.; Lacombe, L.; Lehn, J.-M. J. Chem. Soc., Perkin Trans. 2 1994, 989.