Effect of intermolecular interactions on the formation of mesophases in 3-aryl-7-substituted coumarins, and the crystal structure of 3-(4′-butyl)- and (4′-heptylphenyl)-7-propoxycoumarins

Autor: Filipenko, O. S., Alimova, L. L., Anisimova, T. N., Atovmyan, L. O., Bolotin, B. M.
Zdroj: Russian Chemical Bulletin; October 1989, Vol. 38 Issue: 10 p2073-2079, 7p
Abstrakt: Strong intermolecular interactions in crystalline 3-(4'butyl)- and (4-heptylphenyl)-7-propoxycoumarins, resulting in layered packing, prevent the formation of associates with high anisotropy of intermolecular interaction energy (IIE), so that on heating crystals of these homologs do not form a nematic mesophase. The formation of specific stacked associates in the crystal of 3-(4'-ethoxyphenyl)-7-nonyloxycoumarin favors the formation of thermomesophases. The observation of interactions responsible for the formation of a mesophase has made it possible to obtain dichroic luminophores, namely, substituted 3-aryl-7-aroyloxycoumarins, which possess a nematic phase over a wide temperature range.
Databáze: Supplemental Index
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