Mesomorphic behaviour of N, N-dialkanoyl-3,4,5,6-tetramethylbenzene-1,2-diamines and related compounds

T. Akutagawa, K. Iuchi, Y. Matsunaga

Research output: Contribution to journalArticlepeer-review

14 Citations (Scopus)


DSC, X-ray, broad-line proton NMR, and microscopy studies on several series of N, N' -dialkanoylbenzene-1,2-diamines are presented. The melting point and associated enthalpy are not much affected by methylation of the aromatic nucleus. While the dimethyl compounds carrying heptanoyl-to-hexadecanoyl groups generate metastable mesophases below 111oC, the 3,4,5,6- tetramethyl compounds carrying propionyl-to-hexadecanoyl groups produce stable hexagonal columnar mesophases appearing mostly above 200oC. N, N'-dialkylbenzene-1,2-carboxamides are transformed into birefringent viscous fluids exhibiting a focal-conic texture at a temperature between 76 and 99oC when the alkyl groups are decyl, undecyl, dodecyl, and tetradecyl.

Original languageEnglish
Pages (from-to)1399-1403
Number of pages5
JournalLiquid Crystals
Issue number11
Publication statusPublished - 2000


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