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

Autor:	Tomoyuki Akutagawa, Yoshio Matsunaga, K. Iuchi
Rok vydání:	2000
Předmět:	chemistry.chemical_classification Materials science Hexagonal crystal system Enthalpy General Chemistry Condensed Matter Physics Crystallography chemistry Liquid crystal Melting point Proton NMR Organic chemistry General Materials Science Texture (crystalline) Alkyl
Zdroj:	Liquid Crystals. 27:1399-1403
ISSN:	1366-5855 0267-8292
DOI:	10.1080/026782900750018537
Popis:	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.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_________::3e6a52c57c4637930b090c7b5f56baee https://doi.org/10.1080/026782900750018537 Zobrazit plný text záznamu