Structure−Property Correlations in Model Compounds of Oligomer Liquid Crystals

Autor:	Yoshihiko Kuroda, Kentaro Yamaguchi, Hideaki Inaba, Ken-ichi Tozaki, Jun Arou, Yuji Sasanuma, Hideko Hayashi, Tetsushi Ono, Ken Hikino, Emi Miyazaki, Kohji Nakata
Rok vydání:	2004
Předmět:	Deuterium NMR Dimer Crystal structure Oligomer Surfaces Coatings and Films MBBA Crystallography chemistry.chemical_compound chemistry Liquid crystal Materials Chemistry Melting point Physical and Theoretical Chemistry Phase diagram
Zdroj:	The Journal of Physical Chemistry B. 108:13163-13176
ISSN:	1520-5207 1520-6106
Popis:	Structure−property correlations of the following model compounds for oligomer liquid crystals (LCs) have been investigated: monomers, C6H5O(CH2)xCH3 (x = 4 and 5); dimers, C6H5O(CH2)xOC6H5 (x = 3, 4, 5, and 6); and tetramers, C6H5O(CH2)xOC6H4O(CH2)xOC6H4O(CH2)xOC6H5 (x = 5 and 6). Deuterium NMR quadrupolar splittings observed from the deuterated model compounds dissolved in a nematic solvent, 4‘-methoxybenzylidene-4-n-butylaniline (MBBA) or p-azoxyanisole (PAA), were analyzed by the rotational isomeric state scheme with the maximum entropy method to yield the orientational order parameters, bond conformations, and molecular dimensions. For the dimers in particular, the solute shapes were estimated from phase diagrams of the dimer/MBBA systems, the crystal structures were determined by X-ray diffraction, and the melting points and enthalpies of fusion were evaluated from DSC measurements. From the dimers, the so-called odd−even effect was clearly observed in not only the orientational order and molecular ...
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_________::3cf7e7ecbafa7e8e2bd270d9349eb01a https://doi.org/10.1021/jp040135h Zobrazit plný text záznamu