N.M.R. study of segmental molecular interactions in liquid crystals

Autor:	K. J. Nikolakopoulos, M. A. Theodoropoulou, D. J. Photinos
Rok vydání:	1988
Předmět:	Coupling constant Materials science Isotropy Thermodynamics General Chemistry Condensed Matter Physics Radial distribution function Homologous series chemistry.chemical_compound chemistry Liquid crystal Additive function Phase (matter) General Materials Science Anisotropy
Zdroj:	Liquid Crystals. 3:695-704
ISSN:	1366-5855 0267-8292
Popis:	A simple statistical model of interacting non-rigid molecules, based on a perturbation expansion of the pair correlation function and the additivity of segmental interactions, is applied to the study of orientational order as measured by N.M.R. in the nematic and SA phases of 4-n-alkyl-4′-cyanobiphenyls (N-CB, N = 5 to 8), the nematic and SC phases of 4-n-alkyloxybenzoic acids (N-OBA, N = 7, 8) and the D h0 columnar discotic phase of hexa-alkyloxytriphenylenes (N-THE, N = 5 to 8). The order parameters of each homologous series are correctly described in terms of two isotropic and two anisotropic segmental coupling constants. The model predicts certain relations among coupling constants pertaining to different homogous series. These predictions are supported by the results obtained for the three types of compounds studied.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_________::c9c24e73f684179dd686133f06a70af1 https://doi.org/10.1080/02678298808086524 Zobrazit plný text záznamu