title: NMR of bent-core nematogens: a mini-review.
abstract: This review focuses on two of our studied bent-core liquid crystals 2-methyl-3-[4-(4-octylbenzoyloxy)-benzylidene]-amino-benzoic acid 4-(4-dodecylphenylazo)-phenyl ester A131, and a shape-persistent fluorenone mesogen, F1a by means of temperature-dependent (13)C NMR spectra and deuterium NMR spectra, respectively. Orientational order parameters, molecular packing, and/or conformations in the nematic phases or nematic glass can be extracted from the observed NMR spectra. These will be discussed in terms of certain motional models. In particular, F1a has been found to form a biaxial nematic glass. The derived orientational order parameters would put the biaxial system of phase symmetry lower than orthorhombic.
authors: Departamento de Física, Instituto Superior Técnico, Universidade de Lisboa, Lisboa, Portugal; CFMC, Universidade de Lisboa, Lisboa, Portugal.
authors: João L
authors: JL
authors: Figueirinhas
authors: Ronald Y
authors: RY
authors: Dong
keywords: 13C; 2H; A131; F1a; NMR; order parameters; phase symmetry; restricted motion