Ferroelectric and Antiferroelectric Smectic and Columnar Liquid Crystalline Phases Formed by Silylated and Non-Silylated Molecules with Fluorinated Bent Cores was written by Keith, Christina;Dantlgraber, Gert;Reddy, R. Amaranatha;Baumeister, Ute;Tschierske, Carsten. And the article was included in Chemistry of Materials in 2007.Computed Properties of C8H7BrO2 This article mentions the following:
Novel liquid crystalline materials with fluorinated biphenyl-based bent aromatic cores were synthesized. The influence of F substitution at the aromatic core and the effects of combining oligosiloxane units and F substitution were studied. The mesophases were studied by polarizing microscopy, calorimetry, x-ray diffraction, and electrooptical studies. Different types of polar smectic and columnar phases were observed Depending on the position of the F substituents antiferroelec. and surface-stabilized ferroelec. switching subtypes of optically isotropic smectic phases composed of domains with opposite chirality sense (dark conglomerate phases) were obtained. All columnar phases represent ribbon phases with an oblique lattice. One type of columnar phase shows ferroelec. switching (ColobPFE), and the other shows antiferroelec. switching (ColobPA) which changes to a nonclassical antiferroelec. switching at reduced temperature During the switching process the mols. reorganize by rotation on a cone in the ColobPFE phase and by rotation around the mol. long axis in the antiferroelec. columnar phase. The switching around the long axis is of special interest as it changes the suprastructural chirality of the LC system. Development of phase structures and switching behavior is discussed with respect to the influences of internal and external interfaces. In the experiment, the researchers used many compounds, for example, 3-Bromophenyl acetate (cas: 35065-86-2Computed Properties of C8H7BrO2).
3-Bromophenyl acetate (cas: 35065-86-2) belongs to organobromine compounds. Many of the organo bromine compounds are relatively nonpolar. Bromine is more electronegative than carbon (2.8 vs 2.5) and hence the carbon in a carbon–bromine bond is electrophilic in nature. Commercially available organobromine pharmaceuticals include the vasodilator nicergoline, the sedative brotizolam, the anticancer agent pipobroman, and the antiseptic merbromin. Computed Properties of C8H7BrO2
Referemce:
Bromide – Wikipedia,
bromide – Wiktionary