Design, synthesis, and characterization of symmetrical bent-core liquid crystalline dimers with diacetylene spacer was written by Zhang, Lan-Ying;Zhang, Qi-Kai;Zhang, Yu-Dong. And the article was included in Liquid Crystals in 2013.Recommanded Product: 3-Bromophenyl acetate This article mentions the following:
Two new sym. bent-core liquid crystalline dimers (B-DA4 and B-DA12) bearing diacetylenes spacer and different terminal alkyl chains were successfully synthesized by a Sonogashira coupling reaction. The mol. structures of these dimers were confirmed by 1H-NMR (NMR), Fourier transform-IR spectroscopy (FT-IR), Raman spectroscopy, mass spectrometry, elemental anal. Their thermal stability and liquid crystalline properties were characterized by thermogravimetric anal. (TGA), differential scanning calorimetry (DSC), polarized light microscopy (PLM), and small-angle X-ray scattering (SAXS). Results showed that the diacetylene group may undergo thermal polymerized at about 260° far from thermal decomposition The dimers exhibited monotropic phase behavior and typical layered-structure phase with long-range order on a length scale of about 6.3 nm was observed The results mentioned above offer a promising opportunity to design diacetylene nanowires by thermal, UV irradiation or scanning tunneling microscope (STM) tip-induced polymerization The title compound thus formed included a bent-core dimer (I) and related substances. In the experiment, the researchers used many compounds, for example, 3-Bromophenyl acetate (cas: 35065-86-2Recommanded Product: 3-Bromophenyl acetate).
3-Bromophenyl acetate (cas: 35065-86-2) belongs to organobromine compounds. Bromo compounds are employed in a variety of metal-catalyzed coupling reactions. They are also ideal candidates for the synthesis of Grignard reagents that have wide-applicability in organic synthesis. alpha-Bromoesters are employed in the Reformatsky reaction for the synthesis of beta-hydroxyesters. One prominent application of synthetic organobromine compounds is the use of polybrominated diphenyl ethers as fire-retardants, and in fact fire-retardant manufacture is currently the major industrial use of the element bromine.Recommanded Product: 3-Bromophenyl acetate
Referemce:
Bromide – Wikipedia,
bromide – Wiktionary