So far, in addition to halogen atoms, other non-metallic atoms can become part of the aromatic heterocycle, and the target ring system is still aromatic.Nayak, Rashmi Ashwathama; Bhat, Sachin A.; Rao, D. S. Shankar; Yelamaggad, C. V. researched the compound: 8-Bromooctanoic acid( cas:17696-11-6 ).SDS of cas: 17696-11-6.They published the article 《Wide thermal range, exclusive occurrence of technically significant chiral nematic phase: synthesis and mesomorphism of cholesterol-based non-symmetric dimers》 about this compound( cas:17696-11-6 ) in Bulletin of Materials Science. Keywords: cholesterol salicylaldimine liquid crystal preparation mesomorphism; cholesteryl hydroxy benzylidene amino phenoxy ester preparation mesomorphism. We’ll tell you more about this compound (cas:17696-11-6).
Fifteen new non-sym. chiral dimers belonging to three different series have been synthesized and evaluated for their mesomorphic properties. They were formed by interlinking cholesterol with salicylaldimine (SAN) cores (with reverse imine groups) via an ω-oxyalkanoyloxy spacer. Within a series, the length of the terminal n-alkoxy tails had been varied for a fixed even-parity spacer. Three even-parity spacers such as 4-oxybutanoyloxy, 6-oxyhexanoyloxy and 8-oxyoctanoyloxy have been used to join two cores, whereas the terminal tails such as n-butyloxy, n-hexyloxy, n-octyloxy, n-decyloxy and n-dodecyloxy chains have been attached to the SAN core. Microscopic and calorimetric exptl. results show that all the dimers behave identically exhibiting the chiral nematic (N*) phase solely, which was authenticated by powder X-ray diffraction studies carried out on some selected samples. In the vast majority of the cases,the phase was thermodynamically stable, and while cooling, it exists over a wide thermal range covering room temperature(RT)due to supercooling. Finding was notable given the fact that the N* phase possesses technol. significant optical properties. At RT, the N* phase displayed one of the iridescent colors characteristically caused by interference and diffraction of the reflected and scattered light. A comparative study reveals that the lengths of both the terminal chain and central spacer influence the clearing temperature of the dimers, and also the temperature range of the N* phase. The selective reflection measurements revealed that the pitch of the N* phase was either temperature sensitive or temperature insensitive. Temperature-dependent CD (CD) spectra were recorded for the planar texture of the N* phase formed by a dimer, as a representative case. The presence of an intense neg. CD band suggests the left-handed screw sense of the N* phase helix.
Different reactions of this compound(8-Bromooctanoic acid)SDS of cas: 17696-11-6 require different conditions, so the reaction conditions are very important.
Reference:
Bromide – Wikipedia,
bromide – Wiktionary