162557-62-2Relevant academic research and scientific papers
Discotic liquid crystals of transition metal complexes, 53?: Synthesis and mesomorphism of phthalocyanines substituted by m -alkoxyphenylthio groups
Chino, Yoshiaki,Ohta, Kazuchika,Kimura, Mutsumi,Yasutake, Mikio
, p. 159 - 178 (2017/07/11)
We have successfully synthesized a series of novel octakis(m-alkoxyphenylthio)phthalocyaninato copper(II) complexes, (m-CnOPhS)8PcCu (n = 2, 4, 6, 8, 10, 12, 14, 16: 1b～1i), by our developed method to reveal their mesomorphism. The phase transition behavior and mesophase structures have been established by using a polarizing optical microscope, a differential scanning calorimeter, and a temperature-dependent small angle X-ray diffractometer. Interestingly, the very short chain-substituted derivatives, (m-C1OPhS)8PcCu (1a) and (m-C2OPhS)8PCu (1b), show a hexagonal ordered columnar (Colho) mesophase, whereas each of the other longer-chain-substituted derivatives, (m-CnOPhS)8PcCu (n = 4～16: 1c～1i), shows only rectangular ordered columnar (Colro) mesophase(s). In contrast to the present longer-chain-substituted phenylthio derivatives, each of the previous longer-chain-substituted phenoxy derivatives, (m-CnOPhO)8PcCu (n = 10-20), shows a different columnar mesophase of Colho. We discuss this difference of mesomorphism from the viewpoint of the different steric hindrance originated by the peripheral substituents, PhO and PhS groups. Moreover, we could estimate the optical band gaps of (m-C10OPhO)8PcCu and (m-C10OPhS)8PcCu (1f) from absorption edge of the Q-bands to be 1.79 eV and 1.70 eV, respectively. Therefore, the phenylthio-substituted derivative gave a narrower band gap byca. 0.1 eV in comparison with the phenoxy-substituted derivative.
A convenient synthesis of 6,6′-dialkoxythioindigo dyes suitable for doping into a liquid crystal host
Dinescu, Liviu,Mezo, Adam,Luyt, Leonard G.,Lemieux, Robert P.
, p. 7549 - 7552 (2007/10/02)
A convenient synthesis of symmetrical 6,6′-di-n-alkoxythioindigo dyes suitable for doping into a liquid crystal host is reported, along with measurements of solubility limits for the dyes in nematic and smectic liquid crystals with broad temperature range.
