Syntheses of Some Schiff Base Nematic Mesogens and the Study of Their Binary Phase Diagrams by Miscibility Experiments
The following four Schiff base compounds known to exhibit the nematic phase only have been prepared.(a)2-Hydroxy-4-Ethoxybenzylidene-4-Butylaniline(OH-EBBA).(b)4-Cyanobenzylidene-4-methoxyaniline (CNBMeOA). (c) 2-Hydroxy – 4 - Methoxybenzylidene-4-Butylaniline (OH-MBBA).(d) 4- Methylbenzylidene -4- cyanoaniline (MeBCNA). The compounds have been characterized by UV/VIS, IR, and Hʹ NMR spectra. Two binary systems were prepared. System 1, by mixing OH – EBBA and CNBMeOA; and system 2, by mixing OH –MBBA and MeBCNA. The liquid crystalline behavior of the prepared compounds and those of the mixtures of the two systems was studied by differential scanning calorimetry (DSC) and hot-stage polarized optical microscopy (POM). Comparative study on the binary phase diagrams of the two systems revealed that, the permanent dipole – induced dipole interactions responsible for the induced phases, semctic C (SmC) and smectic A (Sm A), over a long range of mole fractions, are much stronger in system 1 than in system 2 . An explanation for this behavior has been put forward.
Belarbi – Massouras Z., Guillaud G., Tournilhac F., Acourag H., and Khelifa B., Jap.J.App.Phys., (1991), 711.
Belarbi M.Z., Guillaud G., Tournilhac F., Acourag H., and Khelifa B., Japanese Journal of applied physics, (1991), 30, 4, 711-715.
Belarbi Z., Guillaud G., Maitrot M., Huck J., Simon J., and Tournillhac F., Revue phys. Appl., (1988), 23, 143.
Dernus D., Diele S., Klapperstuck M., Link V., and Zaschke H., Mol. Cryst. and Liq. Cryst., (1971), 15, 161.
Faeza A. Almashal, Journal of Basrah Researches ((Sciences)), (2011), 37, 2.
Fukai M., and Matsunaga Y., Bull. Chem. Soc. Japan, (1981), 54, 3137.
Govindarajan M., Periandy S., and Ganesan K., E-Journal of Chemistry, (2010), 7, 2, 457-464.
Haas E.L. Werner, Adams E.J., Flannery B.J., and Mehlowitz B., United state patent , (1973), 3,779,751.
Hamad W., “synthesis of two new series of thiazolo [5, 4-d] thiazoles and the study of their liquid crystalline behaviour by miscibility”, University of Baghdad-Iraq, Ph.D (2001).
Keller P., and Liebert L., “solid state physics, supplement 14: Liquid- Crystal synthesis for physicist”, (1978), p: 39.
Madhusudana N.V. and Moodithaya K.P.L., Mol.Cryst.Liq.Cryst. (1983), 90, 357-364.
Ojala H.W., Smieja M.J., Spude J.M., Arola M.T., Kuspa K.M., Herrera N., and Ojala R.C., Acta Cryst., (2007), B63, 485 – 496.
Patch G., Hope G.A., J.Chem.Educ., (1985), 62, 454.
Sackamann H., and Demus D., Molecular Crystals and Liquid Crystals, (1973), 21, 239-273.
Sadle-Sosnowska N., J.Chem.Educ., (1979), 56, 759
Sharma N.K., Pelzl G., Demus D., and Weissflog W., Z.phys.Chem.(Leipzig), (1980), 261, 579.
Silva S. R. P., Robertson .J. Amaratunga .G. A. J., Rafferty B., Brown .L. M., J. Appl. Phys.,( 1997), 81, 6, 2626.
Somerton C., Mol.cryst.Liq.Cryst., (1988), 154, 77.
Srikanta B.S. and Madhusudana N. V., Mol. Cryst. Liq. Cryst., (1983), 99, 203-221.
Srikanta B.S. and Madhusudana N.V, Mol.Cryst.Liq.Cryst., (1983), 99, 203.
Subodh K., organic chemistry Spectroscopy of Organic Compounds, Guru Nanak Dev University Amritsar-India-, ( 2006).
Van der meulen J.P., Zijlstra R.J.J., J.physique, (1982), 43, 411-420.
Verbit L., J.Chem.Educ., (1972), 49, 36.
Authors who publish with this journal agree to the following terms:
- Authors retain copyright and grant the journal right of first publication with the work simultaneously licensed under a Creative Commons Attribution License [CC BY-NC-SA 4.0] that allows others to share the work with an acknowledgment of the work's authorship and initial publication in this journal.
- Authors are able to enter into separate, additional contractual arrangements for the non-exclusive distribution of the journal's published version of the work, with an acknowledgment of its initial publication in this journal.
- Authors are permitted and encouraged to post their work online.