Open Access
Subscription or Fee Access
A study of mesomorphic properties of Rod shaped 1, 2, 4-triazine integrated imine compounds
Abstract
Synthesis of typical rod-like liquid crystals has a great interest in numerous applications. The model has a terminal chain attached to only one end of the central rigid core. At the other end of the rigid core is a functional group that can be either polar or nonpolar. There are three kinds of rod-like liquid crystal, in this segment applies specifically to materials with template designs. Generally, terminal groups which are polar and conjugated to the aromatic core be inclined to form nematic phases, whereas nonpolar not-conjugated groups lean toward forming smectic a and b. The studies mainly concentrated on nonpolar substituents to the terminal. Generally, terminal groups which are polar and conjugated to the aromatic core be inclined to form nematic phases, whereas nonpolar not-conjugated groups lean toward forming smectic a and b. The studies mainly concentrated on nonpolar substituents to the terminal. The present rod-shaped 1,2,4-triazine integrated imine compounds show various
mesophases like SmA, SmCa, and a few unidentified mesophases viz., SmX1, SmX2, etc. These chemicals exhibit a reversible photo-switching phenomenon that has important applications, according to preliminary tests.
References
Chandrasekhar S. Liquid Crystals, Cambridge University Press; 1992. doi: 10.1017/CBO9780511622496.
Demus D, Goodby J, Gray GW, Spiess H-W, Vill V. Handbook of Liquid Crystals, John Wiley & Sons, volume 1.1998. doi: 10.1002/9783527619276.
Demus D, Goodby JW, Gray GW, Spiess HW, Vill V. Handbook of Liquid Crystals, High Molecular Weight Liquid Crystals. John Wiley & Sons; 2008.
Reddy MK, Reddy KS, Yoga K, Prakash M, Narasimhaswamy T, Mandal AB et al.. Structural characterization and molecular order of rodlike mesogens with three- and four-ring core by XRD and 13C NMR spectroscopy. J Phys Chem B. 2013;117(18):5718–29. doi: 10.1021/jp4000126.
Hagar M, Ahmed HA, Saad GR. New calamitic thermotropic liquid crystals of 2-hydroxypyridine ester mesogenic core: mesophase behavior and DFT calculations. Liq Cryst. 2020;47(1):114–24. doi: 10.1080/02678292.2019.1631967.
Goodby JW, Gray GW. Some effects of small changes in the molecular framework on the incidence of smectic C and other smectic liquid crystal phases in esters. Mol Cryst Liq Cryst. 1976;37:157.
Pohl L, Eidenschink R, Krause G, Erdmann D. Physical properties of nematic phenylcyclohexanes, a new class of low melting liquid crystals with positive dielectric anisotropy. Phys Lett. 1977;60(5):421–3. doi: 10.1016/0375–9601(77)90040–8.
Hardouin F, Sigaud G, Nguyen Huu Tinh, Achard MF. A fluid smectic A antiphase in a pure nitro rod-like compound. J Phyique Lett. 1981;42(3):63–6. doi: 10.1051/jphyslet:0198100420306300.
Gray GW, McDonnell DG. The Relationship Between Helical Twist Sense, Absolute Configuration and Molecular Structure for Non-Sterol Cholesteric Liquid Crystals. Mol Cryst Liq Cryst. 1976;34(9):211–7. doi: 10.1080/15421407708083708.
Gray GW, Harrison KJ, Nash JA. A new family of nematic liquid crystals for displays. Electron Lett. 1973;9(6):130. doi: 10.1049/el:19730096.
Gray GW, Hird M, Lacey D, Toyne KJ. The synthesis and transition temperatures of some 4,400-dialkyl-1,10–40,100-terphenyls and 4,400-alkoxyalkyl-1,10–40,100-terphenyls with 2,3-difluoroor 20,30-difluoro substituents and of their biphenyl analogs. J Chem Soc Perk. Translator. 1989;2:2041.
Gray GW, Harrison KJ. Liquid crystalline properties of alkyl, aryl and arylalkyl 4-psubstituted-benzylideneamino-cinnamates and α-methylcinnamates. Mol Cryst Liq Cryst. 1971;13:37.
Goodby JW, Gray GW. Molecular structure and the polymorphism of smectic liquid crystals. J Phys Colloques. 1976;37(C3):C3–17. doi: 10.1051/jphyscol:1976303.
14Lai CK, Liu H-C, Li F-J, Cheng K-L, Sheu H. Heterocyclic benzoxazole-based liquid crystals. Liq Cryst. 2005;32(1, January):85–94. doi: 10.1080/02678290512331324048.
Xu Y, Chen X, Zhao F, Fan X, Chen P, An Z. Synthesis and properties of substituted benzoxazole-terminated liquid crystals. Liq Cryst. 2013;40(2):197–215. doi: 10.1080/02678292.2012.735709.
Ha S, Foo K. New thermotropic liquid crystals with benzoxazole core. In: Proceedings of the 15th international electronic conference on synthetic organic chemistry. Basel, Switzerland: MDPI; November 1–30 2011. doi: 10.3390/ecsoc-15–00747.
Thaker BT, Patel BS, Dhimmar YT, Solnki DB, Chothani NJ, Patel NB, et al. Synthesis, characterization and mesomorphic properties of new rod-like thiophene based liquid crystals. Mol Cryst Liq Cryst. 2012;562(1):98–113. doi: 10.1080/10426507.2012.673943.
Ha S, Koh T, Lin H, Yeap G, Win Y, Ong S, et al. Heterocyclic benzothiazole-based liquid crystals: synthesis and mesomorphic properties. Liq Cryst. 2009;36(9):917–25. doi: 10.1080/02678290903131278.
Ha S, Koh T, Yeap G, Lin H, Boey P, Win Y et al. Synthesis and Mesomorphic Properties of 2-(4-Alkyloxyphenyl)benzothiazoles. Mol Cryst Liq Cryst. 2009;506(1):56–70. doi: 10.1080/15421400902987347.
Al-Hamdani UJ, Abbo HS, Al-Jaber AA, Titinchi SJJ. New azo-benzothiazole based liquid crystals: synthesis and study of the effect of lateral substituents on their liquid crystalline behavior. Liq Cryst. 2020;47(14–15):2257–67. doi: 10.1080/02678292.2020.1766134.
Yeap G-Y, Alshargabi A, Ito MM, Mahmood WAK, Takeuchi D Ito. Synthesis and anisotropic properties of azo-bridged benzothiazole-phenyl esters. Mol Cryst Liq Cryst. 2012;557(1):126–33. doi: 10.1080/15421406.2011.637744.
Thaker BT, Patel BS, Dhimmar YT, Chothani NJ, Solanki DB, Patel N, et al. Mesomorphic studies of novel azomesogens having a benzothiazole core: synthesis and characterization. Liq Cryst. 2013;40(2):237–48. doi: 10.1080/02678292.2012.737478.
Li Y, Chen X, Chen P, An Z, Li J. Synthesis and mesomorphic properties of 7-alkoxybezopyrano[2,3-c]pyrazol-3-one. Liq Cryst. 2010;37(12):1549–57. doi: 10.1080/02678292.2010.527019.
Refbacks
- There are currently no refbacks.