Comparative Raman study of two laterally fluorinated LC compounds having different terminal chains

References

• Bulkin BJ, Prochaska FT. Vibrational spectra of liquid crystals. II. The Raman spectrum of p azoxyanisole in crystal, nematic, and isotropic phases. J Chem Phys. 1971;54:635.
   Web of Science ®Google Scholar
• Weber A. Raman spectroscopy of gases and liquids. New York: Springer- Verlag; 1979.
   Google Scholar
• Bhattacharjee A, Alapati PR, Verma AL. Dynamics of phase transitions in a liquid crystal probed by Raman spectroscopy. Liq Cryst. 2001;28(9):1315–1320.
   Web of Science ®Google Scholar
• Vikram K, Alapati PR, Singh RK. Temperature dependent Raman study of SB→SC transition in liquid crystalline compound N-(4-n-pentyloxybenzylidene)-4ʹheptylaniline (5O.7). Spectrochim Acta. 2010;A(75):1480–1485.
   Google Scholar
• Lim JK, Kwon O, Kang DS, et al. Raman spectroscopy study and density functional theory calculations of the nematic liquid crystal 4-n-pentyl-4ʹ-cyanobiphenyl under an electric field. Chem Phys Lett. 2006;423:178–182.
   Web of Science ®Google Scholar
• Schnur JM. Raman spectral evidence for conformational changes in the liquid-crystal homologous series of the alkoxyazoxybenzenes. Phys Rev Lett. 1972;29:1141.
   Web of Science ®Google Scholar
• Sahamir SR, Said SM, Sabri MFM, et al. Studies on relation between columnar order and electrical conductivity in HAT6 discotic liquid crystals using temperature-dependent Raman spectroscopy and DFT calculations. Liq Cryst. 2018;45(4):522–535.
   Web of Science ®Google Scholar
• Mishra R, Bhattacharjee A, Bhattacharjee D, et al. Temperature-dependent vibrational spectroscopic studies of pure and gold nanoparticles dispersed 4-n-Hexyloxy-4ʹ-cyanobiphenyls. Liq Cryst. 2018;45(9):1333–1341.
   Web of Science ®Google Scholar
• Dash SK, Singh RK, Alapati PR, et al. Laser Raman study of terepthalylidene-bis-p-n-decylaniline (TBDA). Mol Cryst Liq Cryst. 1997;319:147–148.
   Web of Science ®Google Scholar
• Pogorelov VY, Estrela-Llopis IB. Structural peculiarities and phase transitions of MBBA with different thermal pre-history. Mol Cryst Liq Cryst. 1995;265:237–248.
   Web of Science ®Google Scholar
• Chen Y, Xianyu H, Sun J, et al. Low absorption liquid crystals for mid-wave infrared applications. Opt Express. 2011;19(11):10843–10848.
   PubMed Web of Science ®Google Scholar
• Parish A, Gauza S, Wu ST. New fluorinated terphenyl isothiocyanate liquid crystal single compounds and mixtures. Mol Cryst Liq Cryst. 2008;489:348–365.
   Web of Science ®Google Scholar
• Song Q, Gauza S, Xianyu H, et al. High birefringence lateral difluoro phenyl tolane liquid crystals. Liq Cryst. 2010;37:139–147.
   Web of Science ®Google Scholar
• Dziaduszek J, Dabrowski R, Urban S, et al. Selected fluorosubstituted phenyltolanes with a terminal group: NCS, CN, F, OCF3 and their mesogenic and dielectric properties and use for the formulation of high birefringence nematic mixtures to GHz and THz applications. Liq Cryst. 2017;44(8):1277–1292.
   Web of Science ®Google Scholar
• Herman J, Kula P. Design of new super-high birefringent isothiocyanato bistolanes - synthesis and properties. Liq Cryst. 2017;44(9):1462–1467.
   Web of Science ®Google Scholar
• Dabrowski R, Dziaduszek J, Garbat K, et al. Synthesis and mesogenic properties of three- and four-ring compounds with a fluoroisothiocyanatobiphenyl moiety. Liq Cryst. 2010;37:1529–1537.
   Web of Science ®Google Scholar
• Chen Y, Sun J, Xianyu H, et al. High birefringence fluoro-terphenyls for thin-cell-gap TFT-LCDs. J Disp Technol. 2011;7(9):478–481.
   Google Scholar
• Liu Y, Ma H, Xu H, et al. Molecular configuration and the dipole moment in fluorinated liquid crystals. Int J Q Chem. 2005;102:353–470.
   Web of Science ®Google Scholar
• Pramanik A, Das B, Das M, et al. Mesomorphic, optical, dielectric, elastic and viscous properties of multi-component isothiocyanato mixtures. Liq Cryst. 2013;40:149–158.
   Web of Science ®Google Scholar
• Thingujam K, Bhattacharjee A, Choudhury B, et al. Nematic liquid crystals exhibiting high birefringence. Opt Rev. 2016;23:409–419.
   Web of Science ®Google Scholar
• Pogorelov VY, Estrela-Llopis IB. Vibrational spectroscopy of structure transformation in two isomers of mezogenic 4-alcoxyphenyl-4′-alcoxybenzoates. J Mol Struct. 2012;1021:22–28.
   Web of Science ®Google Scholar
• Upadhyay P, Rastogi MK, Kumar D. Polarizability study of nematic liquid crystal 4-cyano-4′-pentylbiphenyl (5CB) and its nitrogen derivatives. Chem Phys. 2015;456:41–46.
   Web of Science ®Google Scholar
• Druzbicki K, Mikuli E, Ossowska-Chruściel MD. Experimental (FT-IR, FT-RS) and theoretical (DFT) studies of vibrational dynamics and molecular structure of 4-n-pentylphenyl-4′-n-octyloxythiobenzoate (8OS5). Vib Spectrosc. 2010;52:54–62.
   Web of Science ®Google Scholar
• Becke AD. Density-functional thermochemistry. III. The role of exact exchange. J Chem Phys. 1993;98:5648–5652.
   Web of Science ®Google Scholar
• Lee C, Yang W, Parr RG. Development of the Colle-Salvetti correlation-energy formula into a functional of the electron density. Phys Rev B. 1988;37:785–789.
   PubMed Web of Science ®Google Scholar
• Karabacak M, Cinar M. FT-IR, FT-Raman, UV spectra and DFT calculations on monomeric and dimeric structure of 2-amino-5-bromobenzoic acid. Spectrochim Acta Part A. 2012;86:590–599.
   PubMed Web of Science ®Google Scholar
• Ham NS, Willis JB. The vibrational spectra of organic isothiocyanates. Spectrochim Acta. 1960;16:279–291.
   Web of Science ®Google Scholar
• Tang H, Sun S, Wu J, et al. Conformational changes in novel thermotropic liquid crystalline polymer without conventional mesogens: A Raman spectroscopic investigation. Polymer. 2010;51:5482–5489.
   Web of Science ®Google Scholar