Abstract
The homologous series of 4-cyano-4'-phenyl-phenol-alkanoates (nCOOCB) was studied under the influence of terahertz (THz) frequency range. The nCOOCB series has a re-entrant nematic phase, which is suitable for electro-optical properties under the THz frequency. The birefringence and order parameter expresses the twisting of the nematic phase at the higher frequency range. The director angle has fluctuated at a higher frequency range. The refractive index has remained constant at a higher frequency. The ionisation potential, electron affinity and Homo-Lumo energy gap continuously decrease with an extension of alkyl chain length; however, the dipole moment increases. The Homo-Lumo energy bandgap is reciprocal to the dipole moment.
Highlights
The nitrile (CN) group and nitrogen oxide (NO2) are used as the common polar groups in the liquid crystal (LC) molecules
The alkoxy and alkylamino biphenyl groups enhance the nematic to isotropic (N-I) transition temperature due to the electron-donating behaviour, and the molecular charge and polarizability are increased by the LC.[5]
The homologous series of nCOOCB is more suitable for the THz applications because all the optical parameters are affected under the impact of the THz frequency range, as given in the subsequent discussion
Summary
The nitrile (CN) group and nitrogen oxide (NO2) are used as the common polar groups in the liquid crystal (LC) molecules. The alkyl chain length is used as the non-polar group. The alkyl or alkoxy derivatives contribute to the smectic phase.[1,2] The non-polar LCs are stable by the alkyl chain length, which increases the thermal geometry of the mesophase. The thermal substitutions of the LCs affect the stability of the mesophase. The molecular packing and intermolecular forces are affected by the cause of charge distribution of the whole molecule.[3,4] The alkoxy and alkylamino biphenyl groups are mostly having higher nematic to isotropic (N-I) transition temperature in comparison with the alkyl derivates. The alkoxy and alkylamino biphenyl groups enhance the N-I transition temperature due to the electron-donating behaviour, and the molecular charge and polarizability are increased by the LC.[5]
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