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Electronic and electro-optical properties of 5CB and 5CT liquid crystal molecules: A comparative DFT study

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Abstract

In the present work, electro-optical and electronic properties of 4-n-pentyl-\(4^{\prime }\)-cyanobiphenyl (5CB) and \(4^{\prime }\)-cyano-4-n-pentyl-p-terphenyl (5CT) liquid crystal molecules have been investigated. The 5CB compound transforms from crystal to nematic phase at 24\(^\circ \)C and nematic to isotropic phase at 35.3\(^\circ \)C while 5CT compound transforms from crystal to nematic phase at 130\(^\circ \)C and nematic to isotropic phase at 239\(^\circ \)C. Molecular geometry of 5CB and 5CT have been optimised by DFT method with 6-31G(d,p) basis set. Binding energies acting between dimers have been calculated. Mulliken and natural population analyses have been done. The HOMO–LUMO surfaces, molecular and thermodynamic properties have been examined. The excitation energy and oscillator strength have been calculated by TD-DFT/B3LYP/6-31G(d,p) method. All the investigated parameters of 5CT have been compared with that of 5CB molecule. Results have been used to elucidate the electro-optical and electronic properties of 5CB and 5CT molecules.

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Acknowledgements

D Sharma acknowledges University Grants Commission (UGC), New Delhi, India for awarding a Start Up Project Grant [F.30-505/2020(BSR)].

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Authors and Affiliations

  1. Department of Physics, DDU Gorakhpur University, Gorakhpur,  273009, India

    Dipendra Sharma & Sugriva Nath Tiwari

  2. Department of Physics, Patna University, Patna,  800 005, India

    Gargi Tiwari

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  1. Dipendra Sharma
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  2. Gargi Tiwari
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  3. Sugriva Nath Tiwari
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Correspondence to Dipendra Sharma.

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Sharma, D., Tiwari, G. & Tiwari, S.N. Electronic and electro-optical properties of 5CB and 5CT liquid crystal molecules: A comparative DFT study. Pramana - J Phys 95, 71 (2021). https://doi.org/10.1007/s12043-021-02114-z

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  • DOI: https://doi.org/10.1007/s12043-021-02114-z

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