Exploring odd-even sensitivity in m.OnO.m liquid crystal compounds: A comprehensive study using DFT analysis

Abstract

In this article, a comprehensive investigation into a series of liquid crystalline compounds belonging to the α,ω-bis(4-alkylanilinebenzylidene-4′-oxy)alkane (m.OnO.m) family has been conducted to unravel their intricate molecular characteristics. The computational investigations employing DFT/B3LYP/6-311G(d,p) level delve into the odd–even effect, exploring how the presence of spacer units influences the structural, electronic, and vibrational properties of these compounds. Optimization analyses reveal the minimum energy configurations, offering valuable insights into spatial arrangements and symmetry. Visualization of molecular structures emphasizes a distinctive odd–even effect, with compounds exhibiting either U-shaped or Z-shaped configurations based on the parity of spacer units. Charge distribution maps further elucidate electronic intricacies, showcasing the interplay of charges among different atoms. Thermodynamic properties and frontier orbital analysis providing a nuanced understanding of the compounds behavior. NLO parameters exhibited a consistent odd–even effect. Potential Energy Distribution (PED), IR, and Raman spectra analysis, provided a detailed symphony of stretching, bending, and torsional motions. UV–Vis absorption spectra uncover distinctive electronic transitions within each compound. In essence, this research sheds light on the profound impact of spacer units, shaping the structural, electronic, and vibrational characteristics of the liquid crystalline compounds. The odd–even effect emerges as a central theme, weaving a captivating narrative of molecular dynamics within this intriguing class of materials.