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A Technical Guide for Performing Spectroscopic Measurements on Metal-Organic Frameworks
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Synergistic DFT and temperature-dependent Raman profiling of fluorinated mesogens.

Kritika Garg1, Jakub Herman2, Chandan Bhai Patel3

  • 1Department of Physics, Manipal University Jaipur, Jaipur, 303007, India.

Scientific Reports
|June 27, 2026
PubMed
Summary

Raman spectroscopy reveals significant changes in liquid crystal molecular ordering near phase transitions. Density functional theory (DFT) calculations accurately predict these vibrational dynamics and spectral properties.

Keywords:
DFTLiquid crystalOrganic photoelectric devicesRaman

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Area of Science:

  • Materials Science
  • Condensed Matter Physics
  • Spectroscopy

Background:

  • Fluorinated liquid crystals (LCs) are vital for optoelectronics and display technologies.
  • Understanding their thermal-dependent vibrational dynamics is crucial for material design.
  • Raman spectroscopy offers insights into molecular structure and interactions.

Purpose of the Study:

  • To investigate the temperature-dependent Raman spectra of a nematic fluorinated liquid crystal.
  • To analyze vibrational dynamics and molecular ordering using Raman spectroscopy and DFT.
  • To correlate structural changes with vibrational properties near phase transitions.

Main Methods:

  • Experimental Raman spectroscopy was performed on 4'-butyl-4-(butylphenyl)ethynyl)-2,6-difluoro-1,1'-biphenyl.
  • Density functional theory (DFT) computations were utilized for theoretical Raman spectra analysis.
  • Polarizing optical microscopy (POM) was employed to observe structural changes.

Main Results:

  • High agreement was found between experimental and DFT-calculated Raman spectra.
  • Abrupt changes in Raman peak intensities and line widths were observed near 45°C and 95°C.
  • Peak merging and shifting at 50°C indicated disturbances in molecular ordering with increasing temperature.

Conclusions:

  • Raman spectroscopy effectively probes vibrational dynamics and molecular ordering in fluorinated LCs.
  • DFT calculations provide reliable theoretical support for experimental spectral assignments.
  • The study enhances understanding of structure-property relationships for advanced optoelectronic applications.