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DFT-Assisted Polymorph Identification from Lattice Raman Fingerprinting.

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Summary

This study introduces a combined experimental and theoretical method using Raman spectroscopy and density functional theory (DFT) for lattice dynamics. The approach accurately identifies molecular polymorphs and characterizes lattice vibrations.

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Area of Science:

  • Solid-state chemistry
  • Computational materials science
  • Spectroscopy

Background:

  • Polymorphism significantly impacts material properties.
  • Accurate characterization of lattice dynamics is crucial for understanding material behavior.
  • Experimental techniques like Raman spectroscopy provide valuable insights but can be complex to interpret.

Purpose of the Study:

  • To develop and validate a combined experimental and theoretical approach for lattice dynamics characterization.
  • To establish a reliable method for polymorph phase identification using spectroscopic and computational tools.
  • To investigate the lattice phonon Raman spectra of 2,7-dioctyloxy[1]benzothieno[3,2-b]benzothiophene polymorphs.

Main Methods:

  • Lattice phonon Raman spectroscopy was employed for experimental analysis.
  • Density functional theory (DFT) calculations were utilized for theoretical modeling.
  • Many-body dispersion van der Waals (MBD-vdW) corrections were incorporated into DFT calculations for improved accuracy.

Main Results:

  • The combined DFT and Raman spectroscopy method accurately predicted experimental lattice vibration data.
  • Calculated lattice vibration frequencies showed an accuracy of less than 5 cm-1 (0.6 meV) compared to experimental results.
  • The method successfully distinguished between different polymorphs of the target molecule.

Conclusions:

  • The proposed DFT-MBD-vdW approach is highly reliable for lattice dynamics characterization and polymorph identification.
  • This method provides unambiguous identification of polymorphs and detailed characterization of lattice vibrations.
  • The findings suggest DFT-MBD-vdW is a promising tool for predicting other lattice dynamics-dependent properties, such as charge transport.