Spectroscopic notes of Methyl Red (MR) dye

Area of Science:

• Computational chemistry
• Molecular spectroscopy
• Materials science

Background:

• Understanding molecular properties is crucial for designing new materials.
• Fourier-transform infrared (FT-IR) spectroscopy provides insights into molecular vibrations.
• Density Functional Theory (DFT) is a powerful tool for predicting molecular structures and properties.

Purpose of the Study:

• To investigate the molecular structure and vibrational frequencies of MR.
• To evaluate the potential of MR for applications in optoelectronic devices.
• To correlate experimental FT-IR data with theoretical calculations.

Main Methods:

• Experimental: FT-IR spectroscopy in the solid phase.
• Theoretical: DFT/B3LYP calculations using the 6-311G(d,p) basis set.
• Calculated properties include equilibrium geometries, harmonic vibrational frequencies, thermo-chemical parameters, total dipole moment, and HOMO-LUMO energies.

Main Results:

• The FT-IR spectrum of MR was successfully recorded.
• Theoretical calculations provided equilibrium geometries and vibrational frequencies.
• MR exhibits a high calculated dipole moment (7.2 Debye) and a low HOMO-LUMO energy gap (3.5 eV).

Conclusions:

• MR possesses favorable electronic and structural properties.
• The high dipole moment and low energy gap suggest potential for optoelectronic applications.
• The combined experimental and theoretical approach validates the predicted properties of MR.