Nonuniform continuum model for solvatochromism based on frozen-density embedding theory

Area of Science:

• Computational chemistry
• Quantum mechanics
• Theoretical chemistry

Background:

• Frozen-density embedding theory (FDET) is a multilevel method for simulating complex systems.
• FDET typically uses lower-level quantum mechanical methods to obtain the environment's frozen density.
• Existing FDET methods have limitations in describing solute-solvent interactions accurately.

Purpose of the Study:

• To apply FDET using statistically averaged solvent electron densities.
• To develop an approximate coupling scheme for FDET applicable to both absorption and emission.
• To accurately predict solvatochromic shifts in molecular systems.

Main Methods:

• Utilized FDET with statistically averaged electron density of the solvent.
• Developed an approximate coupling protocol between solute and solvent descriptors.
• Applied the method to calculate absorption and emission spectra of solvated chromophores.

Main Results:

• The proposed FDET protocol accurately describes solute-solvent interactions statistically.
• Achieved high accuracy (within 0.05 eV error) for solvatochromic shifts.
• The method is applicable to both absorption and emission processes.

Conclusions:

• FDET with averaged solvent density offers a computationally efficient and accurate approach.
• The developed coupling scheme effectively captures electronic spectral shifts in solution.
• This method provides a reliable tool for studying solvated molecules.