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Frozen-Density Embedding Potentials and Chiroptical Properties.

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  • 1Department of Chemistry, Virginia Tech , Blacksburg, Virginia 24061, United States.

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|November 18, 2015
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Summary
This summary is machine-generated.

The frozen density embedding (FDE) method shows limitations in simulating solvent effects on chiroptical properties. It often underestimates solvent-induced shifts and fails to capture sign changes in optical rotation, particularly due to insufficient solvent response.

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Area of Science:

  • Computational Chemistry
  • Quantum Chemistry
  • Spectroscopy

Background:

  • Accurate simulation of solvent effects is crucial for understanding molecular properties.
  • Chiroptical properties, such as specific rotation and circular dichroism, are sensitive to the molecular environment.
  • Frozen Density Embedding (FDE) offers a hybrid approach combining wave function theory (WFT) and density functional theory (DFT).

Purpose of the Study:

  • To evaluate the efficacy of the WFT-in-DFT FDE approach for simulating solvent effects on chiroptical properties.
  • To investigate the accuracy of FDE in predicting specific rotation and circular dichroism spectra.
  • To analyze the sources of error in FDE simulations of solvent-solute interactions.

Main Methods:

  • The study employed a wave function-theory-in-density-functional-theory (WFT-in-DFT) FDE approach.
  • Simulations focused on (P)-dimethylallene interacting with up to three water molecules.
  • Optical response calculations utilized coupled cluster linear response theory for mixed electric and magnetic field perturbations.

Main Results:

  • The FDE approach generally underestimated the solvent-induced shifts in chiroptical properties compared to explicit solvent models.
  • In one instance, FDE failed to reproduce a sign change in the optical rotatory dispersion (ORD) spectrum.
  • Errors were attributed primarily to the lack of solvent response to external fields and solvent-solute charge transfer excitations.

Conclusions:

  • The WFT-in-DFT FDE method has limitations in accurately capturing solvent effects on chiroptical properties.
  • The insufficient solvent response within the FDE framework is a key factor limiting its accuracy.
  • Further development is needed to improve the FDE approach for reliable prediction of solvent-dependent chiroptical phenomena.