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Δ Self-Consistent Field Method for Natural Anthocyanidin Dyes.

U Terranova1,2, D R Bowler1,2

  • 1Department of Physics and Astronomy, University College London , London WC1E 6BT, U.K.

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|November 20, 2015
PubMed
Summary
This summary is machine-generated.

We applied the Delta self-consistent field (ΔSCF) method to study excited states in anthocyanidin dyes. This method allows atomic structure relaxation in excited states, showing important geometry changes upon adsorption on TiO2 surfaces.

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Area of Science:

  • Computational chemistry
  • Materials science
  • Photochemistry

Background:

  • Anthocyanidin dyes are crucial for applications like dye-sensitized solar cells.
  • Understanding excited states is key to optimizing dye performance.
  • Accurate theoretical methods are needed to study excited-state dynamics and geometry.

Purpose of the Study:

  • To implement and test the Delta self-consistent field (ΔSCF) method within the DFT code CONQUEST for excited-state calculations.
  • To investigate the excited-state geometry relaxation of anthocyanidin dyes.
  • To study the effect of adsorption on TiO2 surfaces on the electronic and geometric properties of cyanidin.

Main Methods:

  • Implementation and application of the ΔSCF method in the CONQUEST DFT code.
  • Calculation of vertical excitation energies for gas-phase anthocyanidins.
  • Comparison with time-dependent density functional theory (TDDFT) and experimental data.
  • Adsorption of cyanidin on a TiO2 anatase (101) surface to model a dye-sensitized solar cell interface.

Main Results:

  • The ΔSCF method successfully allows for atomic structure relaxation in excited states by following gradients on the excited Born-Oppenheimer surface.
  • Vertical excitation energies of gas-phase anthocyanidins were computed and compared favorably with TDDFT and experimental results.
  • Adsorption of cyanidin on TiO2 significantly shifted the lowest excitation energy.
  • Crucial modifications in the excited-state geometry of adsorbed cyanidin were observed.

Conclusions:

  • The ΔSCF method is a valuable tool for studying excited states and geometry relaxation in molecular systems.
  • The study provides insights into the behavior of anthocyanidin dyes at interfaces relevant to solar cell technology.
  • The findings highlight the importance of considering excited-state geometry changes for dye performance optimization.