Chemically intuitive indices for charge-transfer excitation based on SAC-CI and TD-DFT calculations

Authors

  • Masahiro Ehara,

    Corresponding author
    1. Institute for Molecular Science and Research Center for Computational Science, Myodaiji, Okazaki, Japan
    2. Elements Strategy Initiative for Catalysts and Batteries (ESICB), Kyoto University Katsura, Kyoto, Japan
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  • Ryoichi Fukuda,

    1. Institute for Molecular Science and Research Center for Computational Science, Myodaiji, Okazaki, Japan
    2. Elements Strategy Initiative for Catalysts and Batteries (ESICB), Kyoto University Katsura, Kyoto, Japan
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  • Carlo Adamo,

    1. LECIME, Laboratoire d'Electrochimie, Chimie des Interfaces et Modélisation pour l′Energie, UMR 7575 CNRS, Ecole Nationale Supérieure de Chimie de Paris–Chimie ParisTech, Paris Cedex 05, France
    2. Institut Universitaire de France, Paris, France
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  • Ilaria Ciofini

    1. LECIME, Laboratoire d'Electrochimie, Chimie des Interfaces et Modélisation pour l′Energie, UMR 7575 CNRS, Ecole Nationale Supérieure de Chimie de Paris–Chimie ParisTech, Paris Cedex 05, France
    2. Institut Universitaire de France, Paris, France
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Abstract

A recently proposed charge-transfer (CT) index and some related quantities aimed to the description of CT excitations in push–pull donor–acceptor model systems were computed in vacuum and in ethanol by the direct symmetry-adapted cluster-configuration interaction (SAC-CI) method including solvent effects by means of the nonequilibrium state-specific approach. The effects of both solvation and electron correlations on these quantities were found to be significant. The present results are also in line with previous time-dependent (TD) density functional theory calculations and they demonstrate that SAC-CI provides a description of the excitation character close to that of TD-PBE0. Indeed, CT indices evaluated by the SAC-CI and TD-PBE0 would be useful in the field of materials chemistry, for the design and development of novel molecular materials. © 2013 Wiley Periodicals, Inc.

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