Theoretical study of the electronic ground state of iron(II) porphine

Yoong Kee Choe, Tomohiro Hashimoto, Haruyuki Nakano, Kimihiko Hirao

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41 Citations (Scopus)


Ten low-lying electronic states of Fe(II)-porphine, the 5A1g, 5Eg, 5B2g, 3A2g, 3B2g, 3Eg(A), 3Eg(B), 1A1g, 1B2g and 1Eg states, are studied with multireference Møller-Plesset perturbation theory with complete active space self-consistent field (CASSCF) reference functions. Triplet and singlet states are significantly multiconfigurational in character. The ten low-lying states are computed to be within a 2 eV span and the 5A1g state is predicted to be the lowest. At the CASSCF level, all the quintet states are lower in energy than the triplets. This tendency is reversed, except for the 5A1g state, after perturbation theory is applied. Among controversial candidates for the triplet ground state, the 3Eg state is computed to be more stable, by 0.18~0.23 eV, than the 3A2g and 3B2g states.

Original languageEnglish
Pages (from-to)380-388
Number of pages9
JournalChemical Physics Letters
Issue number4
Publication statusPublished - Oct 16 1998
Externally publishedYes

All Science Journal Classification (ASJC) codes

  • General Physics and Astronomy
  • Physical and Theoretical Chemistry


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