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Volumn 127, Issue 16, 2005, Pages 5840-5853

Toward identification of the compound I reactive intermediate in cytochrome P450 chemistry: A QM/MM study of its EPR and mössbauer parameters

Author keywords

[No Author keywords available]

Indexed keywords

COMPLEXATION; GROUND STATE; IRON OXIDES; PARAMAGNETIC RESONANCE; PROBABILITY DENSITY FUNCTION; PROTEINS; QUANTUM THEORY;

EID: 17744364713     PISSN: 00027863     EISSN: None     Source Type: Journal    
DOI: 10.1021/ja0424732     Document Type: Article
Times cited : (244)

References (104)
  • 17
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    • (c) Gao, J. In Reviews in Computational Chemistry; Lipkowitz, K. B., Boyd, D. B., Eds.; VCH: New York. 1996; Vol. 7, p 119.
    • (1996) Reviews in Computational Chemistry , vol.7 , pp. 119
    • Gao, J.1
  • 51
    • 17744369046 scopus 로고    scopus 로고
    • note
    • In contrast to the spin density, the electron density of the antiferromagnetic state is well described by the broken symmetry formalism; thus no spin projection had to be applied in the calculation of the Mössbauer parameters.
  • 52
    • 17744394231 scopus 로고    scopus 로고
    • Max-Planck Institut für Bioanorganische Chemie: Mülheim a. d. Ruhr, Germany
    • Neese, F. ORCA, version 2.4, revision 10; Max-Planck Institut für Bioanorganische Chemie: Mülheim a. d. Ruhr, Germany, 2004.
    • (2004) ORCA, Version 2.4, Revision 10
    • Neese, F.1
  • 57
    • 17744361810 scopus 로고    scopus 로고
    • note
    • For details about the generation and geometric features of the snapshot structures, nonstandard force field parameters, and QM/MM geometry optimizations, see ref 16 and Supporting Information thereof.
  • 73
    • 0942268401 scopus 로고    scopus 로고
    • The first calculation (LARGE-I) employed the Wachters basis on iron as before; however, the aug-TZVPP basis was applied to the oxo-oxygen and the TZVPP basis to the remaining heavy atoms. The hydrogens were described with the TZVP basis. The second calculation (LARGE-II) replaced the Wachters basis with a quadruple-ζ basis from the TurboMole library (Weigend F.; Furche, F.; Ahlrichs, R. J. Chem. Phys. 2003, 119, 12753). In addition, a second set of polarizing p-functions were added to the hydrogens. All polarization exponents were taken from the TurboMole library accessible at ftp://ftp.chemie.uni- karlsruhe.de/pub/basen (March 2005).
    • (2003) J. Chem. Phys. , vol.119 , pp. 12753
    • Weigend, F.1    Furche, F.2    Ahlrichs, R.3
  • 74
    • 17744377353 scopus 로고    scopus 로고
    • The first calculation (LARGE-I) employed the Wachters basis on iron as before; however, the aug-TZVPP basis was applied to the oxo-oxygen and the TZVPP basis to the remaining heavy atoms. The hydrogens were described with the TZVP basis. The second calculation (LARGE-II) replaced the Wachters basis with a quadruple-ζ basis from the TurboMole library (Weigend F.; Furche, F.; Ahlrichs, R. J. Chem. Phys. 2003, 119, 12753). In addition, a second set of polarizing p-functions were added to the hydrogens. All polarization exponents were taken from the TurboMole library accessible at ftp://ftp.chemie.uni- karlsruhe.de/pub/basen (March 2005).
  • 75
    • 17744396270 scopus 로고    scopus 로고
    • note
    • 6 were variationally treated. At this level, the quintet state is predicted to be 0.14 eV lower than the triplet state.
  • 83
    • 17744384239 scopus 로고    scopus 로고
    • note
    • -1, respectively. It is evident that the splitting is a sensitive function of the selection threshold and requires tight values for convergence.
  • 85
    • 0033652655 scopus 로고    scopus 로고
    • ∥). Experimentally, this species shows g-values that depend markedly on the environment of the radical and vary between 2.004 and 2.01 and thus confirm our statement. See, for example: (a) Dave, P. C.; Srivinas, D. J. Porphyrins Phthalocyanines 2000, 4, 192. (b) Dave, P. C.; Srivinas, D. J. Porphyrins Phthalocyanines 1997, 2, 243 and references therein.
    • (2000) J. Porphyrins Phthalocyanines , vol.4 , pp. 192
    • Dave, P.C.1    Srivinas, D.2
  • 86
    • 0006851466 scopus 로고    scopus 로고
    • and references therein
    • ∥). Experimentally, this species shows g-values that depend markedly on the environment of the radical and vary between 2.004 and 2.01 and thus confirm our statement. See, for example: (a) Dave, P. C.; Srivinas, D. J. Porphyrins Phthalocyanines 2000, 4, 192. (b) Dave, P. C.; Srivinas, D. J. Porphyrins Phthalocyanines 1997, 2, 243 and references therein.
    • (1997) J. Porphyrins Phthalocyanines , vol.2 , pp. 243
    • Dave, P.C.1    Srivinas, D.2
  • 90
    • 17744399894 scopus 로고    scopus 로고
    • Ph.D. Thesis, Universität Düsseldorf, Düsseldorf, Germany
    • Schöneboom, J. Ph.D. Thesis, Universität Düsseldorf, Düsseldorf, Germany, 2003.
    • (2003)
    • Schöneboom, J.1
  • 94
    • 17744371417 scopus 로고    scopus 로고
    • note
    • Judging from the results obtained for 4 and 5, this prediction should be viewed with some caution.
  • 95
    • 17744362627 scopus 로고    scopus 로고
    • note
    • This should not be confused with the spin contamination present in spin-unrestricted Hartree-Fock or DFT calculations. The mixing of different spin states is brought about by the SOC which is parametrized through the ZFS tensor in the spin-Hamiltonian treatment. Thus, this mixing represents a real physical effect and not an artifact of a computational method.


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