Prediction of preferred protonation sites in pyrrole and its methyl derivatives using molecular electrostatic potentials derived from the PM3 and AM1 methods

Yasushi Nakajima, Yoshikatsu Sakagishi, Michio Shiibashi, Yuuji Suzuki, Hitoshi Kato

    Research output: Contribution to journalArticle

    9 Citations (Scopus)

    Abstract

    The PM3 and AM1 molecular orbital programs have been employed for the investigation of the preferred protonation sites in pyrrole and its N-methyl, 2,5-dimethyl, 3-methyl, 2-methyl and 1,2-dimethyl derivatives. The following are reported: the LCAO coefficients of the HOMO (2pz) (the HOMO coefficients); the atomic centered charges, which are calculated by the subroutine 'ESP' (ESP charges); the atomic net charges, which are obtained by a Mulliken population analysis (Mulliken net atomic charges). The predictions of the preferred protonation sites made by the HOMO coefficients and ESP charges are in perfect agreement with experimental data, whereas those made by the HOMO coefficients and Mulliken net atomic charges are not in agreement. It is hence obvious that the protonation of pyrrole and its methyl derivatives is controlled by not only HOMO-LUMO interaction but also by electrostatic forces, which are estimated by ESP charges. In other words, the subroutine 'ESP' is useful for estimation of a kind of electrostatic reaction of pyrrole and its methyl derivatives, which suggests that the subroutine may be effective for the investigation of the electrostatic reactions of other compounds.

    Original languageEnglish
    Pages (from-to)199-205
    Number of pages7
    JournalJournal of Molecular Structure: THEOCHEM
    Volume288
    Issue number3
    DOIs
    Publication statusPublished - 1993 Dec 13

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    Pyrroles
    Protonation
    Subroutines
    pyrroles
    Static Electricity
    subroutines
    Electrostatics
    electrostatics
    Derivatives
    coefficients
    predictions
    Electrostatic force
    Molecular orbitals
    molecular orbitals
    Population
    interactions

    ASJC Scopus subject areas

    • Physical and Theoretical Chemistry
    • Computational Theory and Mathematics
    • Atomic and Molecular Physics, and Optics

    Cite this

    Prediction of preferred protonation sites in pyrrole and its methyl derivatives using molecular electrostatic potentials derived from the PM3 and AM1 methods. / Nakajima, Yasushi; Sakagishi, Yoshikatsu; Shiibashi, Michio; Suzuki, Yuuji; Kato, Hitoshi.

    In: Journal of Molecular Structure: THEOCHEM, Vol. 288, No. 3, 13.12.1993, p. 199-205.

    Research output: Contribution to journalArticle

    Nakajima, Yasushi ; Sakagishi, Yoshikatsu ; Shiibashi, Michio ; Suzuki, Yuuji ; Kato, Hitoshi. / Prediction of preferred protonation sites in pyrrole and its methyl derivatives using molecular electrostatic potentials derived from the PM3 and AM1 methods. In: Journal of Molecular Structure: THEOCHEM. 1993 ; Vol. 288, No. 3. pp. 199-205.
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    abstract = "The PM3 and AM1 molecular orbital programs have been employed for the investigation of the preferred protonation sites in pyrrole and its N-methyl, 2,5-dimethyl, 3-methyl, 2-methyl and 1,2-dimethyl derivatives. The following are reported: the LCAO coefficients of the HOMO (2pz) (the HOMO coefficients); the atomic centered charges, which are calculated by the subroutine 'ESP' (ESP charges); the atomic net charges, which are obtained by a Mulliken population analysis (Mulliken net atomic charges). The predictions of the preferred protonation sites made by the HOMO coefficients and ESP charges are in perfect agreement with experimental data, whereas those made by the HOMO coefficients and Mulliken net atomic charges are not in agreement. It is hence obvious that the protonation of pyrrole and its methyl derivatives is controlled by not only HOMO-LUMO interaction but also by electrostatic forces, which are estimated by ESP charges. In other words, the subroutine 'ESP' is useful for estimation of a kind of electrostatic reaction of pyrrole and its methyl derivatives, which suggests that the subroutine may be effective for the investigation of the electrostatic reactions of other compounds.",
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    AU - Sakagishi, Yoshikatsu

    AU - Shiibashi, Michio

    AU - Suzuki, Yuuji

    AU - Kato, Hitoshi

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    N2 - The PM3 and AM1 molecular orbital programs have been employed for the investigation of the preferred protonation sites in pyrrole and its N-methyl, 2,5-dimethyl, 3-methyl, 2-methyl and 1,2-dimethyl derivatives. The following are reported: the LCAO coefficients of the HOMO (2pz) (the HOMO coefficients); the atomic centered charges, which are calculated by the subroutine 'ESP' (ESP charges); the atomic net charges, which are obtained by a Mulliken population analysis (Mulliken net atomic charges). The predictions of the preferred protonation sites made by the HOMO coefficients and ESP charges are in perfect agreement with experimental data, whereas those made by the HOMO coefficients and Mulliken net atomic charges are not in agreement. It is hence obvious that the protonation of pyrrole and its methyl derivatives is controlled by not only HOMO-LUMO interaction but also by electrostatic forces, which are estimated by ESP charges. In other words, the subroutine 'ESP' is useful for estimation of a kind of electrostatic reaction of pyrrole and its methyl derivatives, which suggests that the subroutine may be effective for the investigation of the electrostatic reactions of other compounds.

    AB - The PM3 and AM1 molecular orbital programs have been employed for the investigation of the preferred protonation sites in pyrrole and its N-methyl, 2,5-dimethyl, 3-methyl, 2-methyl and 1,2-dimethyl derivatives. The following are reported: the LCAO coefficients of the HOMO (2pz) (the HOMO coefficients); the atomic centered charges, which are calculated by the subroutine 'ESP' (ESP charges); the atomic net charges, which are obtained by a Mulliken population analysis (Mulliken net atomic charges). The predictions of the preferred protonation sites made by the HOMO coefficients and ESP charges are in perfect agreement with experimental data, whereas those made by the HOMO coefficients and Mulliken net atomic charges are not in agreement. It is hence obvious that the protonation of pyrrole and its methyl derivatives is controlled by not only HOMO-LUMO interaction but also by electrostatic forces, which are estimated by ESP charges. In other words, the subroutine 'ESP' is useful for estimation of a kind of electrostatic reaction of pyrrole and its methyl derivatives, which suggests that the subroutine may be effective for the investigation of the electrostatic reactions of other compounds.

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