Femtosecond Dynamics of the Methane - Methanol and Benzene - Phenol Conversions by an Iron - Oxo Species

Kazunari Yoshizawa, Yoshihito Shiota, Yoshihisa Kagawa, Tokio Yamabe

研究成果: ジャーナルへの寄稿学術誌査読

38 被引用数 (Scopus)

抄録

Femtosecond dynamic behavior of the methane - methanol conversion by the bare iron - oxo complex (FeO+) is presented using the B3LYP density-functional-theory (DFT) method. We propose that the reaction pathway for the direct methane - methanol conversion is partitioned into the H atom abstraction via a four-centered transition state and the methyl migration via a three-centered transition state. It is demonstrated that both the H atom abstraction and the methyl migration occur in a concerted manner in a time scale of 100 fs. The concerted H atom abstraction and the direct H atom abstraction via a transition state with a linear C - H O(Fe) array are compared. The direct H atom abstraction of methane is predicted to occur in a time scale of 50 fs. Isotope effects on the concerted and the direct H(D) atom abstractions are also computed and analyzed in the FeO+/methane system. Predicted values of the kinetic isotope effect (kH/kD) for the H(D) atom abstraction of methane are 9 in the concerted mechanism and 16 in the direct abstraction mechanism at 300 K. Dynamics calculations are also carried out on the benzene - phenol conversion by the FeO+ complex. The general profile of the electronic process of the benzene - phenol conversion is identical to that of the methane - methanol conversion with respect to essential bonding characters. It is demonstrated that the concerted H atom abstraction and the phenyl migration require 200 and 100 fs to be completed, respectively, in the FeO+/benzene system.

本文言語英語
ページ(範囲)2552-2561
ページ数10
ジャーナルJournal of Physical Chemistry A
104
12
DOI
出版ステータス出版済み - 3月 30 2000
外部発表はい

!!!All Science Journal Classification (ASJC) codes

  • 物理化学および理論化学

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