Assessment and validation of density functional approximations for iron carbide and iron carbide cation

Ruifang Li, Roberto Peverati, Miho Isegawa, Donald G. Truhlar

研究成果: Contribution to journalArticle査読

20 被引用数 (Scopus)

抄録

Using quantum chemical approximations to understand and predict complex transition metal chemistry, such as catalytic processes and materials properties, is an important activity in modern computational chemistry. High-level theory can sometimes provide high-precision benchmarks for systems containing transition metals, and these benchmarks can be used to understand the reliability of less expensive quantum chemical approximations that are applicable to complex systems. Here, we studied the ionization potential energy of Fe and FeC and the bond dissociation energies of FeC and FeC+ by 15 density functional approximations: M05, M06, M06-L, ωB97, ωB97X, ωB97X-D, τ-HCTHhyb, BLYP, B3LYP, M08-HX, M08-SO, SOGGA11, SOGGA11-X, M11, and M11-L. All of the functionals predict the correct spin state as the ground state of neutral iron atom, but five of them predict the wrong spin state for Fe+. In the final analysis, four functionals, namely M11-L, τ-HCTHhyb, SOGGA11, and M06-L, have small mean unsigned errors when averaged over two bond dissociation energies and two ionization potentials. In fact, the results show that M11-L gives the smallest averaged mean unsigned error, i.e., M11-L is the most reliable density functional for these iron carbide systems among those studied.

本文言語英語
ページ(範囲)169-173
ページ数5
ジャーナルJournal of Physical Chemistry A
117
1
DOI
出版ステータス出版済み - 1 10 2013
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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