Design-atom approach for the quantum mechanical/molecular mechanical covalent boundary: A design-carbon atom with five valence electrons

Chuanyun Xiao, Yingkai Zhang

Research output: Contribution to journalArticle

Abstract

A critical issue underlying the accuracy and applicability of the combined quantum mechanical/molecular mechanical (QM/MM) methods is how to describe the QM/MM boundary across covalent bonds. Inspired by the ab initio pseudopotential theory, here we introduce a novel design atom approach for a more fundamental and transparent treatment of this QM/MM covalent boundary problem. The main idea is to replace the boundary atom of the active part with a design atom, which has a different number of valence electrons but very similar atomic properties. By modifying the Troullier-Martins scheme, which has been widely employed to construct norm-conserving pseudopotentials for density functional calculations, we have successfully developed a design-carbon atom with five valence electrons. Tests on a series of molecules yield very good structural and energetic results and indicate its transferability in describing a variety of chemical bonds, including double and triple bonds.

Original languageEnglish (US)
Article number124102
JournalJournal of Chemical Physics
Volume127
Issue number12
DOIs
StatePublished - 2007

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Carbon
valence
Atoms
Electrons
carbon
pseudopotentials
atoms
electrons
Covalent bonds
Chemical bonds
covalent bonds
chemical bonds
norms
Density functional theory
Molecules
molecules

ASJC Scopus subject areas

  • Atomic and Molecular Physics, and Optics

Cite this

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