A valence bond model for aqueous Cu(II) and Zn(II) ions in the AMOEBA polarizable force field.
A valence bond model for aqueous Cu(II) and Zn(II) ions in the AMOEBA polarizable force field.
复制标题
AMOEBA 极化力场中水性 Cu(II) 和 Zn(II) 离子的价键模型。
DOI：
10.1002/jcc.23190
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发表时间：
2013
影响因子：
3
通讯作者：
Ponder,JayW
中科院分区：
文献类型：
--
作者：
Xiang,JinYu;Ponder,JayW
A general molecular mechanics (MM) model for treating aqueous Cu2+and Zn2+ions was developed based on valence bond (VB) theory and incorporated into the atomic multipole optimized energetics for biomolecular applications (AMOEBA) polarizable force field. Parameters were obtained by fitting MM energies to that computed byab initiomethods for gas‐phase tetra‐ and hexa‐aqua metal complexes. Molecular dynamics (MD) simulations using the proposed AMOEBA‐VB model were performed for each transition metal ion in aqueous solution, and solvent coordination was evaluated. Results show that the AMOEBA‐VB model generates the correct square‐planar geometry for gas‐phase tetra‐aqua Cu2+complex and improves the accuracy of MM model energetics for a number of ligation geometries when compared to quantum mechanical (QM) computations. On the other hand, both AMOEBA and AMOEBA‐VB generate results for Zn2+–water complexes in good agreement with QM calculations. Analyses of the MD trajectories revealed a six‐coordination first solvation shell for both Cu2+and Zn2+ions in aqueous solution, with ligation geometries falling in the range reported by previous studies. © 2012 Wiley Periodicals, Inc.
