中国物理B ›› 2012, Vol. 21 ›› Issue (9): 93102-093102.doi: 10.1088/1674-1056/21/9/093102

• ATOMIC AND MOLECULAR PHYSICS • 上一篇    下一篇

Density functional study of uranyl (VI) amidoxime complexes

匙芳廷a b, 李鹏c, 熊洁a, 胡胜a, 高涛c, 夏修龙a, 汪小琳a b   

  1. a Institute of Nuclear Physics and Chemistry, China Academy of Engineering Physics, Mianyang 621900, China;
    b College of Chemistry, Sichuan University, Chengdu 610064, China;
    c Institute of Atomic and Molecular Physics, Sichuan University, Chengdu 610065, China
  • 收稿日期:2011-12-12 修回日期:2012-04-26 出版日期:2012-08-01 发布日期:2012-08-01
  • 基金资助:
    Project supported by the Science and Technology Development Foundation of China Academy of Engineering Physics (Grant No. 2011A0301003).

Density functional study of uranyl (VI) amidoxime complexes

Chi Fang-Ting (匙芳廷)a b, Li Peng (李鹏)c, Xiong Jie (熊洁)a, Hu Sheng (胡胜)a, Gao Tao (高涛)c, Xia Xiu-Long (夏修龙)a, Wang Xiao-Lin (汪小琳)a b   

  1. a Institute of Nuclear Physics and Chemistry, China Academy of Engineering Physics, Mianyang 621900, China;
    b College of Chemistry, Sichuan University, Chengdu 610064, China;
    c Institute of Atomic and Molecular Physics, Sichuan University, Chengdu 610065, China
  • Received:2011-12-12 Revised:2012-04-26 Online:2012-08-01 Published:2012-08-01
  • Contact: Wang Xiao-Lin E-mail:xlwang@caep.ac.cn
  • Supported by:
    Project supported by the Science and Technology Development Foundation of China Academy of Engineering Physics (Grant No. 2011A0301003).

摘要: Uranyl (VI) amidoxime complexes are investigated using relativistic density functional theory. The equilibrium structures, bond orders, and Mulliken populations of the complexes have been systematically investigated under a generalized gradient approximation (GGA). Comparison of (acet) uranyl amidoxime complexes ([UO2(AO)n]2-n, 1 ≤ n ≤ 4) with available experimental data shows an excellent agreement. In addition, the U-O(1), U-O(3), C(1)-N(2), and C(3)-N(4) bond lengths of [UO2(CH3AO)4]2- are longer than experimental data by about 0.088, 0.05, 0.1, and 0.056 Å. The angles of N(3)-O(3)-U, O(2)-N(1)-C(1), N(3)-C(3)-N(4), N(4)-C(3)-C(4), and C(4)-C(3)-N(3) are different from each other, which are due to existing interaction between oxygen in uranyl and hydrogen in amino group. This interaction is found to be intra-molecular hydrogen bond. Studies on the bond orders, Mulliken charges, and Mulliken populations demonstrate that uranyl oxo group functions as hydrogen-bond acceptors and H atoms in ligands act as hydrogen-bond donors forming hydrogen bands within the complex.

关键词: uranyl amidoxime complexes, intra-molecular hydrogen bonds, bond order, Mulliken populations

Abstract: Uranyl (VI) amidoxime complexes are investigated using relativistic density functional theory. The equilibrium structures, bond orders, and Mulliken populations of the complexes have been systematically investigated under a generalized gradient approximation (GGA). Comparison of (acet) uranyl amidoxime complexes ([UO2(AO)n]2-n, 1 ≤ n ≤ 4) with available experimental data shows an excellent agreement. In addition, the U-O(1), U-O(3), C(1)-N(2), and C(3)-N(4) bond lengths of [UO2(CH3AO)4]2- are longer than experimental data by about 0.088, 0.05, 0.1, and 0.056 Å. The angles of N(3)-O(3)-U, O(2)-N(1)-C(1), N(3)-C(3)-N(4), N(4)-C(3)-C(4), and C(4)-C(3)-N(3) are different from each other, which are due to existing interaction between oxygen in uranyl and hydrogen in amino group. This interaction is found to be intra-molecular hydrogen bond. Studies on the bond orders, Mulliken charges, and Mulliken populations demonstrate that uranyl oxo group functions as hydrogen-bond acceptors and H atoms in ligands act as hydrogen-bond donors forming hydrogen bands within the complex.

Key words: uranyl amidoxime complexes, intra-molecular hydrogen bonds, bond order, Mulliken populations

中图分类号:  (Applications of density-functional theory (e.g., to electronic structure and stability; defect formation; dielectric properties, susceptibilities; viscoelastic coefficients; Rydberg transition frequencies))

  • 31.15.es
21.60.Jz (Nuclear Density Functional Theory and extensions (includes Hartree-Fock and random-phase approximations))