高等学校化学学报 ›› 2012, Vol. 33 ›› Issue (06): 1285.doi: 10.3969/j.issn.0251-0790.2012.06.027

• 物理化学 • 上一篇    下一篇

Lindqvist型[M6-n Mon O19 ]p- 阴离子(M=W,Nb,Ta)电子性质的密度泛函理论研究

桑园美, 颜力楷, 温世正, 丛莎, 苏忠民   

  1. 东北师范大学化学学院, 功能材料化学研究所, 长春 130024
  • 收稿日期:2011-10-20 出版日期:2012-06-10 发布日期:2012-06-10
  • 通讯作者: 颜力楷, 女, 博士, 副教授, 博士生导师, 主要从事量子化学研究; 苏忠民, 男, 博士, 教授, 博士生导师, 主要从事功能材料和量子化学研究 E-mail:yanlk924@nenu.edu.cn
  • 基金资助:

    国家自然科学基金(批准号: 20971020, 21073030)和海南师范大学省部共建-热带药用植物化学教育部重点实验室开放课题基金(批准号: 201101)资助.

Density Functional Theoretical Study on Electronic Properties of Lindquist-type Anions [M6-nMonO19]p-(M=W, Nb, Ta)

SANG Yuan-Mei, YAN Li-Kai, WEN Shi-Zheng, CONG Sha, SU Zhong-Min   

  1. Institute of Functional Material Chemistry, Faculty of Chemistry, Northeast Normal University, Changchun 130024, China
  • Received:2011-10-20 Online:2012-06-10 Published:2012-06-10

摘要: 采用密度泛函理论方法探讨了取代Mo原子对[W6-nMonO19]2-, [Nb6-nMonO19]p-和[Ta6-nMonO19]p-体系的M-Ot(M=W, Nb, Ta)键的活化作用. 计算结果表明, 随着取代Mo原子数的增多, [M6-nMonO19]2-(M=W, Nb, Ta)中M-Ot键的键能逐渐减小, 因此Mo原子的引入使M-Ot键活化. 在[W6-nMonO19]2-中, Mo-Ot键的键能小于W-Ot键的键能, 因此, Mo-Ot键比W-Ot键易断裂, 与实验结果一致. 而在[Nb6-nMonO19]p-和[Ta6-nMonO19]p-体系中, Mo-Ot键的键能大于M-Ot(M=Nb, Ta)键的键能. Nb和Ta原子的端氧Ot的电荷大于Mo原子的端氧Ot的电荷, 初步预测, 当[Nb6-nMonO19]p-和[Ta6-nMonO19]p-与有机胺反应时, Nb-Ot和Ta-Ot键优先断裂, 易与有机胺的氮原子成键.

关键词: Lindqvist型多酸衍生物, 电子性质, 自然键轨道分析, 密度泛函理论

Abstract: The activated effect of Mo atom on the bond of M-Ot(M=W, Nb, Ta) of substituted systems [W6-nMonO19]2-, [Nb6-nMonO19]p- and [Ta6-nMonO19]p- was investigated by density functional theory(DFT) method. The results show that the bonding energy of M-Ot in [M6-nMonO19]2-(M=W, Nb, Ta) decrease with the increasing number of Mo atom. Therefore, the M-Ot bond was activated when Mo atom was introduced. While the Mo-Ot bonding energy is less than that of W-Ot, the Mo-Ot bond is easily broken than the W-Ot bond, which was in well agreement with experimental results. For systems [Nb6-nMonO19]p- and [Ta6-nMonO19]p-, the bonding energy of Mo-Ot is larger than that of M-Ot bond(M=Nb, Ta). The natural charges on terminal oxygen of Nb-Ot and Ta-Ot are larger than that of terminal oxygen of Mo-Ot. It predicts that Nb-Ot and Ta-Ot prefer to be broken, and easily form Nb≡ ≡N bond and Ta≡ ≡N bond when [Nb6-nMonO19]p- and [Ta6-nMonO19]p- react with organic amines.

Key words: Lindqvist-type derivative of polyoxometalate, Electronic property, Natural bond orbital analysis, Density functional theory

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