Chem. J. Chinese Universities ›› 2012, Vol. 33 ›› Issue (06): 1285.doi: 10.3969/j.issn.0251-0790.2012.06.027

• Physical Chemistry • Previous Articles     Next Articles

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

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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