A G3 Study of the Structure of Carbon−Nitrogen Nanoclusters

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• 作者：Muneerah M. Al Mogren ; Adel A. El-Azhary ; Wad Z. Alkiali ; Majdi Hochlaf
• 刊名：Journal of Physical Chemistry A
• 出版年：2010
• 出版时间：November 25, 2010
• 年：2010
• 卷：114
• 期：46
• 页码：12258-12268
• 全文大小：266K
• 年卷期：v.114,no.46(November 25, 2010)
• ISSN：1520-5215

文摘

Possible structures of the carbon−nitrogen clusters of the form C_mN_n (m = 1−4, n = 1−4, m + n = 2−5) were predicted for the neutral, anion, and cation species in the singlet, doublet, and triplet states, whenever appropriate. The calculations were performed at the G3, MP2(fc)/6-311+G*, and B3LYP/6-311+G* levels of theory. Several molecular properties related to the experimental data—such as the electronic energy, equilibrium geometry, binding energy, HOMO−LUMO gap (HLG), and spin contamination S²—were calculated. In addition the vertical electron attachment, the adiabatic electron affinity, and vertical ionization energy, of the neutral clusters were calculated. Most of the predicted lowest energy structures were linear, whereas bent structures became more stable with the increase of the cluster size and increase of the number of the N atoms. In most of the predicted lowest energy structures, the N atom prefers the terminal position with acetylenic bond. The calculated BE of the predicted clusters increases with the increase of the cluster size for the neutral and cation clusters but decreases with the increase of the cluster size for the anion clusters. The predicted clusters are characterized by high HLG of about 11 eV on the average, with that of the anion clusters is smaller than that for the neutral and cation clusters. It is concluded then that the anion clusters are less stable than the corresponding neutral and cation clusters. Finally, the N₂ loss reaction is treated.