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Citation: LI Zhi-Wei, ZHAO Cun-Yuan, CHEN Liu-Ping. Structures and Aromaticities of As^-₅, [As₅M]^-, and [As₅MAs₅]^2-(M=Ti, Zr, Hf)[J]. Acta Physico-Chimica Sinica, ;2008, 24(05): 755-759. doi: 10.3866/PKU.WHXB20080504 shu

Structures and Aromaticities of As^-₅, [As₅M]^-, and [As₅MAs₅]^2-(M=Ti, Zr, Hf)

1.
College of Chemistry and Chemical Engineering, Zhaoqing University, Zhaoqing 526061, Guangdong Province, P. R. China; School of Chemistry and Chemical Engineering, Sun Yat-Sen University, Guangzhou 510275, P. R. China

Received Date: 24 December 2007
Available Online: 17 March 2008

The structures, energies, harmonic vibrational frequencies, and nucleus independent chemical shifts (NICS) of As-5 , [As5M]- and [As5MAs5]2-(M=Ti, Zr, Hf) were calculated by the density functional theory (DFT) . The dissected NICS of these species were computed to discuss the NICS contributions of the σ bonds, π bonds, lone pairs, and core electrons of As and M atoms. The calculations showed that the ground states of As-5, [As5M]-, and [As5MAs5]2- were in D5h, C5v, and D5h symmetries, respectively, and they were aromatic with negative NICS values. The dissected NICS indicated that the aromaticity of As-5 (D5h) mainly arised fromthe contributions of As—As π and As—As σ bonds, and the total NICS of [As5M]-(C5v) were dominated by the contributions of As—M bonds with the As—As σ bond followed. The total NICS of [As5TiAs5]2-(D5h) arised mainly from the As—As π bonds, and in the [As5ZrAs5]2-(D5h), the contribution of the As—As π bonds reduced while the contribution of the As—Zr bond increased relatively. In the [As5HfAs5]2- (D5h), the aromaticity mainly owed to the effects of the As—Hf bonds.
- Nucleus independent chemical shifts; Aromaticity; Sandwich complex
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沈阳化工大学材料科学与工程学院沈阳 110142

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Structures and Aromaticities of As-5, [As5M]-, and [As5MAs5]2- (M=Ti, Zr, Hf)

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通讯作者: 陈斌, bchen63@163.com

Structures and Aromaticities of As^-₅, [As₅M]^-, and [As₅MAs₅]^2-(M=Ti, Zr, Hf)