Chem. J. Chinese Universities ›› 2009, Vol. 30 ›› Issue (6): 1219.

• Articles • Previous Articles     Next Articles

Theoretical Studies on Molecular Behavior of C50(D5h) Derivative: Heterofullerene C48P2

XU Xiu-Fang*, SHANG Zhen-Feng, LI Rui-Fang, ZHAO Xue-Zhuang   

  1. Department of Chemistry, Nankai University, Tianjin 300071, China
  • Received:2008-04-01 Online:2009-06-10 Published:2009-06-10
  • Contact: XU Xiu-Fang, E-mail: xxfang@nankai.edu.cn
  • Supported by:

    国家“九七三”计划(批准号: 2006CB932900)资助.

Abstract:

A systematic investigation on all possible P-doped C50(D5h) isomers C48P2 was performed using the semiempirical methods AM1 and MNDO and density functional theory method B3LYP/3-21G. The equilibrium geometrical structures, heats of formation, HOMO-LUMO energy gaps, aromaticity, infrared vibrational spectrum and electronic absorption spectrum were studied. Further, the molecular behavior was compared with those of C48X2(X=B, N). The results indicate that: (1) the isomer C48P2-78, which corresponds to 1,4-substitution in the six-membered ring located on the equator, is the most stable isomer for C48P2. (2) The driving force governing the stabilities of the present studied C48P2 isomers is the strain being inherent in the C50 cage, while the stability doesn′t correlate with the aromaticity. (3) The more stable C48P2 isomers have larger HOMO-LUMO energy gap compared with C50. (4) The vibrational spectra and electronic absorption spectra of these substituted fullerenes have been calculated, which could serve as a framework to interpret future experimental results. The computed nucleus independent chemical shifts(NICS) values also provide a basis for the possible characterization of these C48P2 isomers. (5) C48P2 and C48X2(X=B, N) have the same rule of doping and governing force of stability, and larger HOMO-LUMO energy gap compared with C50.

Key words: Heterofullerene, Geometrical structure, Stability, Spectrum

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