高等学校化学学报

高等学校化学学报 ›› 2003, Vol. 24 ›› Issue (5): 868.

• 论文 • 上一篇    下一篇

C59H3N异构体的结构与稳定性的理论研究

梁云霄1,2, 尚贞锋1, 王贵昌1, 潘荫明1, 赵学庄1   

  1. 1. 南开大学化学系, 天津 300071;
    2. 齐齐哈尔大学化学与化工学院, 齐齐哈尔 161006
  • 收稿日期:2002-06-12 出版日期:2003-05-24 发布日期:2003-05-24
  • 通讯作者: 赵学庄(1933年出生),男.教授,博士生导师,从事理论化学研究.E-mail:zhaoxzh@nankai.edu.cn E-mail:zhaoxzh@nankai.edu.cn
  • 基金资助:

    国家自然科学基金(批准号:20073022)

Studies on the Structures and Stabilities of C59H3N Isomers

LIANG Yun-Xiao1,2, SHANG Zhen-Feng1, WANG Gui-Chang1, PAN Yin-Ming1, ZHAO Xue-Zhuang1   

  1. 1. Department of Chemistry, Nankai University, Tianjin 300071, China;
    2. College of Chemistry and Chemical Engineering, Qiqihaer University, Qiqihaer 161006, Chnia
  • Received:2002-06-12 Online:2003-05-24 Published:2003-05-24

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摘要： 分别用MNDO,AM1和PM3三种半经验方法对C59HN所有1-2,1-4和1-6氢加成物C59H3N的异构体进行几何构型全优化,结合频率分析及HF/6-31G单点能计算,确定了各异构体的基态结构及其相对稳定性,计算结果表明,C59HN氢加成物的立体选择性规律与C60和C60H2的不同,最稳定异构体不是1-2加成物,而是1-4加成的6,18-或12,15-异构体,次稳定异构体为1-2加成物,三种半经验方法计算得到的两者能量差为13～15kJ/mol,N原子取代碳笼骨架C原子后,改变了碳笼氢加成物的立体选择性规律.

关键词: C59H3N, 半经验方法, 相对稳定性, 异构体结构

Abstract: The structures and stabilities of all 1-2, 1-4 and 1-6 hydrogen adducts of C59HN were studied by using semiempirical MNDO, AMIand PM3 methods. In order to verify the reliability of the semiem-pirical methods, some energetically favored isomers of these hydrogen adducts were calculated by using HF/6-31G for single-point energy. The calculation results indicate that in general, 1-2 adducts are more stable than 1-4 adducts and far more stable than 1-6 adducts. However, the most stable isomer is 6,18- or 12,15- isomer which is a 1-4 adduct and the second most stable isomer is a 1-2 adduct, calculated by the three semiempirical methods the energy of the former is lower than that of the latter by 13-15 kJ/mol. The computed nucleus independent chemical shifts(NICS) indicate that the more stable the isomer, the more aromatic the molecule, aromaticity may be the primary factor governing the stabilities of C59H3N isomers. By replacing one Catom of the fullerene skeleton with an Natom, the regioselectivity of the carbon cage has been changed. According to the result of frequency analysis, we have predicted the IRspectrum of the most stable isomer.

Key words: C59H3N, Semi-empirical methods, Relative stabilities, Structures of isomers

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