化学学报 ›› 1998, Vol. 56 ›› Issue (2): 124-128. 上一篇    下一篇

研究论文

C60NH5/6, 6/6异构体的理论研究

尚振锋;潘荫明;王海翔;赵学庄;唐敖庆   

  1. 南开大学化学系;吉林大学理论化学研究所
  • 发布日期:1998-02-15

Theoretical study of C60NH 5/6, 6/6 isomers

SHANG ZHENFENG;PAN YINMING;WANG HAIXIANG;ZHAO XUEZHUANG;TANG AOQING   

  • Published:1998-02-15

用半经验的AM1, PM3及ab initio方法对C60NH两种异构体的结构及光谱进行了理论计算。结果表明, 具有开环结构的C60NH的5/6异构体稳定性要高于具有闭环结构的6/6异构体。计算了两种异构体开环与闭环过程的反应坐标, 发现6/6开环异构体是势能面上的一局部最小点, 而5/6闭环异构体不存在6/6异构体的H可以在两种镜面异构体之间快速翻转, 使其核磁共振谱呈现C2v对称性。通过振动分析确认了所优化的构型确实为势能面的能量最低点, 并得到了C60NH各异构体的红外光谱。

关键词: 红外分光光度法, 核磁共振谱法, 异构体, 从头计算法, 过渡态理论, 富勒烯

Semi-empirical and ab initio studies on the structure and spcetra of C60NH are reported. The Cs(5/6) isomer with annulene structure is more stable than that of Cs(6/6) isomer. The reaction coordinates for the opening and closing of the transannular bond in the 6/6-closed and 5/6-open isomers have been calculated. There is a shallow minimum corresponding to a 6/6-open structure. The H atom of 6/6 isomer can be fast inverted between two mirror isomers so its NMR spectra show C2v symmetry. The vibrational analysis indicates that the optimized geometry is surely the minimum energy point in the potential surface. The IR spectra of C60NH are obtained by calculation.

Key words: INFRARED SPECTROPHOTOMETRY, NMR SPECTROMETRY, ISOMER, AB INITIO CALCULATION, TRANSITION STATE THEORY, FULLERENES

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