化学学报 ›› 2002, Vol. 60 ›› Issue (4): 660-663. 上一篇    下一篇

研究论文

2-氟-5-溴吡啶分子振动光谱的密度泛涵理论研究

郭勇;谢代前;薛英;鄢国森   

  1. 四川大学化学系,成都(610064)
  • 发布日期:2002-04-15

Density Functional Theory Studies on Vibrational Spectra of 2- Fluoro-5-bromopyridine

Guo Yong;Xie Daiqian;Xue Ying;Yan Guosen   

  1. Department of Chemistry, Sichuan University,Chengdu(610064)
  • Published:2002-04-15

用密度泛函理论方法B3LYP以及6-311++G(2df,2pd)基组对2-氟-5-溴吡啶分子 的平衡几何构型进行了优化并计算了该分子的振动谐力场。使用Pulay的标度方法 对理论力场进行了标度。采用Wilson的GF矩阵方法,根据标度后的理论力场进行了 简正坐标分析,对2-氟-5-溴吡啶分子的振动基频进行了理论研究,得到了势能分 布和红外振动频率。与红外频率的实验值相比较,理论频率的均方差为24 cm~(-1) 。此外,根据振动模式的势能分布对此分子的振动基频进行了理论归属,并对前人 的指认进行了修正和补充。

关键词: 吡啶 P, 溴化合物, 氟化合物, 简正坐标分析, 几何构型

The optimized geometries, vibrational force fields and infrared intensities of 2-fluoro-5-bromopyridine molecule were calculated by using density functional theory B3LYP method with 6-311++G(2df,2pd) basis set. The theoretical force field was scaled using the scaled quantum mechanical force field. The root-mean-squares deviation was found to be 24 cm~(-1) for calculated frequencies. The assignment of the vibrational fundamentals for 2-fluoro-5-bromopyridine molecule was also performed according to the potential energy distributions.

Key words: PYRIDINE P, BROMINE COMPOUNDS, FLUORINE COMPOUNDS, NORMAL COORDINATE ANALYSIS, CONFIGURATION

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