化学学报 ›› 2004, Vol. 62 ›› Issue (8): 769-774. 上一篇    下一篇

研究论文

HPO3异构体结构与稳定性

于海涛1, 仲华1, 池玉娟1,2, 付宏刚1,2,3, 孙家钟1,3   

  1. 1. 黑龙江大学化学化工学院, 哈尔滨, 150080;
    2. 哈尔滨工业大学应用化学系, 哈尔滨, 150001;
    3. 吉林大学理论化学研究所, 理论化学计算国家重点实验室, 长春, 130023
  • 投稿日期:2003-08-16 修回日期:2003-12-20 发布日期:2014-02-18
  • 通讯作者: 付宏刚,E-mail:fuhg@vip.sina.com E-mail:fuhg@vip.sina.com
  • 基金资助:
    国家自然科学基金(Nos.20301006,20271019)及黑龙江省杰出青年科学基金(2003)资助项目.

Structures and Stability of HPO3 Isomers

YU Hai-Tao1, ZHONG Huaa1, CHI Yu-Juan1,2, FU Hong-Gang1,2,3, SUN Jia-Zhong1,3   

  1. 1. College of Chemistry and Chemical Engineering, Heilongjiang University, Harbin 150080;
    2. Department of Applied Chemistry, Harbin Institute of Technology, Harbin 150001;
    3. State Key Laboratory of Theoretical and Computational Chemistry, Institute of Theoretical Chemistry, Jilin University, Changchun 130023
  • Received:2003-08-16 Revised:2003-12-20 Published:2014-02-18

使用密度泛函方法(B3LYP)和6-311++G(3df, 3pd)基组计算得到了HPO3体系的9个异构体与11个过渡态,并用内禀反应坐标理论验证了异构体的异构化过程.结果表明,在HPO3体系中,只有热力学最稳定的平面型异构体HOPO2(E1), (cis, cis)构象的HOOPO (E3)和立体的具有Cs对称性的异构体HP(O)O2(E7)具有较高的动力学稳定性,理论预测结果与实验一致.另外2个立体的HOPO2连接方式的异构体(E2和E4)由于解离为HO(Π)+OPO(2A1)的解离能较低,因此不能稳定存在.

关键词: HPO3体系, 异构体, 异构化作用, 动力学稳定性

The potential energy surface (PES) of HPO3 system including nine isomers and eleven transition states was predicted at B3LYP/6-311++G(3df, 3pd) level of theory, and the connections were checked by intrinsic reaction coordinate calculations. The calculated results indicated that in HPO3 system thermodynamically the most stable species HOPO2 with planar structure (E1), (cis, cis)-HOOPO conformational isomer (E3), and stereo HP(O)O2 with Cs symmetry, were found to have higher kinetic stability. The predicted results are in good agreement with previous experimental studies. Two new stereoisomers with HOPO2 connectivity obtained in this work were unstable because of their very low dissociation energies.

Key words: HPO3 system, isomer, isomerization, kinetic stability