高等学校化学学报 ›› 2015, Vol. 36 ›› Issue (3): 531.doi: 10.7503/cjcu20140873

• 物理化学 • 上一篇    下一篇

FOX-12制备过程的反应机理及动力学

王宽1,2, 陈建刚1,2(), 王伯周3, 吕剑3, 王文亮2, 刘峰毅2, 周诚3, 廉鹏3, 刘忠文1,2, 刘昭铁1,2   

  1. 1. 陕西师范大学应用表面与胶体化学教育部重点实验室
    2. 化学化工学院, 西安 710119
    3. 西安近代化学研究所, 西安 710065
  • 收稿日期:2014-09-26 出版日期:2015-03-10 发布日期:2015-01-30
  • 作者简介:联系人简介: 陈建刚, 男, 博士, 助理研究员, 主要从事反应动力学与机理以及超临界流体研究. E-mail: jgchen@snnu.edu.cn
  • 基金资助:
    国家自然科学基金(批准号: 21306111, 21327011)、 陕西省自然科学基金(批准号: 2014JM2034)和中央高校基本科研业务费(批准号: GK201402050, GK201401001)资助

Mechanisms and Kinetics of the Synthesis of FOX-12

WANG Kuan1,2, CHEN Jiangang1,2,*(), WANG Bozhou3, LU Jian3, WANG Wenliang2, LIU Fengyi2, ZHOU Cheng3, LIAN Peng3, LIU Zhongwen1,2, LIU Zhaotie1,2   

  1. 1. Key Laboratory of Applied Surface and Colloid Chemistry, Ministry of Education
    2. School of Chemistry & Chemical Engineering, Shaanxi Normal University, Xi’an 710119, China
    3. Xi’an Modern Chemistry Research Institute, Xi’an 710065, China
  • Received:2014-09-26 Online:2015-03-10 Published:2015-01-30
  • Contact: CHEN Jiangang E-mail:jgchen@snnu.edu.cn
  • Supported by:
    † Supported by the National Natural Science Foundation of China(Nos.21306111, 21327011), the Natural Science Foundation of Shaanxi Province, China(No.2014JM2034), and the Fundamental Research Funds for the Central Universities, China(Nos.GK201402050, GK201401001)

摘要:

采用量子化学计算方法, 在B3LYP/6-311G(d,p)水平上研究了N-脒基脲二硝基酰胺盐(FOX-12)制备过程的反应机理. 优化得到了反应势能面上各稳定点的几何构型, 通过内禀反应坐标(IRC)确认了反应物、 中间体、 过渡态及产物之间的相关性. 为了得到更可靠的反应能量和势能面信息, 进一步在MP2/6-311++G(3df,3pd)水平上对得到的构型进行能量校正, 结果表明, 先取代磺酸基通道(A1)和先取代氢通道(B)都能生成二硝基酰胺酸(HDN), 其中通道A为主反应通道; HDN可以通过HDN→FOX-12与HDN→ADN→FOX-12 两种途径转化为目标产物FOX-12, 而第2种途径为较优途径. 应用经典过渡态理论(TST)与变分过渡态理论(CVT)以及小曲率隧道效应模型校正的变分过渡态理论(CVT/SCT)计算了在200~400 K范围内各反应通道相关基元反应的速率常数, 提供了在上述温度区间内的三参数Arrhenius关系式.

关键词: N-脒基脲二硝基酰胺盐(FOX-12), 反应机理, 速率常数, 量子化学计算

Abstract:

The mechanisms of the synthesis of N-guanylurea-dinitramide(FOX-12) were investigated at B3LYP/6-311G(d,p) level. The geometries of the reactants, intermediates, transition states, and products were optimized, respectively. The relevance between every transition state and the corresponding reactant/product was confirmed via the intrinsic reaction coordinates(IRC). The single-point energies of the species at the optimized geometries were corrected at the MP2/6-311++G(3df,3pd) level. It was shown that the binitro-amide acid(HDN) could be obtained by both channel A1, in which —SO3 was preferentially replaced by nitronium(NO2+), and channel B, in which —H was preferentially replaced by NO2+, while the channel A1 was found to be the dominant channel. Then the intermediate product of HDN could be converted to the targeted product of FOX-12 via the channel of either HDN→FOX-12 or HDN→amonium dinitramide(ADN)→FOX-12, while the latter was tend to be considered as the better approach. The rate constants were calculated at temperature ranges of 200—400 K by means of the classical transition state theory(TST) and the canonical vibration transition state theory(CVT) corrected by the small-curvature tunneling(SCT). And the three-parameter Arrhenius expressions of rate constants were also provided. It was expected that the present study may provide a theoretical basis to the research and engineering amplification of FOX-12 as well as other energetic materials.

Key words: N-Guanylurea-dinitramide(FOX-12), Mechanism, Rate constant, Quantum chemistry calculation

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