中华医学超声杂志

应用化学 ›› 1991, Vol. 0 ›› Issue (6): 53-56.

• 研究论文 • 上一篇    下一篇

[n-CnH2n+1NH3]2ZnCl4配合物相变研究

郭宁, 刘振海, 曾广赋, 席时权   

  1. 中国科学院长春应用化学研究所, 长春 130022
  • 收稿日期:1990-07-25 修回日期:1990-12-27 出版日期:1991-12-10 发布日期:1991-12-10

PHASE TRANSTION OF(n-CnH2n+1 NH3)2 ZnCl4

Guo Ning, Liu Zenhai, Zeng Guangfu, Xi Shiquan   

  1. Changchun Institute of Applied Chemistry, Academia Sinica, Changchun 130022
  • Received:1990-07-25 Revised:1990-12-27 Published:1991-12-10 Online:1991-12-10

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摘要： 采用差示扫描量热法(DSC)和热重法(TG),研究了〔n-CnH2n+1NH3〕2ZnCl4(n=9～12)配合物的热稳定性和固-固相变。该系列配合物的分解反应活化能和热稳定性基本上不随烷基链长而变化。配合物在280～370K存在固-固相变。相变数目表现出奇偶效应。相变热焓ΔH和熵ΔS随着烷基链长的增加而线性增大。主转变的峰值温度随烷基链的增长而升高,相应的相变被归属为烷基铵链的结构相变。

关键词: 相变, 四氯含锌酸二烷基铵, 构象

Abstract: The thermal stability and the phase transition in the (n-CnH2n+1NH2)3ZnCl4 (n = 9～12)have been studied by DSC and TG techniques. The thermal stability and the activation ene-rgies for the first decomposition step are inderendent of the hydrocarbon chain lenth. Allcompounds showed a solid-solid transition at 288～370K. The number of the phase transitionpeaks presents an odd-even effect. The total transition erithalpies and entropies increase withthe number of carbon atom in chains. The peak temperature of the main transition riseswith the increase of the chain length. The main phase transition has been assigned to thestructural transition of chains.

Key words: phase transition, bis(n-alkylammonium)tetrachlornzincate, melecular conformation

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