高等学校化学学报 ›› 1995, Vol. 16 ›› Issue (9): 1344.

• 论文 • 上一篇    下一篇

La(NCS)3·4.5H2O和B15C5在乙醇中的相平衡及热化学研究

薛岗林1, 党高潮1, 李谦定1, 任德厚1, 张泉珍2, 宋迪生2   

  1. 1. 西北大学化学系, 西安, 710069;
    2. 西北大学热化学研究室
  • 收稿日期:1994-12-07 修回日期:1995-04-25 出版日期:1995-09-24 发布日期:1995-09-24
  • 通讯作者: 薛岗林,男,38岁,讲师.
  • 作者简介:薛岗林,男,38岁,讲师.

Studies on Phase Equilibrium and Thermochemistry of La(NCS)3·4.5H2O with Bl5C5 in C2H5OH

XUE Gang-Lin1, DANG Gao-Chao1, LI Qian-Ding1, REN De-Hou1, ZHANG Quan-Zhen2, SONG Di-Sheng2   

  1. 1. Department of Chemistry, Northwest University Xi'an, 710069;
    2. Research Laboratory of Thermochemistry Northwest University Xi'an, 710069
  • Received:1994-12-07 Revised:1995-04-25 Online:1995-09-24 Published:1995-09-24

摘要: 采用半微量相平衡方法测定了三元体系La(NCS)3·4.5H2O-B15C5-C2H5OH在298.15K的溶解度,测定了各饱和溶液的折光率。结果表明:该体系中生成了一种化学计量的配合物La(NCS)3·Bl5C5·4.5H2O(I).制备了固态配合物,用IR、TG、DTG、DSC及电导对其进行了表征。采用量热法测定了298.15K时B15C5和(I)在C2H5OH中的积分溶解热以及La(NCS)3·4.5H2O在B15C5-C2H5OH溶液中的热效应,依据本文所设计的热化学反应,求得了配合物(I)的标准生成焓。

关键词: 相平衡, 配合物, 冠醚Bl5C5, 异硫氰酸镧, 标准生成焓

Abstract: The solubilities of the ternary system, La(NCS)3·4.5H2O-B15C5-C2H5OH, were investigated at 298.15 K by a semimicro method for study of phase equilibrium and the refractive indexes of saturated solutions were determined.Astoichiometrical coordination compound, La(NCS)3·B15C5·4.5H2O(I), formed in the system.The solid coordination compound was prepared and characterized by IR, TG, DTG, DSCand conductivity measurement.The integral heats of solution of La(NCS)3·4. 5H2O in B15C5-C2H5OH solution,the complex(I) and B15C5 in C2H5OH were measured calorimetrically at 298.15 K. By means of thermochemical reactions suggested in this paper, the standard molar enthalpy of formation for(I) was obtained.

Key words: Phase equilibrium, Complex, Crown ether Bl5C5, Lanthanum isothiocyanate, Standard molar enthalpy of formation

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