高等学校化学学报

高等学校化学学报 ›› 1989, Vol. 10 ›› Issue (4): 329.

• 研究论文 •    下一篇

稀土元素异硫氰酸盐低水合物的制备、性质及标准生成焓的测定

尹敬执1, 蒋本杲1, 孙同山1, 张建华1, 潘景之2, 唐晓明2   

  1. 1. 山东大学化学系;
    2. 山东化学研究所
  • 收稿日期:1987-07-11 出版日期:1989-04-24 发布日期:1989-04-24
  • 通讯作者: 蒋本杲
  • 基金资助:

    中国科学院科学基金

Preparation, Properties and Determination of Standard Molar Enthalpies of Formation for Rare Earth Isothiocyanates Lower Hydrates

Yin Jingzhi1, Jiang Bengao1, Sun Tongsan1, Zhang Jianhua1, Pan Jingzhi2, Tang Xiaoming2   

  1. 1. Department of Chemistry, Shandong University, Jinan;
    2. Shandong Institute of Chemistry, Jinan
  • Received:1987-07-11 Online:1989-04-24 Published:1989-04-24

PDF (PC)

被引次数

2

摘要： 制备了11种低水合物RE(NCS)3·mH2O(RE=La,Ce,Pr,Nd时,m=4.5;RE=Sm,Eu,Gd,Dy,HO,Yb,Y时,m=3)。测得了它们的熔点,并对其X射线物相分析进行了研究。采用量热法,测定了除Y以外的10种低水合物的标准生成焓,求得了它们的晶格能,以及从高水合物至相应的低水合物的标准脱水焓。还对Tb,Er,Tm,Lu4种RE(NCS)3·mH2O(m=3)的相应数据进行了估算。

关键词: 稀土, 异硫氰酸盐, 低水合物, 标准生成焓

Abstract: The lower hydrates RE(NCS)3·mH2O(when RE=La, Ce, Pr, Nd, m=4.5; when RE=Sm, Eu, Gd, Dy, Ho, Yb, Y, m=3) were prepared by means of dehydration of corresponding higher hydrates RE(NCS)3·nH2O (when RE=La, Ce, Pr, Nd, n=7;when RE=Sm, Eu ..Gd, Dy, Ho, Yb, Y, n=6). The melting points of RE(NCS)3·mH2O and RE(NCS)3·nH2O were determined by means of capillary tubes.Both integral heats of solution of RE(NCS)3·mH2O and RE(NCS)3·nH2O (except Y) in water were measured calorimetically at 298.15K. The standard enthalpies of formation of ten lower hydrates RE(NCS)3·mH2O were obtained. The standard dehydration enthalpies △Hn→m°of higher hydrates RE(NCS)3·nH2O to corresponding lower hydrates RE(NCS)3·mH2O and lattice energies of RE(NCS)3·mH2O were also calculated. The corresponding data of RE(NCS)3· mH2O (RE=Tb, Er, Tm, Lu) were estimated.

Key words: Rare earth, Isothiocyanate, Lower hydrate, Standard enthalpies of formation

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