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

Abstract

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 △H_n→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

TrendMD:

Yin Jingzhi, Jiang Bengao, Sun Tongsan, Zhang Jianhua, Pan Jingzhi, Tang Xiaoming. Preparation, Properties and Determination of Standard Molar Enthalpies of Formation for Rare Earth Isothiocyanates Lower Hydrates[J]. Chem. J. Chinese Universities, 1989, 10(4): 329.

References

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