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  • 1 Northwest University, Xian Department of Chemistry 710069 Shaanxi P. R. China 710069 Shaanxi P. R. China
  • | 2 Xian Modern Chemistry Research Institute, Xian 710065 Shaanxi P. R. China 710065 Shaanxi P. R. China
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Abstract  

The enthalpies of solution in water of RE(His)(NO3)3H2O (RE=La—Nd, Sm—Lu, Y) were measured calorimetrically at 298.15 K, and the standard enthalpies of formation of RE(His)aq3+ (RE=La—Nd, Sm—Lu, Y) were calculated. The plot of the enthalpies of solution vs. the atomic numbers of the elements in the lanthanide series exhibits the tetrad effect.