金属离子水化能的计算

本文利用单参数z~*/ri总结金属离子水化能的数据。得出经验公式Li=b+az~*/ri,z~*为有效核电荷,ri为离子半径。a,b是经验常数,对一、二、三、四价金属离子分别为,50和20,98和182,113.5和460,85和1155。本文计算了55个金属离子,同实验值比较,百分误差在2％以内的有47个。此法简便,结果也比文献4]、5]好。

Calculation of the Hydration Energies of Cations

It has been found that it is possible to correlate the hydration energies of cations with their charge-to-size ratio, by the expression Li=az~*/ri+b Equation relating these parameters with the effective nuclear charge z~* and ion radii of metals were derived. Li can be calculated in terms of these para meters. These constants a, b are 50, 20; 78, 182; 113.5, 460 and 85, 1155 in mono-, hi-, tri-and tetravalent cations respectively. The results of calculation are closed to experimental values.