微量热法研究稀土配合物的热化学性质

Thermochemical Properties of Mixed Complexes of Rare Earth by Microcalorimetry

介绍了一种改进的高精度的恒温环境微量热计,总结了本课题组利用微量热法研究轻稀土三氯醋酸盐、轻稀土三氯醋酸盐与8-羟基喹啉配合物的热力学函数,发现这两类轻稀土配合物的标准摩尔生成焓与稀土元素的原子序数基本呈线性关系,进一步线性拟合计算出轻稀土组内原子序数为596、1的镨元素和钷元素的配合物Pr(TCA)3.3H2O(s)、Pm(TCA)3.3H2O(s)和Pr(TCA)(C9H6NO)2(s)、Pm(TCA)(C9H6NO)2(s)的标准摩尔生成焓分别为:-3 056.639kJ.mol-1,-3 049.953kJ.mol-1和-1 362.259kJ.mol-1,-1 348.936kJ.mol-1.

An improved-precision-isoperibol calorimeter is introduced. Thermochemical properties of light rare earth trichloroacetic acid salts, the mixed complexes of light rare earth trichloroacetic acid salts with 8-hydrox-yquionline by Microcalorimetry have been systematically summarized. In the same group, the standard enthalpies of formation of rare earth complexes are lineared with the atom ordinal numbers on the group, then the standard enthalpies of formation of Pr（TCA）3·3H2O（s）, Pm（TCA）3·3H2O（s） and Pr（TCA）（C9H6NO）2（s）, Pm（TCA） （C9H6NO）2（s） were evaluated in terms of linear fit method as follows： - 3 056.639 kJ·mol^-1, - 3 049.953 kJ·mol^-1 and - 1 362.259 kJ·mol^-1,- 1 348.936kJ·mol^-1.