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系统地研究了稀土与多卤代变色酸双偶氮(PHA)体系取代反应的动力学行为,讨论了反应速率常数与原子序数的关系,提出了用来评价速差分析可行性标志——速差值Rd(Rate differentiation)=lgk_(z+n)-lgk_z的新概念。对于镧系元素,相邻离子间的Rd值随原子序数的增加先增大而后减小,故中、重稀土部分是较理想的速差体系(如Sm-Gd,Gd-Y)。在计算机上用实验数据进行理论拟合,获得满意的结果和图谱,进一步证明了这些规律。
The kinetic behaviors of rare earth and polyhalo chromotropic acid disazo (PHA) systems were systematically investigated. The relationship between the reaction rate constants and the atomic numbers was discussed. A new method was proposed to evaluate the feasibility of velocity difference analysis - Difference Rd (Rate differentiation) = lgk_ (z + n) -lgk_z new concept. For the lanthanides, the Rd values of adjacent ions first increase and then decrease with the increase of atomic number, so the medium and heavy rare earth parts are the ideal velocity difference systems (such as Sm-Gd, Gd-Y). In the computer with experimental data for theoretical fitting, to obtain satisfactory results and maps, to further prove these rules.