摘要
本文报导用分光光度法研究镧系元素铈与间乙酰基偶氮氮膦配合物的吸收光谱、组成,及其β型配合物形成反应的动力学性能,测定其α型配合物的积累稳定常数。进一步研究了其它镧系元素与 CAPmA配合物的热力学稳定性,及其β型反应动力学行为,获得了一定规律性。
The formation constants of the α-form of the lanthanide complexes withCPAmA and the rate constants of the β-form of the relevant complex formationare studied with the spectrophotometric method. The molar composition of the α-form complexes at pH 1.50 are determinedby the Job's, slope ratio and equilibrium shift methods. The results show that theLn/CPAmA ratio is 1:3. The stability consent of the concerning complexesdetermined by the pH-dependent absorbance at certain appropriate wave lengthdecreases with the increasing of atomic number of lanthanides The β-form complexes are formed at Ln/CPAmA of 1.0～2.0 and pH 1.68～2.20 from the corresponding α-form within a certain induced period. Kineticstudies indicate that all reactions belong to the first order. The rate constantincreases from La to Eu and then turns to the descending order from Eu to Lu.
出处
《华东师范大学学报（自然科学版）》
CAS
CSCD
1990年第3期70-75,共6页
Journal of East China Normal University(Natural Science)
基金
国家自然科学基金
关键词
镧系元素
显色
分光光度法
双偶氮
Lanthanide
m-Acetylchlorophosphonazo spectrophotometry
