超灵敏跃迁法测定稀土钕(Ⅲ)—维生素C配合物的稳定常数  

DETERMINATION OF STABILITY CONSTANTS OF NEODYMIUM(Ⅲ) L-ASCORBIC COMPLEX BY HYPERSENSITIVE TRANSITION METHOD

作　　者：张强[1] 刘利平[2] 吴红英[1] 

机构地区：[1]内蒙古师范大学化学系,呼和浩特010022 [2]内蒙古医学院化学教研室,呼和浩特010059

出　　处：《内蒙古医学院学报》2000年第3期178-181,共4页Acta Academiae Medicinae Neimongol

基　　金：内蒙古自然科学基金资助项目

摘　　要：目的 :测定稀土钕 (Ⅲ )与L -抗坏血酸 (VC)配合物的稳定常数。方法 :利用稀土f-f超灵敏跃迁吸收的振子强度与配体浓度的关系 ,获得自由配体浓度和相应生成函数的系列数值 ,从而由自编计算机程序拟合出配合物的稳定常数。结果 :随着配体浓度增大 ,Nd3 +离子超灵敏跃迁吸收显著增大 ,其振子强度Pexp与配体实际总浓度CxA 有较好的线性关系。经过拟合处理得到比较满意的稳定常数值 ,进一步证实了用测量振子强度来测定稳定常数是可行的。结论 :本方法在稀土单核配合物稳定常数的测定上能获得可靠的结果。Objective:To determine the stability constants of Nd(Ⅲ) L ascorbic complex. Methods: The stability constants of the Nd(Ⅲ) L ascorbic complex were determined by the spectra of hypersensitive transition from the oscillator strength as a function of total ligand concentration. The stability constants were calculated using a fitting method of an appropriate computer program. Results: Typical variations of the “hypersensitive” band accompanying changing of total ligand concentrations are illustrated in the absorption spectrum. The data confirm the suitability of oscillator strength measurements for the determination of stability constants. Conclusion: This experiments is the best confirmation of the applicability of the spectroscopic method for the determination of stability constants. The result is reliable and good.

关 键 词：维生素C 稳定常数 超灵敏跃迁 

分 类 号：R977.23[医药卫生—药品]