摘要
本文选择N-(对位取代苯基)亚氨基二乙酸(p-RC_6H_4N(CH_2COOH)_2,R=CH_3O,CH_3,H,Cl,简写为PRPh_1DA,以NR(OH)_2或H_2L表示)为配体,采用断流分光光度计研究了Ni(Ⅱ)与此配体生成配合物的反应动力学。结果发现,两性离子具有较高的反应活性,且反应活性随配体碱性增大而降低,其反应机理与二齿配体的反应很相似。 实验方法见[1]。其中配体N-(对位取代苯基)亚氨基二乙酸的合成见[2],用KNO_3控制离子强度0.1mol·dm^(-3),动力学研究最佳波长250nm,反应温度25.0±0.31℃。
The kinetics of the complexation reaction of N-(p- substituted phcnyl) imino-diacetic acid with nickel(II) was determined by stopped-flow method at 25± 0.1℃ and 0.1mol·dm-3 KNO3. The experimental results showed that not only the ligand anion but also the zwittcrion is an attacking species in the complexation reaction. The reaction takes place by way of two competing paths. It was found that linear free energy relationships exist not only between the reactivity of the zwittcrion and base strength of the ligands, but also exist between the dissociation rate constants and the base strength of ligands and the stability constants of the binary complexes.
出处
《无机化学学报》
SCIE
CAS
CSCD
北大核心
1992年第3期339-342,共4页
Chinese Journal of Inorganic Chemistry
关键词
镍
络合物
反应动力学
N-(p-substituted phenyl) imino-diacetic acid nickel(II) stopped-flow spectrophotometer linear free energy relationship
