摘要
本文用自制的装有 BaF_2探头的高探测效率的正电子湮没寿命谱仪测量了在室温下正电子素 o-Ps 与 p-RPhG 及 m-RPhG(R=NO_2,Cl,H,CH_3,cH_3O)在20%(V/V)二氧六环水溶液中的络合形成速度常数。实验结果表明,这些o-Ps-M 络合形成速度常数 K 值均与作为配位体的 p-RPhG、m-RPhG 的碱性解离常数 K 的负对数 pK_2 呈线性函数。这表明上述瞬态络合反应满足线性自由能关系,由此可推断出上述络合反应的一些重要性质。
In this paper the transient complex formation rate constants of o-Ps with p-RPhG and m-RPhG(R=NO_2,Cl,H,CH_3,CH_3O)in 20%(v/v)dioxane-water solution at room temperature are measured by a high efficicnt positron annihilation lifetime spectrometer with BaF_2 detectors.The results of the experiment show that these rote constants kcan be expressed as a linear function of the negative logarithm of the basic dissociation con- stants of ligands p-RPhG and m-RPhG,Pk_2.The means that a linear free-energy relationship exists and that some important propertics of the transient complex formation can be deduced.
出处
《中国民航学院学报》
1992年第3期42-45,共4页
Journal of Civil Aviation University of China
关键词
瞬态络合形成
速度
常数配位体
the transient complex formation rate constants of o-Ps-M
p-RPhG and m-RPhG as ligands
the linear free-energy relationship
