配合物的稳定性与配体酸碱强度之间的直线自由能关系——Ⅻ 铜(Ⅱ)—杂环芳香碱—N-取代乙二胺三元体系  

LINEAR FREE ENERGY RELATIONSHIPS BETWEEN STABILITY OF COMPLEXES AND BASE STRENGTH OF LIGANDS XII COPPER(II)-5-SUBSTITUTED PHENANTHROLINE-N- SUBSTITUTED ETHYLENEDIAMINE TERNARY SYSTEMS

作　　者：陈荣悌[1] 林华宽[1] 朱俊英[1] 

机构地区：[1]南开大学化学系,天津300071

出　　处：《无机化学学报》1992年第2期190-193,共4页Chinese Journal of Inorganic Chemistry

摘　　要：为了研究三元配合物体系中的直线自由能关系,特别是配体的空间位阻的影响,本文用pH法测定了铜(Ⅱ)—杂环芳香碱与第二配体N-取代乙二胺形成三元配合物的稳定常数及第二配体的质子化常数,报道了三元配合物的稳定性与第一配体杂环芳香碱的酸碱强度之间和第二配体取代基空间位阻E_s之间存在线性关系。The stability constants of the ternary copper(n ) complexes of the type CuAB(where A is 5-substituted 1, 10-phenanthroline Xphen X = NO2, Cl, H, CH3 and B is N-substituted ethylenediamine REn R = H, Et, n-pr, n-Bu, i-pr, cyclohex, Ph) have been determined by potentiometric titration in aqueous solution at 25℃ and I=0.1mol·dm-3 KNO3. Some linear free energy relationships have been found to exist between the stability of the ternary complexes and the base strength of the ligands. The Taft type linear free energy relationships are also found to exist in these systems.

关 键 词：自由能 空间位阻 三元配合物 铜 

分 类 号：O614.121[理学—无机化学]