钯(Ⅱ)-2,2'-联吡啶-3,3'-二羧酸-氨基酸三元体系配位平衡  

Coordination Equilibrium of Pd(Ⅱ)—2,2'-Bipyridyl-3,3'-Dicarboxylic Acid—Aminoacid Ternary Complexes

作　　者：刘瑕[1] 兰丽艳[1] 高恩君[1] 

机构地区：[1]沈阳化工学院配位化学研究室,辽宁沈阳110142

出　　处：《沈阳化工学院学报》2004年第3期161-164,共4页Journal of Shenyang Institute of Chemical Technolgy

基　　金：沈阳化工学院青年科研起动基金资助项目(200303)

摘　　要：　用pH 电位滴定法测定三元配合物Pd(BDA)(Aa)体系在水溶液中离子强度为0.1mol/L(KNO3)、温度为25℃时的稳定常数对数lgβ、表征常数ΔlgK、lgX值,同时测出各配体与Pd(Ⅱ)离子形成二元配合物的稳定常数值.这里BDA为2,2' 联吡啶 3,3' 二羧酸,Aa则为丙氨酸根(Ala-)、天门冬氨酸根(Asp2-)、天门冬酰胺根(Asn-)、谷氨酰胺根(Gln-)和苯丙氨酸(Phe-).所有三元配合物稳定常数及表征常数的实测值均大于相应的统计期望值,从配体间d～pπ电子效应、电性中和及芳环堆砌等弱相互作用角度对配合物的额外稳定性进行了讨论.The stability constants of Pd(BDA)(Aa) ternary complexes have been determined by Potentionmetric pH titration at 25 ℃ with the ionic strength 0.1 mol/L(KNO_3), where BDA=2,2'-bipyridyl-3,3'-dicarboxylic acid, Aa=Alanine,Phenylalanine, Asparatic acid, Asparagine and Glutamine. The relative stability constants of ternary complexes Δlg K, lg X have also been calculated. All the stability constants and the practical values of relative stability constants are bigger than that of expectation. The degree of stability has been discussed from the view of d～pπ electronic effect, electrical counteract and aromatic nucleus stacking.

关 键 词：钯(Ⅱ) 三元配合物 稳定性 氨基酸 电子效应 电性中和 芳环堆砌 

分 类 号：O614.82[理学—无机化学]