链酚胺型配体合成及其与锌(Ⅱ)离子配位研究

SYNTHESES OF POLYAMINODIPHENOL LIGANDS AND STUDIES ON THEIR COMPLEXATION WITH Zn(Ⅱ)

金属酶的模拟研究越来越受到重视，其中锌酶具有数量多、作用范围广等特点［１，２］。在不同功能的金属酶中，活性中心金属离子的几何构型可以发生较大的变化［３］。锌（Ⅱ）离子的ｄ１０电子构型使其配合物不具有晶体场稳定化作用，使其具有更大自由度的配位数选择性以...

Three polyaminodiphenol ligands (R NH(CH 2) l (NH)m(CH 2)nNH R,R=2 hydroxybenzyl,H 2L a, l=2,m=n =0;H 2L b, l=3,m=n =0;H 2L c, l=n=2,m =1) have been synthesized and characterized by elemental analyses,IR and 1H NMR.By potentionmetric pH titration at 25±0.1℃,I=0.1mol/L(KNO 3),protonation constants of the ligands and equilibrium constants of Zn(Ⅱ) complexation with them have been determined.Meanwhile,the forms of ligands coordinated to Zn(Ⅱ) are discussed.Dissociation constants of phenols in the complexes were obtained.The pKa values are 5.84,6.82,and 6.15 for complexes ZnLa,ZnLb and ZnLc,respectively.The experimental results indicate that complex of Zinc ion with L 2- a contains a water molecule with a pKa value 7.77.