The effect on the lanthanide luminescence of structurally simple Eu(iii) cyclen complexes upon deprotonation of metal bound water molecules and amide based pendant arms
作者:Sally E. Plush、Naomi A. Clear、Joseph P. Leonard、Ann-Marie Fanning、Thorfinnur Gunnlaugsson
DOI:10.1039/b923383k
日期:——
and their complexes with europium(III) were synthesised. The protonation constants and the metal ion stability constants of two of these ligands were determined by potentiometric titration. The pKa of the water molecules coordinated to the complexed metal ion were determined by both luminescent and potentiometric measurements. The luminescence pH dependence of a further three Eu(III) complexes, 5–7, which
一系列替代 1,4,7,10-四氮杂十二烷配体1-4,具有敏化作用硝基苯 或者 萘 触角,作为酰胺侧基臂之一,及其与 ((III)被合成了。通过电位滴定法测定其中两个配体的质子化常数和金属离子稳定性常数。与配位的金属离子配位的水分子的p K a通过发光和电位测量来确定。另外三个发光的pH值依赖性((III)还研究了没有任何触角的5-7配合物,目的是更好地了解金属结合物的作用水这种分子在直接激发镧系元素离子时具有这种复合物的发光特性。这些发光测量的结果表明,所有配合物的Eu(III)发射均被作为pH的函数进行了调节,我们将其归因于循环系统中离子的配位环境中发生的由金属去质子化引起的变化。边界水 分子和/或酰胺侧臂的去质子化。