Synthesis and Luminescent Properties of Novel Lanthanide(III) β-Diketone Complexes with Nitrogen <i>p</i>,<i>p</i>‘-Disubstituted Aromatic Ligands
作者:Anna Bellusci、Giovanna Barberio、Alessandra Crispini、Mauro Ghedini、Massimo La Deda、Daniela Pucci
DOI:10.1021/ic048951r
日期:2005.3.21
those found for the crystal structures containing the fragments [Ln(III)(phen)] and [Ln(III)(bipy)] obtained from the Cambridge Structural Database. The influence exerted by the electron-attracting groups on the coordination ability of the ligands, that in some cases becomes lack of coordination of the lanthanide ions, has been also detected in solution where the loss of the ligand has been followed
通式为[Ln(acac)3 L(m)]的三-β-二酮丙酮酸镧系元素(Ln)络合物(Ln = Eu,Er,Yb,Tb),具有螯合配体,例如4,7-二取代-1,已经合成并充分表征了10-菲咯啉和4,4'-二取代-2,2'-联吡啶。在固态和溶液态下都已研究了对位取代基对芳族N供体配体的诱导作用。已确定1,10-菲咯啉-4,7-二羧酸二乙酯euro和4,4'-二甲氧基-2,2'-联吡啶衍生物的单晶X射线结构,揭示了四方棱柱形几何形状的扭曲。在两种情况下都是镧系元素原子。p,p'施加的影响 讨论了关于Ln-N键距离上氮配位原子的取代基-比较了几何参数与包含碎片[Ln(III)(phen)]和[Ln(III)(bipy)的晶体结构所发现的几何参数]从剑桥结构数据库获得。吸电子基团对配体配位能力的影响(在某些情况下会导致镧系元素离子失去配位作用)也已在溶液中进行了检测,其中配体的损失已通过紫外-可见光谱法进行了研究。