A series of lanthanide complexes has been prepared from ligands constructed from a bis-pyrazolyl-pyridine core bearing various chelating arms with anionic mixed carboxylate/phosphonate or phosphonate substituents. These ligands form particularly stable complexes with Eu(III) and Tb(III) which display outstanding spectroscopic properties, with excited state lifetimes ranging from 2.6 to 3.2 ms and quantum yields in the 16 to 48% range in water or phosphate buffer. The complexes are significantly more stable than those of analogous ligands bearing only carboxylate groups. Some of the new ligands have a central and flexible pendent link suitable for bio-labelling.
一系列
镧系元素配合物是由双
吡唑基
吡啶核心
配体与带有阴离子混合
羧酸盐/
膦酸盐或
膦酸盐取代基的各种螯合臂制备而成的。这些
配体与 Eu(III)和 Tb(III)形成特别稳定的配合物,显示出卓越的光谱特性,在
水或
磷酸盐缓冲液中的激发态寿命为 2.6 至 3.2 毫秒,量子产率为 16% 至 48%。这些配合物的稳定性明显高于只含有羧基的类似
配体。其中一些新
配体具有适用于
生物标记的中心和柔性悬垂连接。