Comparative study of the constitution and chiroptical properties of emissive terbium and europium complexes with a common tetraazatriphenylene sensitiser; the nature of the sensitiser determines quenching sensitivity and cellular uptake
作者:Elizabeth J. New、David Parker、Robert D. Peacock
DOI:10.1039/b816173a
日期:——
Six pairs of Eu(III) and Tb(III) complexes of macrocyclic ligands, incorporating a common tetraazatriphenylene sensitiser, have been examined in terms of their solution structure, sensitivity to excited state quenching, protein affinity, cell toxicity and preliminary cell localisation profiles. A complex with three (S)-phenylalanine-derived ligating groups possesses distinctive 1H NMR, Eu emission and circularly polarised emission properties, consistent with a unique Λ-configuration in the 9-coordinate complex, where an amide carbonyl group occupies the capping position of the coordination polyhedron. Each complex possesses similar sensitivity to quenching by ascorbate, urate and iodide, has similar toxicity behaviour and shows a common intracellular localisation profile that is consistent with compartmentalisation in lysosomes or late endosomes. Such behaviour accords with the hypothesis that it is the nature of the sensitising moiety that determines each of these properties.
六对大环配体的 Eu(III) 和 Tb(III) 配合物,结合了常见的四氮杂苯并菲敏化剂,已对其溶液结构、对激发态猝灭的敏感性、蛋白质亲和力、细胞毒性和初步细胞定位特征进行了检查。具有三个 (S)-苯丙氨酸衍生的连接基团的复合物具有独特的 1H NMR、Eu 发射和圆偏振发射特性,与 9 配位复合物中独特的 Λ 构型一致,其中酰胺羰基占据了配位多面体。每种复合物对抗坏血酸、尿酸盐和碘化物的猝灭具有相似的敏感性,具有相似的毒性行为,并显示出与溶酶体或晚期内涵体中的区室化一致的共同的细胞内定位特征。这种行为符合以下假设:敏化部分的性质决定了这些特性中的每一个。