Ground and excited state chiroptical properties of enantiopure macrocyclic tetranaphthyl lanthanide complexes: controlled modulation of the frequency and polarisation of emitted light
作者:Rachel S. Dickens、Judith A. K. Howard、Christine L. Maupin、Janet M. Moloney、David Parker、Robert D. Peacock、James P. Riehl、Giuliano Siligardi
DOI:10.1039/a801004h
日期:——
chromophores in the chiral sodium, calcium and europium complexes of the macrocyclic tetraamide L1a/b. In constitutionally isomeric complexes involving a 2-naphthyl linkage, L2a/b, intramolecular excimer formation is observed by fluorescence emission spectroscopy as being strongest in the protonated ligand itself. The terbium and europium complexes show a well-defined circularly polarised luminescence that is
圆二色光谱显示,在大环四酰胺L 1a / b的手性钠,钙和euro配合物中,相邻的1-萘基发色团对之间发生强激子耦合。在涉及2-萘基键L 2a / b的组成异构体中,通过荧光发射光谱观察到分子内受激准分子的形成在质子化的配体本身中最强。and和euro配合物显示出明确的圆偏振发光,而与激发的性质无关:通过[Tb.L 1a ] 3+和[Tb.L 1b ] 3+中的萘基天线在300 nm处进行紫外线激发。随后进行分子内能量转移,产生镜像圆偏振发射光谱。镧系元素络合物用于以受控方式调制入射光的频率和偏振。