The effect of the linker size in <i>C</i><sub>2</sub>-symmetrical chiral ligands on the self-assembly formation of luminescent triple-stranded di-metallic Eu(<scp>iii</scp>) helicates in solution
作者:Oxana Kotova、Steve Comby、Komala Pandurangan、Floriana Stomeo、John E. O'Brien、Martin Feeney、Robert D. Peacock、Colin P. McCoy、Thorfinnur Gunnlaugsson
DOI:10.1039/c8dt02753f
日期:——
studied at higher concentration by following the changes in the 1H NMR spectra of the ligands upon Eu(III) addition, as well as by using MALDI-MS of the isolated solid state complexes. The chiroptical properties of the ligands were used in order to study the structural changes upon self-assembly between the ligands and Eu(III) ions using circular dichroism (CD) and circularly polarised luminescence
考虑到基于手性镧系元素的超分子结构在成像,传感和其他功能目的中的应用,该结构已经获得了重要的意义。我们基于两个2,6-吡啶-二羧酸-酰胺部分(pda)的使用,设计了手性C 2对称配体(L),它们之间的区别在于二胺间隔基的性质(从1,3 -苯二甲胺(1(S,S),2(R,R))和苯-1,3-二胺(3(S,S),4(R,R)))到这两个pda单元之间的更大体积的4,4'-(环己烷-1,1-二基)双(2,6-二甲基苯胺)(5(S,S),6(R,R)))。在低浓度的CH 3 CN溶液中研究了L和Eu(III)离子之间的自组装,从而通过吸收度,荧光和以Eu(III)为中心的发射光谱的变化,我们可以对溶液中发生的结合平衡进行建模到[ Eu:L 2 ],[ Eu 2:L 2 ],[ Eu 2:L 3 ]组装,并揭示了它们的高结合常数值。还通过跟踪Eu(III)加入后配体的1 H NMR谱变化以及使用分离