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首页> 外文期刊>Dalton transactions: An international journal of inorganic chemistry >Coumarin-based luminescent ligand that forms helicates with dicationic metal ions
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Coumarin-based luminescent ligand that forms helicates with dicationic metal ions

机译:香豆素基发光配体与金属离子形成螺旋

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摘要

The potentially hexadentate ligand L, which contains two terminal coumarin fluorophores, forms dinuclear double-stranded helicates with dicationic metal ions, giving species of the generic form [M_2L_2]~ (4+). In solution the free ligand was fluorescent with emission attributed to the coumarin fluorophores (λ_(em) = 437 nm). The luminescent properties of the corresponding dimetallic helicates complexes were examined and revealed that the Zn~(2+) complex demonstrates enhanced emission when compared to the parent ligand, whereas Co~(2+), Cu~ (2+), Cd~(2+) and Hg~(2+) induce varying degrees of fluorescence quenching. In particular, comparative luminescence measurements at 77 K and room temperature showed that the quenching mechanism for [Cu_ 2L_2]~(4+) can be attributed to a photoinduced electron transfer. ESI-MS selectivity studies showed that in the presence of a mixture of metal dications no preference for any one metal ion was observed.
机译:含有两个末端香豆素荧光团的潜在六齿配体L与金属离子形成双核双链螺旋,给出了一般形式的[M_2L_2]〜(4+)物种。在溶液中,游离配体发荧光,其发射归因于香豆素荧光团(λ_(em)= 437 nm)。检查了相应的双金属螺旋配合物的发光性能,发现与母体配体相比,Zn〜(2+)配合物显示出增强的发射,而Co〜(2 +),Cu〜(2 +),Cd〜( 2+)和Hg〜(2+)诱导不同程度的荧光猝灭。尤其是,在77 K和室温下进行的比较发光测量表明,[Cu_2L_2]〜(4+)的猝灭机理可归因于光诱导的电子转移。 ESI-MS选择性研究表明,在金属指示剂混合物的存在下,未观察到对任何一种金属离子的偏爱。

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