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首页> 外文期刊>Dalton transactions: An international journal of inorganic chemistry >Sensitised near-IR lanthanide luminescence exploiting anthraquinone-derivedchromophores: syntheses and spectroscopic properties
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Sensitised near-IR lanthanide luminescence exploiting anthraquinone-derivedchromophores: syntheses and spectroscopic properties

机译:利用蒽醌衍生的生色团敏化近红外镧系元素:合成和光谱性质

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摘要

The syntheses of two anthraquinone-derived tetraaza macrocyclic ligands (LI via1-amino-9,10-anthraquinone and L2 via 1-amino-4-hydroxy-9,10-anthraquinone) together with theircorresponding Ln~(III) complexes,Ln-L1/2(Ln = Nd~(III) , Gd~(III) , Er~(III),Yb~(III), are described. Both Ln-L1 (λ_(max) ≈ 380 nm) and Ln-L2 (λ_max≈450 nm) complexes absorb in the visible region with good extinctioncoefficients (ε_vis> 2 x 10~3 M~(-1) cm~(-1 ). Phosphorescence measurements on Gd-L1/2 at 77 K allowed theligand-centred triplet states to be estimated at ca. 22000 cm~(-1)and 19800 cm~(-1) forGd-L1and Gd-L2respectively. Steady state and time-resolved measurements showed that both chromophores sensitisedNd~(III), Er~(III) and Yb~(III) ions, resulting in observable near-IR emission. Preliminary studies on thepH-dependent behaviour of the L2 derivatives demonstrated that deprotonation of the 4-hydroxylgroup at pH 12 resulted in a significant bathochromic shift in the absorption profile, thus allowingsensitised near-IR emission utilising λ_(ex) = 575 nm.
机译:两种蒽醌衍生的四氮杂大环配体(L1-经由1-氨基-9,10-蒽醌和L2经由1-氨基-4-羟基-9,10-蒽醌)及其相应的Ln〜(III)配合物,Ln-的合成描述了L1 / 2(Ln = Nd〜(III),Gd〜(III),Er〜(III),Yb〜(III)。Ln-L1(λ_(max)≈380 nm)和Ln-L2 (λ_max≈450nm)配合物在可见光区具有良好的消光系数(ε_vis> 2 x 10〜3 M〜(-1)cm〜(-1)。Gd-L1 / 2在77 K处的磷光测量允许配体- Gd-L1和Gd-L2的中心三重态分别估计在22000 cm〜(-1)和19800 cm〜(-1)处,稳态和时间分辨测量表明,这两个生色团都对Nd〜(III),Er〜敏感(III)和Yb〜(III)离子,导致可观察到的近红外发射。对L2衍生物的pH依赖行为的初步研究表明,在pH 12时4-羟基的去质子化导致吸收中的显着红移。配置文件,从而允许sensi利用λ_(ex)= 575 nm进行近红外发射。

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