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首页> 外文期刊>Polyhedron: The International Journal for Inorganic and Organometallic Chemistry >Functional luminescent lanthanide complexes: Modulation of visible luminescence from europium complexes
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Functional luminescent lanthanide complexes: Modulation of visible luminescence from europium complexes

机译：功能性发光镧系元素络合物：euro络合物的可见光调制

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摘要

The syntheses of three new ligands (L1-3), which are based upon a DO3A core and appended with additional receptor sites for metal cations, are described, together with their corresponding Eu(III) complexes (Eu-L _(1-3)). The complexes are visibly luminescent in aqueous solution, following sensitization via the pyridine chromophore, showing characteristic narrow line-like emission from Eu(III). The luminescence properties show that water is effectively excluded from the inner coordination sphere of europium (q = 0). Each of the complexes showed perturbed luminescence properties upon addition of a variety of d-block metal ions. For example, emission quenching was observed for each complex following addition of Cr(III) and Cu(II). Selectivity towards Hg(II) (over Cd(II), Cu(II) and Zn(II)) was demonstrated with Eu- L~3, which possesses a receptor site incorporating a softer thiophene moiety. More specifically, Hg(II) binding resulted in changes in the form of the steady state emission spectrum, together with a corresponding reduction of the luminescence lifetime in water, which can be attributed to an increase in inner sphere hydration (q = 2) and thus enhanced non-radiative deactivation of the ~5D_0 state by proximate O-H oscillators.
机译：描述了三个新的配体（L1-3）的合成，它们基于DO3A核心并附加了金属阳离子的其他受体位点，以及它们相应的Eu（III）配合物（Eu-L _（1-3 ））。通过吡啶发色团敏化后，络合物在水溶液中明显发光，显示出从Eu（III）发出的特征性窄线状发射。发光特性表明，水被有效地排除在euro的内部配位域中（q = 0）。在添加各种d嵌段金属离子后，每种络合物均表现出扰动的发光特性。例如，在添加Cr（III）和Cu（II）之后，观察到每种配合物的发射猝灭。用Eu-L〜3证明了对Hg（II）（对Cd（II），Cu（II）和Zn（II）的选择性），它具有一个结合了较软噻吩部分的受体位点。更具体地说，Hg（II）的结合导致稳态发射光谱形式的变化，以及相应的水中发光寿命的减少，这可以归因于内球水合的增加（q = 2）和因此，邻近的OH振荡器增强了〜5D_0状态的非辐射失活。

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