A [Cyclentetrakis(methylene)]tetrakis[2-hydroxybenzamide] Ligand That Complexes and Sensitizes Lanthanide(III) Ions
作者:Anthony D'Aléo、Jide Xu、King Do、Gilles Muller、Kennethâ
N. Raymond
DOI:10.1002/hlca.200900161
日期:2009.11
metal‐complex species are present in solution, whose relative amounts are pH dependent. At pH>8.0, an intense long‐lived emission is observed (for [TbL1] and [YbL1]), while at pH<8.0, a weaker, shorter‐lived species predominates. Unconventional LnIII emitters (Pr, Nd, Sm, Dy, and Tm) were sensitized in basic solution, both in the VIS and in the near‐IR, to measure the emission of these ions.
描述了含有四个 2-羟基苯甲酰胺基团的 Cyclen衍生物 H 4 L 1 ⋅2 HBr的合成。L 1的 Ln III配合物(Ln=Gd、Tb、Yb 和 Eu)的光谱特性揭示了 UV/VIS 吸收、圆二色性吸收、发光和圆偏振发光光谱的变化。结果表明,溶液中至少存在两种金属络合物,其相对量取决于 pH 值。在 pH>8.0 时,观察到强烈的长寿命发射(对于 [Tb L 1 ] 和 [Yb L 1 ]),而在 pH <8.0 时,较弱、寿命较短的物质占主导地位。非常规 Ln III 发射体(Pr、Nd、Sm、Dy 和 Tm)在碱性溶液中敏化,包括可见光和近红外,以测量这些离子的发射。