Efficient Sensitization of Europium, Ytterbium, and Neodymium Functionalized Tris-Dipicolinate Lanthanide Complexes through Tunable Charge-Transfer Excited States
作者:Anthony D’Aléo、Alexandre Picot、Andrew Beeby、J. A. Gareth Williams、Boris Le Guennic、Chantal Andraud、Olivier Maury
DOI:10.1021/ic8012969
日期:2008.11.17
related tris-dipicolinate europium and lutetium complexes have been prepared. The ligands present broad absorption and emission transitions in the visible spectral range unambiguously assigned to charge-transfer transitions (CT) by means of time-dependent density functional theory calculations. The photophysical properties (absorption, emission, luminescence quantum yield, and lifetime) of the corresponding
已经制备了一系列推挽式供体-π-共轭的二吡啶甲酸配体和相关的三-二吡啶甲酸ate和and络合物。通过依赖于时间的密度泛函理论计算,这些配体在可见光谱范围内呈现出宽泛的吸收和发射跃迁,这些跃迁明确地分配给电荷转移跃迁(CT)。彻底研究了相应的配合物的光物理性质(吸收,发射,发光量子产率和寿命)。溶剂变色和温度效应清楚地证实,Eu(III)敏化直接发生于配体CT状态。另外,通过改变施主片段的性质来调制CT供体状态的能量,可以确定用于for敏化的天线的最佳能量,并且发现该最佳能量接近(5)D 1接受状态。最后,这种CT敏化过程已成功地扩展到近红外发射体(钕和)。