Aryl bridged 1-hydroxypyridin-2-one: effect of the bridge on the Eu(III) sensitization process.
Aryl bridged 1-hydroxypyridin-2-one: effect of the bridge on the Eu(III) sensitization process.
复制标题
DOI：
10.1021/ic901161z
复制
发表时间：
2009-10-05
影响因子：
4.6
通讯作者：
Raymond, Kenneth N.
中科院分区：
文献类型：
--
作者：
D'Aleo, Anthony;Moore, Evan G.;Szigethy, Geza;Xu, Jide;Raymond, Kenneth N.
通过天线配体的能量转移而产生的 Eu3+ 发光效率很大程度上取决于金属离子的配位几何形状。 Eu(III) 敏化的几何成分已使用一系列由不同长度和几何形状的桥连接的四齿 1,2-HOPO 衍生物进行了探测。配体为N,N'-(1,2-亚苯基)双(1-羟基-6-氧代-1,6-二氢吡啶-2-甲酰胺)配体(L1)，1-羟基-N-(2-(1-羟基-6-氧代-1,6-二氢吡啶-2-甲酰胺基)苯甲基)-6-氧代-1,6-二氢吡啶-2-甲酰胺(L2) 和 N,N’-(1,2-亚苯基双(亚甲基))双(1-羟基-6-氧代-1,6-二氢吡啶-2-甲酰胺)(L3)。完成了 Gd(III) 和 Eu(III) 金属配合物的光谱表征、模型化合物的 TD-DFT 分析以及铕发射动力学参数的评估。通过改变桥接单元，在发光量子产率中观察到一些显着的差异。 [Eu(L2)2]− 衍生物显示出有效的敏化作用以及良好的金属中心发射。对于[Eu(L3)2]−，与[Eu(L2)2]−相比，发光量子产率的大幅猝灭主要是由于一个内球水分子与铕阳离子结合的结果，而对于[Eu(L1)2]−，低发光量子产率可归因于铕离子的低效敏化。
The efficiency of Eu3+ luminescence by energy transfer from an antenna ligand can be strongly dependent on the metal ion coordination geometry. The geometric component of the Eu(III) sensitization has been probed using series of tetradentate 1,2-HOPO derivatives that are connected by bridges of varying length and geometry. The ligands are N,N’-(1,2-phenylene)bis(1-hydroxy-6-oxo-1,6-dihydropyridine-2-carboxamide) for the ligand (L1), 1-hydroxy-N-(2-(1-hydroxy-6-oxo-1,6-dihydropyridine-2-carboxamido)benzyl)-6-oxo-1,6-dihydropyridine-2-carboxamide (L2) and N,N’-(1,2-phenylenebis(methylene))bis(1-hydroxy-6-oxo-1,6-dihydropyridine-2-carboxamide) (L3). Spectroscopic characterization of both the Gd(III) and Eu(III) metal complexes, TD-DFT analysis of model compounds and evaluation of the kinetic parameters for the europium emission were completed. Some striking differences were observed in the luminescence quantum yield by altering the bridging unit. The [Eu(L2)2]− derivative shows efficient sensitization coupled with good metal centered emission. For [Eu(L3)2]−, the large quenching of the luminescence quantum yield compared to [Eu(L2)2]− is primarily a result of one inner sphere water molecule bound to the europium cation while for [Eu(L1)2]−, the low luminescence quantum yield can be attributed to inefficient sensitization of the europium ion.
登录
查看更多内容
影响因子：
4.6
作者：
Jocher CJ;Moore EG;Pierce JD;Raymond KN
通讯作者：
Raymond KN
影响因子：
7.4
作者：
Borisov, Sergey M.;Wolfbeis, Otto S.
通讯作者：
Wolfbeis, Otto S.
影响因子：
3.9
作者：
Moynihan, S.;Van Deun, R.;Redmond, G.
通讯作者：
Redmond, G.
影响因子：
4.6
作者：
SCARROW, RC;RILEY, PE;RAYMOND, KN
通讯作者：
RAYMOND, KN
影响因子：
15
作者：
Petoud, S;Cohen, SM;Raymond, KN
通讯作者：
Raymond, KN