Li Xiaogang, Zhang Dong, Li Jing
Industrial & Commercial College, Hebei University, Baoding 071000, China.
Institute of Penology, The Central Institute for Correctional Police, Baoding 071000, China.
Spectrochim Acta A Mol Biomol Spectrosc. 2014 Jun 5;127:1-9. doi: 10.1016/j.saa.2014.02.042. Epub 2014 Feb 24.
In this paper, a series of Eu(III) complexes based on four diamine ligands and two diketone ligands were synthesized. Their single crystal structures were studied, where intermolecular π-π stacking was found. The photophysical parameters of these Eu(III) complexes were measured, along with their ligand triplet levels. The energy transfer mechanism between ligand and metal center was discussed in detail. Energy transfer roll-back was found in Eu(III) complexes owing large-conjugated diamine ligands, compromising emissive performance. This energy transfer roll-back, however, could be stopped by the presence of AcO anion, leading to Eu(III) complex emission enhancement. The sensing performance of such Eu(III) complexes was thus investigated in detail. High sensitivity and selectivity were observed.
本文合成了一系列基于四种二胺配体和两种二酮配体的铕（III）配合物。研究了它们的单晶结构，发现了分子间的π-π堆积。测量了这些铕（III）配合物的光物理参数及其配体三线态能级。详细讨论了配体与金属中心之间的能量转移机制。由于存在大共轭二胺配体，在铕（III）配合物中发现了能量转移回滚现象，这损害了发光性能。然而，这种能量转移回滚可以通过醋酸根阴离子的存在而停止，从而导致铕（III）配合物的发射增强。因此，详细研究了此类铕（III）配合物的传感性能。观察到了高灵敏度和高选择性。
