电子提取组作为功能化特皮里丁基联体中的属性调器在Eu (III) 和Tb (III) 复合体中
Oksana Fizer1, Sina Chiniforoush2, Thomas J Summers2
1Department of Chemistry, University of Nevada, Reno, 1664 N. Virginia Street, Reno, NV 89557, USA. abd@unr.edu.
在特皮里丁配体上,取电子的组会影响兰坦化物复合物的稳定性和光物理. 替代效应与能量传输速率和排放寿命相关,揭示了对复杂行为的洞察力.
科学领域:
- 协调化学 协调化学
- 光物理学的光学物理学
- 兰化物复合物 兰化物复合物
背景情况:
- 特皮里丁连接体是兰坦化离子的多功能化剂.
- 电子吸收组可以调整连接体和复杂性质.
- 了解替代物效应对于设计发光胺复合物至关重要.
研究的目的:
- 为了合成和表征特皮里丁衍生物与整形替代剂 (NO2,CHO,Br).
- 调查这些替代剂对Eu (III),Tb (III) 和Dy (III) 复合物的化学和光物理性能的影响.
- 为了将这些特性与未被替代的特皮里丁复合物进行比较.
主要方法:
- 合成和分离的 terpyridine 衍生物和它们的 lanthanide 复合物.
- 复杂稳定常数和配体pKa值的确定.
- 光物理特征包括排放量子产量和寿命.
- 贾德-奥菲尔特参数计算和能量转移速率分析.
- 核磁共振 (NMR) 光谱和密度功能理论 (DFT) 计算.
主要成果:
- 在复杂稳定性和联结体pKa值之间发现了直接相关性.
- 排放量子收益率表明金属中心排放的适度敏感性.
- 计算了Judd-Ofelt参数和能量转移速率,显示了前期能量转移和对Eu (III) 复合物的敏感度之间的相关性.
- 对于Tb(III) 复合体,反向能量转移占主导地位.
- 在298K的排放寿命是单指数的,但在77K观察到双指数的衰变.
- 核磁共振和DFT研究表明,在低温下结合体解复和旋转.
结论:
- 氨酸连接体上的整形替代剂显著影响兰坦化复合物的稳定性和光物理行为.
- 在Eu (III) 和Tb (III) 复合体之间,能量转移动态不同.
- 温度依赖的排放衰变表明冷溶液中的结构动态和潜在解复.
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