具有0,+1,+2或+3电荷的NIR发射Yb(III) 复合体中的敏感化路径
Emilie Mathieu1, Salauat R Kiraev1, Daniel Kovacs1
1Department of Chemistry, Ångström Laboratory, Uppsala University, Box 523, 75120 Uppsala, Sweden.
Journal of the American Chemical Society
|November 8, 2022
概括
具有宏循环配体的新伊特 (III) 复合体显示可调节的发光. 研究人员探索了连接物修饰如何影响Yb (III) 敏感化和减少潜力,尽管电荷不同,但发现了一致的发光效率.
科学领域:
- 协调化学
- 光物理学
- 兰化物复合物
背景情况:
- 宏环对稳定金属离子至关重要.
- 碳酸染色体用于兰坦化物敏感化.
- 调节电荷和供体组对复杂的属性产生影响.
研究的目的:
- 合成 Yb(III) 复合物与宏环联体和碳酸染色体.
- 研究连接剂捐赠组 (碳酸盐与碳胺) 和整体电荷对复杂性能的影响.
- 分析Yb (III) /Yb (II) 的降解潜力和Yb (III) 的发光敏感度.
主要方法:
- 合成含有1,4,7,10-tetraazacyclododecane衍生物的Yb(III) 复合物.
- 准磁性1H核磁共振光谱测定协调几何.
- 循环电压测量用于测量还原潜力.
- 光发光谱测量灵敏度和量子产量.
主要成果:
- 协调几何在很大程度上不受碳酸盐/胺基替代的影响.
- Yb(III) /Yb(II) 降解潜力随着复杂的电荷转移,变得更容易减少更多的正电荷.
- 在所有复合体中,碳烯激发导致了Yb (III) 光.
- 观察到由光诱导的电子转移 (PeT) 从碳酸到Yb (III),由碳酸的光度降低证明.
- 发光量子产量通常是恒定的,除了含有甲基化胺的+3充电复合物,该复合物显示出增强的辐射.
- NH振动灭了Yb(III) 排放,而更快的PeT由于竞争的声子辅助能量转移 (PAEnT) 没有提高敏感性效率.
结论:
- 连接体设计可以控制Yb(III) 复杂性质,包括还原潜力.
- 光诱导的电子转移和声子辅助的能量转移在Yb (III) 敏感化中起着重要作用.
- 尽管存在诸如NH振动火等挑战,但Yb (III) 复合物仍然是有前途的发光材料.
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