在金属交换双核复合体中,能量转移由不对称的配体共价连接在一起
Weijun Dai1, Shiwen Yu1, Wen Xu1
1College of Chemistry and Environmental Science, Qujing Normal University, Qujing 655011, China. jjliu302@163.com.
Dalton transactions (Cambridge, England : 2003)
|November 7, 2023
概括
新的不对称桥梁连接物使发光金属交换复合物的合成成为可能. 这些和复合体表现出独特的光物理特性和高效的分子内部能量转移,推进了发光分子设计.
科学领域:
- 协调化学 协调化学
- 材料科学 材料科学 材料科学
- 光物理学的光学物理学
背景情况:
- 用 π 结合联结体复合是一种创建发光分子的关键策略.
- 设计复杂的连接物对于控制金属复合物的特性至关重要.
研究的目的:
- 设计和合成用于金属交换复合体的新型不对称桥接联体 (L1和L2).
- 研究合成的单金属,同金属和异金属复合物的结构,光物理和能量传输特性.
主要方法:
- 合成不对称的桥梁配体L1和L2,其中包括2,2'-双二和1,10-类素部分.
- 使用 (Ru) 和 (Os) 中心制备单金属,同金属和异金属复合物.
- 使用密度函数理论 (DFT) 计算来进行几何优化的表征.
- 光谱分析 (UV-Vis吸收和发射) 用于确定光物理性质.
主要成果:
- 成功合成了一系列基于Ru和Os的单金属,同金属和异金属复合物.
- 综合体C3-C10在Ru (II) 或Os (II) 中心周围显示了不同的八面体扭曲,与DFT预测一致.
- 所有的复合体都显示出在288 nm (以基为中心) 左右的强吸收和基于Ru的MLCT吸收 (440-450 nm).
- 异金属复合物 (C5,C6,C9,C10) 呈现出基于的吸收 (565-583 nm).
- 在异金属复合体C5和C6中观察到从Ru(II) 到Os(II) 的分子内能量转移.
结论:
- 设计的不对称的桥梁连接物有效地促进了各种金属交换复合物的合成.
- 合成的复合物具有可调节的光物理性质,包括明显的吸收带和分子内能量转移.
- 这项工作为开发基于金属聚氨酸复合物的先进发光材料提供了基础.
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