双层复合体:从可见到NIR-II发光
Irene Melendo1, Pilar Borja1, Sara Fuertes1
1Instituto de Síntesis Química y Catálisis Homogénea (ISQCH), CSIC - Universidad de Zaragoza, Pedro Cerbuna 12, 50009 Zaragoza, Spain.
Inorganic chemistry
|August 22, 2025
概括
这项研究合成了 (II) 和 (III) 双核化合物. 与 (III) 化合物不同, (III) 化合物具有较短的-键,并在NIR-II区域发射光.
科学领域:
- 协调化学
- 材料科学
- 光物理学
背景情况:
- 双核复合物因其独特的结构和光物理性质而引起人们的兴趣.
- 了解结构,氧化状态和发光之间的关系对于开发新材料至关重要.
研究的目的:
- 合成和描述新的双核 (II) 和 (III) 化合物.
- 研究两个氧化状态之间的结构差异,特别是-键.
- 探索这些复合物的光物理性质,包括辐射波长和电子转换.
主要方法:
- 单核前体的合成,然后二聚化形成Pt (II) 二核复合物.
- 使用水性酸将Pt(II) 复合物氧化为Pt(III) 双核衍生物.
- 用X射线结晶学进行结构测定.
- 对光物理性质的实验和理论研究 (DFT,TD-DFT).
主要成果:
- 成功合成了Pt(II) 双核复合物[{Pt(C^N) -S^N) ]和它们的氧化Pt(III) 对应物[{Pt(C^N) -S^N) X}2].
- X射线结构显示较短的Pt-Pt距离 (约. 在Pt (III) 复合体中2.7 Å) 与Pt (II) 复合体 (约. 在前者中表示Pt-Pt债券.
- 在可见区域 (640-685 nm) 发出3ππ*和3MMLCT的复合体.
- Pt(III) 复合体在 NIR-II 区域 (高达 1215 nm) 具有 3XMMCT 特性,受到轴联体和轨道重叠的影响.
结论:
- 氧化状态显著影响双核复合物的Pt-Pt键长度和光物理性质.
- 带有 Pt-Pt 键的 Pt-III 复合体显示了与 3XMMCT 转换有关的独特的 NIR-II 排放.
- 辐射能量可以通过轴联体和辅助联体的性质进行调整,为光电子应用提供了潜力.
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