((II) 光的类似物 ((II) 复合物与皮秒激发状态衰变的复合物
Tomohiro Ogawa1,2, Oliver S Wenger1
1Department of Chemistry, University of Basel, St. Johanns-Ring 19, 4056, Basel, Switzerland.
Angewandte Chemie (International ed. in English)
|September 21, 2023
概括
(II) 复合物为 (II) 提供了一个可持续的替代品,用于照明和光催化. (Ni) 复合体中的结构扭曲导致快速的,非发射激发状态,与它们的发光Pt (II) 对应物不同.
科学领域:
- 无机化学 无机化学
- 摄影化学的使用.
- 材料科学 材料科学 材料科学
背景情况:
- 方形平面 (II) 复合体是照明和光催化中的关键光.
- (II) 复合物被探索为成本效益和可持续替代 (II) 的替代品.
- 了解兴奋状态动态是开发新发光材料的关键.
研究的目的:
- 为了研究正方形平面 (II) 复合物的兴奋状态行为.
- 为了比较Ni(II) 复合体与同结构发光Pt(II) 复合体的光物理性质.
- 确定控制Ni (II) 复合体中兴奋状态放松通路的因素.
主要方法:
- 超快速光谱检测兴奋状态动态.
- 计算建模以了解电子结构和能量水平.
- 同构结构Ni (II) 和Pt (II) 复合物的合成和表征.
主要成果:
- (II) 复合物从单片金属到联体电荷转移 (1MLCT) 状态到金属中心 (3MC) 兴奋状态 (<1 ps) 呈现快速衰变.
- 在Ni (II) 复合体中的3MC状态经历非辐射放松到921 ps.内的基本状态.
- 在Ni(II) 复合体中的结构扭曲降低了3MC状态的能量,阻止了在Pt(II) 类型中观察到的发射三重体联体中心 (3LC) 状态的人口.
结论:
- (II) 复合物的独特兴奋状态行为归因于导致低,非排放的3MC状态的结构扭曲.
- 通过刚性协调环境和更强的连接体场来限制结构扭曲,可以使Ni (II) 复合体中的可访问的发光3LC或3MLCT状态成为可能.
- 这些发现为在光物理和光化学应用中利用Ni (II) 复合物铺平了道路.
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