太阳能应用的新Rh2II,II复合物:泛色吸收和激发状态反应性
Tyler J Whittemore1, Hannah J Sayre1, Congcong Xue1
1Department of Chemistry and Biochemistry, The Ohio State University , Columbus, Ohio 43210, United States.
Journal of the American Chemical Society
|October 5, 2017
概括
新的轮复合体显示强烈的紫外线可见光吸收,使其成为太阳能转化和光催化应用的有希望的染料.
科学领域:
- 无机化学
- 材料科学
- 摄影化学
背景情况:
- 轮复合物以其独特的电子和光物理特性而闻名.
- 尤其是复合物,因为它们的催化和光采集能力引起了人们的兴趣.
- 开发用于太阳能转换的新材料需要具有可调节性能的高效吸光器.
研究的目的:
- 合成和表征新型异构轮复合物.
- 研究这些复合物的光物理和电化学特性.
- 评估它们作为太阳能转化和光催化剂的潜力.
主要方法:
- 合成和表征cis-[Rh2(μ-form) 2 ((μ-np) 2) [BF4]2和cis-Rh2 ((μ-form) 2 ((μ-npCOO) 2) 复合物.
- 紫外线-Vis吸收光谱以确定光吸收配置文件.
- 超快速和纳秒短暂的吸收和时间分辨率的红外光谱,以研究激发状态的动态.
- 能量转移灭实验以估计三重激发状态的能量.
- 电化学方法来确定氧化还原潜力.
主要成果:
- 已经成功合成和表征了四种新的异构轮复合物.
- 复合体具有强大的泛色光吸收从紫外线到可见区域 (高达640nm).
- 观察到单体和三体金属/配体对配体电荷转移 (ML-LCT) 激发状态.
- npCOO-复合体显示红移吸收到近红外线,并经历光启动的电子转移.
- 三重激发状态能量范围从1.83到0.78 eV,具有确定的氧化还原潜力.
结论:
- 这些新复合体代表了一类新的吸光器.
- 它们的广泛吸收和有利的激发状态特性使它们适合太阳能应用.
- 潜在的应用包括在太阳能电池中注入电荷的染料和光催化剂.
- 这些复合体在紫外线辐射到大约800nm时有效工作.
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