用于高三聚能分子内单片裂变的可溶性二乙烯二聚体
Oliver Millington1,2, Stephanie Montanaro1, Anastasia Leventis1
1Department of Chemistry, University of Cambridge, CambridgeCB2 1EW, U.K.
Journal of the American Chemical Society
|January 23, 2023
概括
研究人员探索了分子内单片裂变 (iSF) 以实现有效的太阳能转化. 基于1,6-二-1,3,5-二烯的新型三重能量分子显示出iSF活性, 这对于下一代光伏至关重要.
科学领域:
- 摄影化学
- 材料科学
- 有机电子
背景情况:
- 分子内单子裂变 (iSF) 将一个高能单子激子转化为一个单分子内的两个低能三重激子.
- 在单片裂变增强的光伏设备中,高三重能量对于高效的激子转移至关重要,但许多当前的材料缺乏这一点.
- 1,6-二-1,3,5-六烯 (DPH) 是一种具有高三倍能量的有前途的染色体 (∼1.5 eV) 用于iSF应用.
研究的目的:
- 设计,合成和描述用于分子内单片裂变 (iSF) 的基于DPH的新型二极体.
- 研究分子结构,合几何学和iSF效率之间的关系.
- 评估这些材料在单片裂变增强光伏应用中的潜力.
主要方法:
- 合成六种基于DPH的新型分子二元体.
- 暂时吸收光谱用于研究激发状态动态和测量单片裂变速率.
- 光终生研究以确定三倍产量.
主要成果:
- 在6个合成的二元体中,有5个表现出分子内单片裂变活性.
- 单片裂变时间常数在7 ± 2 psi到2.2 ± 0.2 ns之间.
- 在最有效的二次体中,最大的三倍率为163 ± 63%.
- 单片裂变的速度高度依赖于合几何形状,近距离和最小的透过键通信是最佳的.
结论:
- 新型DPH二分离体显示出高分子单片裂变和高三片产量.
- 优化分子几何学对于平衡单片裂变速率与反向重组至关重要.
- 这些发现为开发先进的光伏技术提供了高三重能量材料的途径.
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