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基于对称性破坏电荷分离的COT化烯二氧化对环境敏感的光

Ryo Kimura¹, Yusuke Yoneda², Hikaru Kuramochi³

¹Graduate School of Science, Kyoto University, Kitashirakawa Oiwake, Sakyo, Kyoto, 606-8502, Japan.

Photochemical & photobiological sciences : Official journal of the European Photochemistry Association and the European Society for Photobiology

|September 1, 2023

概括

研究人员开发了新的动分子 (FLAP) 与纳夫托-烯基二氧化物翅膀. 这些分子通过电荷分离表现出独特的光火,与以前的设计不同.

科学领域:

摄影化学的使用.
有机化学有机化学
材料科学材料科学材料科学

背景情况:

灵活和芳香光功能系统 (FLAP) 是具有动的刚性芳香翼和中心灵活环的分子,类似于循环环烯 (COT).
这些系统表现出有趣的动态行为,并已被积极研究.

研究的目的:

为了合成和研究一种新的FLAP分子,NPBI-FLAP,它具有纳夫托-烯比西米德 (NPBI) 翅膀和两个并排的烯单元.
为了制备一个参考化合物,NPBI-COT,用单个烯单元合到COT.
了解这些新型NPBI-FLAP和NPBI-COT系统的光物理特性和兴奋状态动态.

主要方法:

对NPBI-FLAP和NPBI-COT分子的合成.
光谱分析包括对环境敏感的光.
电化学测量 (还原/氧化).
五秒秒短暂吸收光谱学.

主要成果:

在极性溶剂中,NPBI-FLAP和NPBI-COT都表现出显著的光火和缩短的光寿命.
在NPBI-FLAP中光火是由于快速对称破坏电荷分离 (SB-CS).
在NPBI-COT中,分子内电荷转移 (ICT) 被确定为光火的机制.
在这些化合物中激发的物种通过曲的几何形状衰变,与之前报告的相关系统不同.

结论:

COT与不同π系统的融合方式显著影响光物理性质和兴奋状态动态.
NPBI-FLAP和NPBI-COT代表具有不同光动力学行为的新功能分子.
这些发现为通过控制分子架构来设计新型光功能材料打开了道路.

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