Dynamic Electron Polarization Lasting More Than 10 μs by Hybridizing Porphyrin and TEMPO with Flexible Linkers

• DOI: 10.1021/acs.jpcb.2c07936
• Publication Date: 2023-01-31T01:04:06Z
• Authors: Koki Nishimura; Reiya Yabuki; Tomoyuki Hamachi; Nobuo Kimizuka; Kenichiro Tateishi; Tomohiro Uesaka; Nobuhiro Yanai
• Keywords: Linker

Dynamic electron polarization (DEP), induced by quenching of photoexcited species stable radicals, can hyperpolarize spins in solution at room temperature. Recently, development technologies based on spin such as dynamic nuclear (DNP) has been progressing, where it is important to design molecules that achieve long-lasting DEP addition high DEP. Hybridization linking dyes and radicals a promising approach for efficient DEP, but strong interactions between neighboring often result the rapid decay In this study, we introduce flexible linker into hybrid system porphyrin TEMPO both The structural flexibility switches interaction radical triplet, which promotes process bringing triplet close proximity, while avoiding abrupt relaxation due interactions. As result, new hybridized exhibits larger than unlinked system, same time achieving lasting more 10 μs.