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

Nishimura, Koki; Yabuki, Reiya; Hamachi, Tomoyuki; Kimizuka, Nobuo; Tateishi, Kenichiro; Uesaka, Tomohiro; Yanai, Nobuhiro

Nishimura, Koki; Yabuki, Reiya; Hamachi, Tomoyuki; Kimizuka, Nobuo; Tateishi, Kenichiro; Uesaka, Tomohiro; Yanai, Nobuhiro.

Afiliación

Nishimura K; Department of Chemistry and Biochemistry, Graduate School of Engineering, Center for Molecular Systems (CMS), Kyushu University, 744 Moto-oka, Nishi-ku, Fukuoka819-0395, Japan.
Yabuki R; Department of Chemistry and Biochemistry, Graduate School of Engineering, Center for Molecular Systems (CMS), Kyushu University, 744 Moto-oka, Nishi-ku, Fukuoka819-0395, Japan.
Hamachi T; Department of Chemistry and Biochemistry, Graduate School of Engineering, Center for Molecular Systems (CMS), Kyushu University, 744 Moto-oka, Nishi-ku, Fukuoka819-0395, Japan.
Kimizuka N; Department of Chemistry and Biochemistry, Graduate School of Engineering, Center for Molecular Systems (CMS), Kyushu University, 744 Moto-oka, Nishi-ku, Fukuoka819-0395, Japan.
Tateishi K; Cluster for Pioneering Research, RIKEN, RIKEN Nishina Center for Accelerator-Based Science, 2-1 Hirosawa, Wako, Saitama351-0198, Japan.
Uesaka T; Cluster for Pioneering Research, RIKEN, RIKEN Nishina Center for Accelerator-Based Science, 2-1 Hirosawa, Wako, Saitama351-0198, Japan.
Yanai N; Department of Chemistry and Biochemistry, Graduate School of Engineering, Center for Molecular Systems (CMS), Kyushu University, 744 Moto-oka, Nishi-ku, Fukuoka819-0395, Japan.

J Phys Chem B ; 127(5): 1219-1228, 2023 Feb 09.

Article en En | MEDLINE | ID: mdl-36717096

RESUMEN

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

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Texto completo: 1 Colección: 01-internacional Base de datos: MEDLINE Idioma: En Revista: J Phys Chem B Asunto de la revista: QUIMICA Año: 2023 Tipo del documento: Article País de afiliación: Japón Pais de publicación: Estados Unidos

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