利用光激发三线态电子实现金属有机框架的动态核极化
Dynamic Nuclear Polarization of Metal-Organic Frameworks Using Photoexcited Triplet Electrons.
作者信息
Fujiwara Saiya, Hosoyamada Masanori, Tateishi Kenichiro, Uesaka Tomohiro, Ideta Keiko, Kimizuka Nobuo, Yanai Nobuhiro
机构信息
Department of Chemistry and Biochemistry, Graduate School of Engineering, Center for Molecular Systems (CMS) , Kyushu University , 744 Moto-oka , Nishi-ku, Fukuoka 819-0395 , Japan.
Cluster for Pioneering Research , RIKEN , 2-1 Hirosawa , Wako , Saitama 351-0198 , Japan.
出版信息
J Am Chem Soc. 2018 Nov 21;140(46):15606-15610. doi: 10.1021/jacs.8b10121. Epub 2018 Nov 7.
While dynamic nuclear polarization based on photoexcited triplet electrons (triplet-DNP) has the potential to hyperpolarize nuclear spins of target substrates in the low magnetic field at room temperature, there has been no triplet-DNP system offering structural rigidity and substrate accessibility. Here, we report the first example of triplet-DNP of nanoporous metal-organic frameworks. Accommodation of a carboxylate-modified pentacene derivative in a partially deuterated ZIF-8 (D-ZIF-8) results in a clear H NMR signal enhancement over thermal equilibrium.
基于光激发三重态电子的动态核极化（三重态-DNP）有潜力在室温下的低磁场中使目标底物的核自旋超极化，但一直没有提供结构刚性和底物可及性的三重态-DNP系统。在此，我们报道了纳米多孔金属有机框架的三重态-DNP的首个实例。在部分氘代的ZIF-8（D-ZIF-8）中容纳羧酸盐修饰的并五苯衍生物，导致相对于热平衡有明显的氢核磁共振信号增强。
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