Dynamic Nuclear Polarization using Photoexcited Triplet Electron Spins in Eutectic Mixtures

被引：14
|
作者：
Kagawa, Akinori [1 ,2 ,3 ]
Negoro, Makoto [1 ,2 ,3 ]
Ohba, Ryohei [1 ]
Ichijo, Naoki [1 ]
Takamine, Kota [1 ]
Nakamura, Yushi [4 ]
Murata, Tsuyoshi [4 ]
Morita, Yasushi [4 ]
Kitagawa, Masahiro [1 ,2 ]
机构：
[1] Osaka Univ, Grad Sch Engn Sci, Toyonaka, Osaka 5608531, Japan
[2] Osaka Univ, Inst Open & Transdisciplinary Res Initiat, Quantum Informat & Quantum Biol Div, Toyonaka, Osaka 5608531, Japan
[3] Japan Sci & Technol Agcy JST, PRESTO, Kawaguchi, Saitama 3320012, Japan
[4] Aichi Inst Technol, Fac Engn, Toyota, Aichi 4700392, Japan
来源：
JOURNAL OF PHYSICAL CHEMISTRY A | 2018年 / 122卷 / 50期
关键词：
CROSS-POLARIZATION; NMR-SPECTROSCOPY; HYPERPOLARIZATION; PENTACENE; STATE;
D O I：
10.1021/acs.jpca.8b09934
中图分类号：
O64 [物理化学（理论化学）、化学物理学];
学科分类号：
070304 ; 081704 ;
摘要：
Dynamic nuclear polarization using photoexcited triplet electrons (Triplet-DNP) is a method to significantly enhance nuclear spin polarization even in a low magnetic field and at room temperature. Pentacene has been practically used as an efficient polarizing agent for Triplet-DNP. In this study, we demonstrate room temperature H-1 and C-13 hyperpolarization of eutectic mixtures of deuterated benzoic acid doped with pentacene and a target molecule such as salicylic acid, nicotinic acid, or 2-naphthoic acid. These molecules are otherwise difficult to hyperpolarize by Triplet-DNP due to the low pentacene dopabilities of these molecules. The highest H-1 polarization of 1.2% has been obtained for the eutectic mixture of salicylic acid in 0.39 T. The present sample preparation is a crucial method to widen the range of applications of Triplet-DNP to chemical and biomedical analyses.
引用
收藏
页码：9670 / 9675
页数：6
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