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

页码：9670 / 9675

页数：6

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