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- [43] The Ancestry of the Long-LivedAMERICAN ANTHROPOLOGIST, 1934, 36 (04) : 615 - 618Danforth, C. H.
Proton Relaxometry of Long-Lived Spin Order
被引：13
|作者：
Kiryutin, Alexey S.
[1
,2
]
Panov, Mikhail S.
[1
,2
]
Yurkovskaya, Alexandra, V
[1
,2
]
Ivanov, Konstantin L.
[1
,2
]
Bodenhausen, Geoffrey
[3
]
机构：
[1] Int Tomog Ctr SB RAS, Inst Skaya 3, Novosibirsk 630090, Russia
[2] Novosibirsk State Univ, Pirogova 2, Novosibirsk 630090, Russia
[3] PSL Univ, Ecole Normale Super, Dept Chim, Lab Biomol,LBM,Sorbonne Univ,CNRS, 24 Rue Lhomond, F-75231 Paris 05, France
基金：
俄罗斯科学基金会;
关键词：
field dependence;
kinetics;
long-lived states;
magnetic properties;
relaxometry;
LEVEL ANTI-CROSSINGS;
MAGNETIC-RESONANCE;
PARA-HYDROGEN;
DIFFUSION-COEFFICIENTS;
SINGLET-STATES;
SLOW DIFFUSION;
FIELD;
NMR;
RELAXATION;
POLARIZATION;
D O I：
10.1002/cphc.201800960
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：
A study of long-lived spin order in chlorothiophene carboxylates at both high and low magnetic fields is presented. Careful sample preparation (removal of dissolved oxygen in solution, chelating of paramagnetic impurities, reduction of convection) allows one to obtain very long-lived singlet order of the two coupled protons in chlorothiophene derivatives, having lifetimes of about 130 s in D2O and 240 s in deuterated methanol, which are much longer than the T-1-relaxation times (18 and 30 s, respectively, at a field B0=9.4 T). In protonated solvents the relaxation times become shorter, but the lifetime is still substantially longer than T1. In addition, long-lived coherences are shown to have lifetimes as long as 30 s. Thiophene derivatives can be used as molecular tags to study slow transport, slow dynamics and slow chemical processes, as has been shown in recent years.
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页码：766 / 772
页数：7
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