Proton relaxometry of long-lived spin order

Proton relaxometry of long-lived spin order Full article

Journal

ChemPhysChem
ISSN: 1439-4235

Output data

Year: 2019, Volume: 20, Number: 5, Pages: 766-772 Pages count : 7 DOI: 10.1002/cphc.201800960

Authors

Kiryutin Alexey S ^1,2 , Panov Mikhail S. ^1,2 , Yurkovskaya Alexandra V. ^1,2 , Ivanov Konstantin L ^1,2 , Bodenhausen Geoffrey ³

Affiliations

1	International Tomography Center SB RAS Institutskaya 3 A, Novosibirsk, 630090 (Russia)
2	Novosibirsk State University Pirogova 2, Novosibirsk, 630090 (Russia)
3	Laboratoire des biomolécules, LBM, Département de chimie, École Normale Supérieure PSL University, Sorbonne Université, CNRS 24 rue Lhomond, 75231 Paris cedex 05 (France)

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 T1-relaxation times (18 and 30 s, respectively, at a field urn:x-wiley:14394235:media:cphc201800960:cphc201800960-math-0001 =9.4 T). In protonated solvents the relaxation times become shorter, but the lifetime is still substantially longer than urn:x-wiley:14394235:media:cphc201800960:cphc201800960-math-0002 . 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.

Kiryutin A.S. , Panov M.S. , Yurkovskaya A.V. , Ivanov K.L. , Bodenhausen G.
Proton relaxometry of long-lived spin order
ChemPhysChem. 2019. V.20. N5. P.766-772. DOI: 10.1002/cphc.201800960

Submitted:	Oct 12, 2018
Accepted:	Jan 2, 2019
Published online:	Jan 2, 2019
Published print:	Feb 8, 2019

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