Proton Relaxometry of Long-Lived Spin Order
| Autor: | Konstantin L. Ivanov, Alexey S. Kiryutin, Alexandra V. Yurkovskaya, Geoffrey Bodenhausen, Mikhail S. Panov |
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| Rok vydání: | 2019 |
| Předmět: |
Relaxometry
Materials science Proton Kinetics Relaxation (NMR) Protonation 02 engineering and technology 010402 general chemistry 021001 nanoscience & nanotechnology 01 natural sciences Atomic and Molecular Physics and Optics 0104 chemical sciences chemistry.chemical_compound chemistry Chemical physics Deuterated methanol Singlet state Physical and Theoretical Chemistry 0210 nano-technology Spin-½ |
| Zdroj: | ChemPhysChem. 20:766-772 |
| ISSN: | 1439-4235 |
| DOI: | 10.1002/cphc.201800960 |
| Popis: | 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 D2 O and 240 s in deuterated methanol, which are much longer than the T1 -relaxation times (18 and 30 s, respectively, at a field B 0 =9.4 T). In protonated solvents the relaxation times become shorter, but the lifetime is still substantially longer than T 1 . 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. |
| Databáze: | OpenAIRE |
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