7 Citations (Scopus)

Abstract

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 (Formula presented.) =9.4 T). In protonated solvents the relaxation times become shorter, but the lifetime is still substantially longer than (Formula presented.). 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.

Original languageEnglish
Pages (from-to)766-772
Number of pages7
JournalChemPhysChem
Volume20
Issue number5
DOIs
Publication statusPublished - 4 Mar 2019

Keywords

  • field dependence
  • kinetics
  • long-lived states
  • magnetic properties
  • relaxometry
  • SLOW DIFFUSION
  • PARA-HYDROGEN
  • FIELD
  • DIFFUSION-COEFFICIENTS
  • RELAXATION
  • SINGLET-STATES
  • LEVEL ANTI-CROSSINGS
  • NMR
  • MAGNETIC-RESONANCE
  • POLARIZATION

Fingerprint Dive into the research topics of 'Proton Relaxometry of Long-Lived Spin Order'. Together they form a unique fingerprint.

Cite this