Photochemically Induced Dynamic Nuclear Polarization of Heteronuclear Singlet Order

Kirill F. Sheberstov, Liubov Chuchkova, Yinan Hu, Ivan V. Zhukov, Alexey S. Kiryutin, Artur V. Eshtukov, Dmitry A. Cheshkov, Danila A. Barskiy, John W. Blanchard, Dmitry Budker, Konstantin L. Ivanov, Alexandra V. Yurkovskaya

Research output: Contribution to journalArticlepeer-review

Abstract

Photochemically induced dynamic nuclear polarization (photo-CIDNP) is a method to hyperpolarize nuclear spins using light. In most cases, CIDNP experiments are performed in high magnetic fields and the sample is irradiated by light inside a nuclear magnetic resonance (NMR) spectrometer. Here we demonstrate photo-CIDNP hyperpolarization generated in the Earth's magnetic field and under zero- to ultralow-field (ZULF) conditions. Irradiating a sample containing tetraphenylporphyrin and para-benzoquinone for several seconds with light-emitting diodes produces strong hyperpolarization of 1H and 13C nuclear spins, enhancing the NMR signals more than 200 times. The hyperpolarized spin states at the Earth's field and in ZULF are different. In the latter case, the state corresponds to the singlet order between scalar-coupled 1H-13C nuclear spins. This state has a longer lifetime than the state hyperpolarized at Earth's field. The method is simple and cost-efficient and should be applicable to many molecular systems known to exhibit photo-CIDNP, including amino acids and nucleotides.

Original languageEnglish
Pages (from-to)4686-4691
Number of pages6
JournalJournal of Physical Chemistry Letters
Volume12
Issue number19
DOIs
Publication statusPublished - 20 May 2021

OECD FOS+WOS

  • 2.05 MATERIALS ENGINEERING
  • 1.04 CHEMICAL SCIENCES
  • 1.04.EI CHEMISTRY, PHYSICAL
  • 2.1.NS NANOSCIENCE & NANOTECHNOLOGY
  • 2.05.PM MATERIALS SCIENCE, MULTIDISCIPLINARY
  • 1.03.UH PHYSICS, ATOMIC, MOLECULAR & CHEMICAL

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