Effect of heavy atoms on photochemically induced dynamic nuclear polarization in liquids.

ABSTRACT: Given its short hyperpolarization time (∼10^-6 s) and mostly non-perturbative nature, photo-chemically induced dynamic nuclear polarization (photo-CIDNP) is a powerful tool for sensitivity enhancement in nuclear magnetic resonance. In this study, we explore the extent of ¹H-detected ¹³C nuclear hyperpolarization that can be gained via photo-CIDNP in the presence of small-molecule additives containing a heavy atom. The underlying rationale for this methodology is the well-known external-heavy-atom (EHA) effect, which leads to significant enhancements in the intersystem-crossing rate of selected photosensitizer dyes from photoexcited singlet to triplet. We exploited the EHA effect upon addition of moderate amounts of halogen-atom-containing cosolutes. The resu

SUBMITTER: Okuno Y 

PROVIDER: S-EPMC5767533 | biostudies-literature | 2018 Jan

REPOSITORIES: biostudies-literature