ArticleThe journal of physical chemistry letters2026
Optical Hyperpolarization of 1H and 19F Spins in Organic Liquids.
Article in The journal of physical chemistry letters, 2026. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Not yet cited in PubMed.
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Abstract
Optical dynamic nuclear polarization (oDNP) in liquids offers a microwave-free route to NMR signal enhancement but has so far relied on a limited number of dye-radical systems with restricted photostability, typically requiring high-power laser sources and sample flow to mitigate photobleaching of the dye. Here, we investigate porphyrin-BDPA pairs for oDNP in organic solvents using illumination from an incoherent light-emitting diode, providing 1H enhancement factors up to -7.5 at 0.35 T and -25 at 0.16 T in bulk solutions. Beyond 1H hyperpolarization, we show optical enhancement of 19F nuclei in bulk solutions (+5 at 0.37 T), with the positive enhancement indicating a significant scalar contribution to the electron-nuclear interaction. The improved photostability of porphyrins enables one- and two-dimensional oDNP experiments without sample flow, thereby simplifying the experimental implementation of oDNP at low magnetic fields.
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