Abstract
We show that optical excitation of radical triplet pair systems can produce a fourfold NMR signal enhancement in solution, without the need for microwave pumping. Development of optical hyperpolarization methods will significantly impact all NMR user groups by boosting sensitivity and reducing signal averaging times.
Highlights
We show that optical excitation of radical triplet pair systems can produce a fourfold Nuclear magnetic resonance (NMR) signal enhancement in solution, without the need for microwave pumping
The previously reported phenomenon known as photochemically induced dynamic nuclear polarization is based on the related radical pair mechanism,[17,18] and typically achieves enhancements only of certain solvent-exposed aromatic amino acids participating in electron transfer reactions, so is applicable only in special cases.[2,19,20]
While previous work has sought to exploit radical–triplet pair mechanism (RTPM) electron spin-polarization directly in electron paramagnetic resonance (EPR),[21,22] or in construction of an optically pumped maser,[23] here we demonstrate its use to boost sensitivity in solution-state NMR
Summary
We show that optical excitation of radical triplet pair systems can produce a fourfold NMR signal enhancement in solution, without the need for microwave pumping.
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