Heterogeneous Overhauser-DNP on 1 H dominated by scalar coupling in aqueous solution.

The Overhauser Dynamic Nuclear Polarization (O-DNP) of 1 H nuclei usually involves a dipolar coupling with the polarizing agent, whereas scalar coupling via hyperfine interactions are more common with 13 C nuclei. Here, we show a scalar-coupling dominated 1 H O-DNP, using polyaniline as a heterogeneous polarizing agent in an aqueous solution.