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A Factor Two Improvement in High-Field Dynamic Nuclear Polarization from Gd(III) Complexes by Design

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journal contribution
posted on 22.05.2019, 00:00 by Gabriele Stevanato, Dominik Józef Kubicki, Georges Menzildjian, Anne-Sophie Chauvin, Katharina Keller, Maxim Yulikov, Gunnar Jeschke, Marinella Mazzanti, Lyndon Emsley
Gadolinium­(III) complexes have recently been demonstrated to have potential as polarizing agents for high-field dynamic nuclear polarization (DNP) NMR spectroscopy. By tailoring the ligand design to reduce the zero-field splitting (ZFS), we demonstrate a quadratic improvement in DNP through the investigation of a stable, water-soluble, narrow-line Gd­(III) complex, [Gd­(tpatcn)], doubling the magic-angle-spinning DNP enhancement of the previous state-of-the-art [Gd­(dota)­(H2O)] at 9.4 T and 100 K.