Spin Density Localization And Accessibility Of Organic Radicals Affect Liquid-State Dnp Efficiency

Marcel Levien,Maik Reinhard,Markus Hiller,Igor Tkach,Marina Bennati,Tomas Orlando

PHYSICAL CHEMISTRY CHEMICAL PHYSICS（2021）

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摘要

We report a large variation in liquid DNP performance of up to a factor of about five in coupling factor among organic radicals commonly used as polarizing agents. A comparative study of H-1 and C-13 DNP in model systems shows the impact of the spin density distribution and accessibility of the radical site by the target molecule.

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