High-field dynamic nuclear polarization with high-spin transition metal ions.

ABSTRACT: We report the dynamic nuclear polarization of (1)H spins in magic-angle-spinning spectra recorded at 5 T and 84 K via the solid effect using Mn(2+) and Gd(3+) complexes as polarizing agents. We show that the magnitude of the enhancements can be directly related to the effective line width of the central (m(S) = -1/2 ? +1/2) EPR transition. Using a Gd(3+) complex with a narrow central transition EPR line width of 29 MHz, we observed a maximum enhancement of ?13, which is comparable to previous results on the narrow-line-width trityl radical.

SUBMITTER: Corzilius B 

PROVIDER: S-EPMC3086350 | biostudies-other | 2011 Apr

REPOSITORIES: biostudies-other