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 similar to 13, which is comparable to previous results on the narrow-line-width trityl radical.
High-field dynamic nuclear polarization with high-spin transition metal ions / B.Corzilius; A.ASmith; A.B.Barnes; C.Luchinat; I.Bertini; R.G.Griffin. - In: JOURNAL OF THE AMERICAN CHEMICAL SOCIETY. - ISSN 0002-7863. - STAMPA. - 133(15):(2011), pp. 5648-5651. [10.1021/ja1109002]
High-field dynamic nuclear polarization with high-spin transition metal ions
LUCHINAT, CLAUDIO;BERTINI, IVANO;
2011
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 similar to 13, which is comparable to previous results on the narrow-line-width trityl radical.
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