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. Author manuscript; available in PMC: 2014 Feb 27.
Published in final edited form as: J Am Chem Soc. 2013 Feb 13;135(8):2935–2938. doi: 10.1021/ja312265x

Table 1.

13C direct detection enhancement ε, electron spin relaxation time T1S and DNP build-up time TB.

Radical ε T1S (ms) TB (s)
SA-BDPA (40 mM) 300 28.9 287 (16)
trityl (40 mM) 480 1.4 167 (7)
Mixture (20 mM of each) 620 3.6 (SA-BPDA) 1.4 (trityl) 216 (3)