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. Author manuscript; available in PMC: 2012 Sep 1.
Published in final edited form as: Solid State Nucl Magn Reson. 2011 Aug 6;40(2):31–41. doi: 10.1016/j.ssnmr.2011.08.001

Figure 1.

Figure 1

Polarizing agents: (1) 4-hydroxy-TEMPO, (2) 4-amino-TEMPO, (3) trityl [154], (4) BDPA [104], (5) BTnE, n=2, 3 or 4 [49*], (6) TOTAPOL [50], (7) DOTOPA-TEMPO [52*], (8) BTOXA [22*], (9) BTOX [22*], (10) BTurea [22*], (11) bTbk [48], (12) BDPA-TEMPO [81], (13) BTcholesterol [99], (14) pyrelene-TEMPO. What is illustrated includes the commonly used radicals for high-field DNP (1–12) and future designer polarizing agents for aligned membranes (13) and photoexcited DNP (14).