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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 6.

Figure 6

Line shape fitting of the EPR spectra (simulations in solid lines and experimental data in dots) of BTOXA measured with 9 and 140 GHz microwave frequency. The multi-frequency spectra were simultaneously fitted with a set of spectral parameters that helped constrain the underlying biradical conformations. For example, possible molecular structures of BTOXA refined from the fitting are shown in the inset. A planar BTOXA molecule yields close EPR frequencies of the tethered nitroxides, regardless of the molecular orientation and thus impedes the efficiency of CE. Figures are reprinted from [22*].