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Models S4 (A) and S5 (B). (A) Model S4 (fluorine, oxygen, and nitrogen atoms in green, red, and blue, respectively). H-bond lengths and the 19F-centroid (Y356•, yellow sphere) distances are indicated. (B) Model S5 (cyan sticks, colors as in panel A). (C and D) Top view of the models shown in panels (A) and (B). In panels (C) and (D), the g tensor of Y356• is indicated along with the parallel component of the dipolar HFC tensor of the distal 19F nucleus Fb.
