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(a) Molecular structures of the trityl radicals determined by single-crystal X-ray diffraction; thermal ellipsoids are shown at 50% probability (one of the CF3 groups is disordered). Cl and F, green; O, red; C, gray; H, white. (b) Side-on view of radical stacking in [Cl]• (left) and [Ph]• (right) structures showing possible intermolecular interactions. The purple ball in the structure for [Ph]• represents the ring centroid.
