Fig. 3: Crystal structures of the dimers and monomers considered in this study.

Complementary views of the molecular structures of D (a), MD1 (b), and MD2 (c) and molecular structures of FHPO2 (d, top) and FHPMOCl (d, bottom). Pentafluorophenyl substituents, solvents, and the hydrogen atoms attached to the carbon atoms are omitted for clarity. The dotted lines represent intramolecular hydrogen bonds inferred on the basis of the metric parameters. N, O, and Cl atoms are denoted with balls of blue, red, and green colors, respectively. C and H atoms (linked to N atoms) are denoted with black balls, with smaller balls used for the latter.