Crystal structure of 2-oxo-2H-chromen-7-yl tri-fluoro-methane-sulfonate.

Crystalline 2-oxo-2H-chromen-7-yl tri-fluoro-methane-sulfonate, C10H5F3O5S, forms in the monoclinic space group C2/c as pseudoplanar dyads about an inversion center, with close packing assisted by inter-molecular C-H⋯O contacts of 2.38 Å. These dyads are arranged into a staircase pattern where the direction and pitch of the staircase are aligned with the b axis. Between adjacent stacks, mol-ecules are related by a 21 axis and held in place by a herringbone-like network of additional inter-molecular C-H⋯O contacts of 2.35 Å.