The sample’s low temperature was maintained by keeping it in the cold nitrogen stream, using Oxford Cryosystems cooling devices.
The structure was solved by direct methods using SXELXS [42 (link)] and refined by the full-matrix least squares procedure with SHELXL [40 (link)] within an OLEX2 [43 (link)] graphical interface. Figures were produced with Mercury_3.10 [44 (link)] software.
All H atoms were visible in the residual density map, but were added geometrically and refined mostly in riding approximation.
Detailed information about the data processing, structure solution, and refinement is presented in