*2.7. Single Crystal X-ray Di*ff*raction (SCXRD)*

X-ray diffraction data were collected using a Rigaku Oxford Diffraction SuperNova diffractometer (Oxford, UK) equipped with a monochromator mirror for Cu Kα (λ = 1.54184 Å) radiation at 150 K. Data reduction was carried out using the CrysAlisPro software, and absorption correction was implemented in the SCALE3 ABSPACK scaling algorithm. The structure was solved (direct methods) and refined (using least squares minimization) with Olex2 [26] using SHELX [27] structure solution programs. All the non-H atoms were refined anisotropically. In addition, all the figures, including the packing and molecular structure diagrams, were drawn using Olex2 and PLATON [28]. Table 1 gives the pertinent crystal lographic data, and Table 2 gives the hydrogen-bond parameters.


**Table 1.** Crystallographic Data for Compounds **1–4**.



**Table 2.** *Cont.*
