The routine method for the crystal structure determination is still single-crystal X-ray analysis which require the single crystal sample with appropriate size and quality. However, there are many solids in which no suitable single crystals can be grown and only prepared as microcrystalline powders. In this regard, structure determination from powder diffraction data (SDPD) as a more challenging and more time consuming method than single crystal analysis, is widely and successfully used for organic and inorganic compounds.1,2 Today, the reliability of structures which are carefully determined by SDPD is closely as high as from single-crystal analysis.3 In this study, I describe the SDPD method for crystal structure determination, and demonstrate its use to determine the crystal structures of our new synthesized carboxamide ligand as organic and mercury (II) halide complexes as inorganic compounds. The X-ray powder diffraction patterns of aforementioned compounds were recorded using a laboratory powder X-ray diffractometer. The structure solution has been performed by using a real space method with subsequent Rietveld refinement.

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