Uncommon crystallization pattern of a ZnII–sulfathiazole complex: Synthesis, X-ray structural features and TGA calculations of [{Zn(STZ)2(HSTZ)(H2O)}{Zn(STZ)2(H2O)2}3] · 12H2O (STZ = sulfathiazolato anion; sulfathiazole = N1-2-thiazolyl-sulfanilamide)

Sulfathiazole reacts in methanol with Zn(CH3COO)2 · 2H2O at 65 °C to give [{Zn(STZ)2(HSTZ)(H2O)}{Zn(STZ)2(H2O)2}3] · 12H2O. The asymmetrical unit of the new compound is assembled by four single partial complexes with a different number of ligand molecules. The deprotonated sulfonamidic nitrogen atoms of the STZ ligands do not participate in the coordination processes, and in the course of the reaction/recrystallization a noteworthy aggregation of water molecules to the end product arises. TGA experiments allow us to consider that the peculiar structure of the title compound can be related to a cluster “come down”, also because of uncontrolled absorption of water.

Graphical abstractSulfathiazole reacts with Zn(CH3COO)2 · 2H2O giving [{Zn(STZ)2(HSTZ)(H2O)}{Zn(STZ)2(H2O)2}3] · 12H2O. Four single partial complexes with a different number of ligand molecules assemble the asymmetrical unit of the new compound. TGA experiments allow to considering that the structure of the title compound can be related to a cluster dismounting due to excessive absorption of water.Figure optionsDownload full-size imageDownload as PowerPoint slide