Synthesis of a Novel Unexpected Cu(II)-Thiazolidine Complex-X-ray Structure, Hirshfeld Surface Analysis, and Biological Studies.

An unexpected trinuclear Cu(II)-thiazolidine complex has been synthesized by mixing CuCl·2HO with the Schiff base ligand, 1-(((4,5-dihydrothiazol-2-yl)ethylidene)hydrazono)methyl)phenol , in ethanol. Unexpectedly, the reaction proceeded via the hydrolysis of the Schiff base , followed by cyclization to afford 3-methyl-5,6-dihydrothiazolo[3,2-][1,2,3]triazole (), then complexation with the Cu(II) salt, forming the trinuclear complex. The complex was characterized by means of FTIR spectra, elemental analysis, and X-ray crystallography.