Synthesis and structural characterization of cobalt(II) and zinc(II) complexes with 2-(indazol-1-yl)-2-thiazoline (TnInA). X-ray characterization of [CoCl2(TnInA)2] · C2H6O and [(M)(TnInA)2(H2O)2](NO3)2 (M = Co, Zn)

Several complexes of 2-(indazol-1-yl)-2-thiazoline (TnInA) with the divalent ions Co and Zn have been synthesized by the direct combination of the ligand and the metal chloride or nitrate hydrated salts in ethanol. These complexes have been characterized by a variety of physical–chemical techniques. Moreover, the structures of [CoCl2(TnInA)2] · C2H6O (1) and [(M)(TnInA)2(H2O)2](NO3)2 (M = Co, 3; Zn, 4) were determined by single-crystal X-ray diffraction. In all the complexes, the ligand TnInA bonds to the metal ion through the indazole and thiazoline nitrogen atoms. In complex 1 the environment around the cobalt ion may be described as a distorted octahedron with two TnInA ligands and two chlorine ligands. Compounds 3 and 4 are isostructural with a distorted octahedral geometry around the metal center, being linked to two water molecules and two TnInA ligands. However, in complex [ZnCl2(TnInA)] (2) the zinc atom is four-coordinated with a probable tetrahedral environment with two chloro ligands and one TnInA ligand bonded to the metal ion.

Graphical abstractSynthesis and characterization by physical measurements of cobalt(II) and zinc(II) complexes with a thiazoline/indazole derivative ligand. The X-ray crystal structures of [CoCl2(TnInA)2] · C2H6O, [Co(TnInA)2(H2O)2](NO3)2 and [Zn(TnInA)2(H2O)2](NO3)2 have also been determined. These complexes present a distorted octahedral geometry around the metal(II) ion.Figure optionsDownload full-size imageDownload as PowerPoint slide