Novel Fe(III), Co(III), Ni(II), Cu(II) coordination compounds involving 2-[(2-hydroxyphenyl)methylene]hydrazine-N-(2-propenyl)-carbothioamide as ligand: Synthesis, crystal structures and spectral characteristics.

Novel Cu(II), Fe(III), Co(III) and Ni(II) coordination compounds with a 2-[(2-hydroxyphenyl)methylene]hydrazine-N-(2-propenyl)carbothioamide have been synthesized and characterized by single crystal X-ray diffraction, IR, UV–Vis, 1 H, ( 13 C) NMR and X-ray photoelectron spectroscopy. The optimal conditions for the complexation reactions have been determined. Depending on synthesis conditions the ligand coordinates to the metal ion as a neutral molecule, monoanion or bianion mode forming complexes with composition [Cu(H 2 L)Cl] ( I ), [Fe(H 2 L) 2 ]NO 3 ( II ), [Co(H 2 L) 2 ]Cl ( III ) and [Ni(HL)Py] ( IV ). The stability constants for the compounds I − III have been calculated. It has been found that the ligand molecules are coordinated in a tridentate manner by the sulfur, azomethine nitrogen and phenol oxygen in both thione (complexes I − III ) or thiolic (complex IV ) tautomeric forms. [ABSTRACT FROM AUTHOR]