Synthesis, characterization and X-ray crystal structures of trinuclear zinc(II) and cadmium(II) complexes derived from an oxovanadium(IV) complex ligand

• Two trinuclear complexes were synthesized based on an oxovanadium complex ligand VOL.
• The crystal structures and spectroscopic properties were investigated.
• Complex 1 exhibits antiferromagnetic interactions between the paramagnetic ions.

By using a macrocyclic oxovanadium(IV) complex ligand VOL (H2L = 2,3-dioxo-5,6:13,14-dibenzo-7,12-diphenyl-1,4,8,11-tetraazacyclo-tetradeca-7,12-diene) as precursor, two new trinuclear complexes [(VOL)2Zn(CH3OH)2](ClO4)2·5CH3OH (1) and [(VOL)2Cd(CH3OH)2](ClO4)2·3CH3OH·1.82H2O (2) have been synthesized. Their structures were determined by single-crystal X-ray diffraction and further characterized by elemental analyses, FT-IR, UV–Vis spectroscopy, powder X-ray diffraction (PXRD), and thermogravimetric analyses (TGA). In the two complexes, the central zinc(II) and cadmium(II) ions are connected with two VOL fragments via exo-cis oxamido bridge. Magnetic susceptibility studies (2–300 K) of complex 1 indicate the occurrence of weak antiferromagnetic coupling between the paramagnetic metals. The experimental data have been fitted according to Heisenberg Hamiltonian Ĥ=-2JŜ1Ŝ2, leading to J = −0.31 cm−1, g = 2.01.

By using a macrocyclic oxovanadium(IV) complex ligand VOL (H2L = 2,3-dioxo-5,6:13,14-dibenzo-7,12-diphenyl-1,4,8,11-tetraazacyclo-tetradeca-7,12-diene) as precursor, two new trinuclear complexes [(VOL)2Zn(CH3OH)2](ClO4)2·5CH3OH (1) and [(VOL)2Cd(CH3OH)2](ClO4)2·3CH3OH·1.82H2O (2) have been synthesized and structurally characterized by X-ray crystallography. Magnetic susceptibility studies indicate the occurrence of weak antiferromagnetic coupling between the paramagnetic metals in complex 1.Figure optionsDownload as PowerPoint slide