Three novel trinuclear zinc(II)/nickel(II) complexes with pentadentate ligands N-nitrobenzoylsalicylhydrazidate

Three trinuclear zinc(II)/nickel(II) complexes with two pentadentate ligands, N-p-nitrobenzoylsalicylhydrazidate (H3-p-nbzshz) and N-o-nitrobenzoylsalicylhydrazidate (H3-o-nbzshz) have been synthesized and characterized by X-ray crystallography. The complex [Zn3(p-nbzshz)2(C5H5N)4]n (1) molecule exhibits a one-dimensional wave-like chain structure resulting from the linkage of phenolate oxygen donor atoms of the ligands between neighboring motifs. The two nickel(II) complexes, Ni3(p-nbzshz)2(C5H5N)4 (2) and Ni3(o-nbzshz)2(C3H7NO)2(C2H6O)2 (3) are trinuclear complexes in which three nickel(II) centers exhibit alternating square-planar and octahedral geometries. Complex 2 exhibits a curved Ni3 metal arrangement with a Ni(1)–Ni(2)–Ni(3) angle of 62.36°, while the three nickel atoms in complex 3 are strictly linear with an angle of 180°.

Three novel trinuclear complexes Zn3(p-nbzshz)2(C5H5N)4 (1), Ni3(p-nbzshz)2(py)4 (2) and Ni3(o-nbshz)2(DMF)2((CH3)2O)2 (3) have been obtained by the reaction of Zn(OAc)2 · 4H2O or Ni(OAc)2 · H2O with two new ligands, N-p-nitrobenzoylsalicylhydrazidate and N-o-nitrobenzoylsalicylhydrazidate. Complex 1 exhibits a one-dimensional wave-like chain structure resulting from the linkage of the phenolate oxygen donor atoms of the ligand between adjacent trinuclear zinc units. Complex 2 is an uncommon bent trinuclear nickel complex, whilst the three nickel atoms in complex 3 are arranged in a strictly linear fashion.Figure optionsDownload as PowerPoint slide