Synthesis and structure of a Ni(II) complex with N ',N '(2)-bis[(1E)-1-(2-quinolyl)methylene]propanedihydrazide: multiple intramolecular CH center dot center dot center dot pi interactions between quinoline and quinolineimine chelate

Abstract

A new malonic dihydrazide-based ligand, N',N'(2)-bis[(1E)-1-(2-quinolyl)methylene]propanedihydrazide (H(2)L3), has been prepared and characterized by elemental analysis, IR, C-13 NMR, and H-1 NMR spectroscopies. In the reaction of H(2)L3 with Ni(II) a binuclear complex has been obtained. The structure of the complex was established by X-ray analysis. Each Ni(II) is coordinated with two NNO donor sets from two ligand molecules in dianionic form (L3(2-)) forming an octahedral geometry. Multiple intramolecular C-H center dot center dot center dot pi (chelate ring) interactions support the molecular geometry of the [Ni-2(L3)(2)] complex. The structure of [Ni-2(L3)(2)] is compared with those of analogous Ni(II) complexes with pyridine dihydrazone type ligands. Magnetic behavior of the dinuclear complex was studied in temperature range of 2-300 K.