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

摘要

A new malonic dihydrazide-based ligand, N',N'~2-bisl(1E)-1-(2-quinolyl)methy-lene]propanedihydrazide (H_2L3), has been prepared and characterized by elemental analysis, IR,~(13)C NMR, and 'H NMR spectroscopies. In the reaction of H_2L3 with Ni(II) a binuclcar 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??? π (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 2-300K