Synthesis and Structural Characterization of a Binuclear Mixed‐Ligand (Salicylate and N,N‐diethylnicotinamide) Nickel(II) Complex, Its Magnetic Properties. [Ni2(µ‐Sal)4(Dena)2]H2O

Abstract

AbstractThe title complex of [Ni2(µ‐Sal)4(Dena)2]H2O, [(µ‐tetrakissalicylato‐κ‐O,O)(bis‐N,N‐diethylnicotinamide‐κ‐N)(binickel(II))]hydrate, C48H52Ni2N4O16, has been synthesized and explained as structural using some elemental analysis, FT‐IR spectra, UV‐Vis reflectance, magnetic measurements, thermal analysis and x‐ray diffraction methods. The analysis results showed that the unit cell of complex includes two molecules NiII cation, four molecules salicylates as bridge and two molecules N,N‐diethylnicotinamide ligands, also there is one molecule hydrated aqua. The compound crystallizes in the monoclinic space group P21/c with the following unit‐cell parameters: a=13.6776(6) Å, b=10.5238(3) Å, c=21.8165(9), α=90.00°, β=126.546(3)°, γ=90.00º and Z=2. The compound [Ni2(µ‐Sal)4(Dena)2]H2O is a typical paddle‐wheel complex structure. Two NiII ions are bridged by four salicylate ligands (O2, O2i, O3, O3i, O5, O5i, O6 and O6i) using a µ‐COO− coordination mode [symmetry code: (i) 1‐x, 1‐y, 1‐z]. Each NiII also coordinates to one nitrogen atom (N1 and N1i) from one N,N‐diethylnicotinamide ligand molecule in the axial position. The complex has strong paramagnetic properties.