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

The title complex of [Ni 2 (µ‐Sal) 4 (Dena) 2 ]H 2 O, [( µ‐tetrakissalicylato‐κ‐O,O)(bis‐N,N‐diethylnicotinamide‐κ‐N)(binickel(II))]hydrate, C 48 H 52 Ni 2 N 4 O 16 , 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 Ni II 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 P2 1 /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 [Ni 2 (µ‐Sal) 4 (Dena) 2 ]H 2 O is a typical paddle‐wheel complex structure. Two Ni II ions are bridged by four salicylate ligands (O2, O2 i , O3, O3 i , O5, O5 i , O6 and O6 i ) using a µ‐COO − coordination mode [symmetry code: (i) 1‐x, 1‐y, 1‐z]. Each Ni II also coordinates to one nitrogen atom (N1 and N1 i ) from one N,N‐diethylnicotinamide ligand molecule in the axial position. The complex has strong paramagnetic properties.