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

The title complex of [Ni2(?-Sal)4(Dena)2]H2O, [(?-tetrakissalicylato-?-O,O)(bis-N,N-diethylnicotinamide-?-N)(binickel(II))]hydrate, C48H52Ni2N4O16, has been synthesized and explained as structure using some elemental analyses. FT-IR spectra, UV-Vis reflectance, magnetic measurements, thermal analysis and x-ray diffraction methods. The 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) A?, b = 10.5238(3) A?, c = 21.8165(9), ? = 90.00°, ? = 126.546(3)°, ? = 90.00° and Z = 2. The compound [Ni2(?-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 ?-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. © 2014 The Chemical Society & Wiley-VCH Verlag GmbH & Co. KGaA.