![Sample our Engineering & Technology journals, sign in here to start your access, latest two full volumes FREE to you for 14 days]({"type":"image" , "src" : "/sda/5933/TOC-Subject-Sample-2021-Engineering-Tech.jpg"})
Abstract
Complexes formed by N,N′-dibenzylethylenediamine (DBEn) and nickel(II) salts exemplify a wide range of magnetic behavior and stereochemistry. Ni(DBEn)2Cl2, Ni(DBEn)2SO4·H2O, [Ni(DBEn)2(H2O)2]Br2·H2O, and [Ni(DBEn)2(H2O)2](ClO4)2 or (BF4)2 are tetragonally-distorted octahedral complexes with essentially temperature-independent magnetic moments (μe ≃ 3.1 B.M.); Ni(DBEn)2(NO3)2 contains cis-bidentate and ionic anions; and Ni(DBEn)Cl2 and Ni(DBEn)Br2 have polymeric six-coordinate structures in which weak ferromagnetic interaction occurs. Dehydration of the [Ni(DBEn)2(H2O)2]Br2·H2O gives an apparently five-coordinate compound [Ni(DBEn)2Br]Br; dehydration of the perchlorate gives a variety of products according to the conditions of preparation of the perchlorate and of its dehydration. The products identified are blue Ni(DBEn)2(ClO4)2, which has the spectral and magnetic properties of a tetragonally-distorted octahedral complex, yellow Ni(DBEn)2(ClO4)2 · H2O, which from its magnetic moment (μe ≃ 2.0 B.M., almost independent of temperature) and reflectance spectrum is a mixture of a diamagnetic species and the blue dihydrate; and pink Ni(DBEn)2(ClO4)2 which appears to contain the diamagnetic species and the blue anhydrate in equilibrium as the magnetic moment and reflectance spectrum are temperature-dependent.