The Synthesis, Structure, and Magnetic Properties of Nickel (II) 6-Coordinate Species with Several Substituted Aniline Ligands

Abstract A family of Ni(II) halide complexes of substituted aniline derivatives were prepared and studied via single-crystal X-ray diffraction and variable temperature magnetic measurements: [Ni(4-Mean)4Cl2] 1, [Ni(4-Clan)2Cl2(MeOH)2] 2, [Ni(4-Clan)2Br2(EtOH)2] 3, [Ni(4-Clan)4Br2] (4-Clan) 4, [Ni(4-Clan)2Br2(H2O)2] 5, [Ni(4-MeOan)2Br2(H2O)2] 6, [Ni(3-MeOan)4Cl2] 7, [Ni(3-MeOan)4Br2] 8, [Ni(4-MeOan)4Cl2] 9, [Ni(4-MeOan)4(H2O)2](Br)2 10, and [(4-MeOan)2(DMSO)4Ni](Br)2 11 (4-Mean = 4-methylaniline, 4-Clan = 4-chloroaniline, 3-MeOan = 3-methoxyaniline, 4-MeOan = 4-methoxyaniline). All complexes are six-coordinate, filling the coordination sphere with a combination of halide ions, aniline-based ligands and/or solvent molecules. The complexes demonstrate variable stability once removed from the mother liquor with loss of coordinated solvent molecules being common. Analysis of the magnetic properties of the compounds shows the presence of single-ion anisotropy, weak interactions, or a combination thereof.