Magnetostructural correlations in heteroleptic nickel(II) complexes

Heteroleptic nickel(II) complexes with the general formula Ni(L)m(H2O)n(X)k, have been synthesized and structurally characterized; L stands for neutral N-donor ligands: 4-benzofuropyridine (bzfupy), dimethylfuropyridine (Me2fupy) and 1,2-dimethylimidazole (Me2iz), X = acetate or Cl−. The structures of the complexes [Ni(bzfupy)2(ac)2(H2O)2], [Ni(Me2fupy)2(H2O)4](ac)2 and [Ni(Me2iz)4(H2O)2]Cl2 · 3H2O are formed from {NiO2O′2N2}, {NiO4N2} and {NiN4O2} chromophores, respectively. These complexes and two other previously characterized complexes, [Ni(pz)4(ac)2], pz – pyrazole, and [Ni(LNN)2(H2O)2], LNN – bidentate chelating ligand, were subjected to magnetochemical investigation down to 2 K (susceptibility and magnetization measurements). They show magnetic behaviour typical for zero-field splitting systems. The axial parameter of the zero-field splitting, D, adopts either positive or negative values and correlates with the axial distortion of the coordination polyhedra.

Heteroleptic nickel(II) complexes with the general formula Ni(L)m(H2O)n(X)k have been synthesized and structurally characterized; L stands for neutral N-donor ligands. The structures of the complexes [Ni(bzfupy)2(ac)2(H2O)2], [Ni(Me2fupy)2(H2O)4](ac)2 and [Ni(Me2iz)4(H2O)2]Cl2 · 3H2O are formed from {NiO2O′2N2}, {NiO4N2} and {NiN4O2} chromophores, respectively. These complexes and two other previously characterized complexes were subjected to magnetochemical investigation down to 2 K (susceptibility and magnetization measurements). They show magnetic behaviour typical for zero-field splitting systems. The axial parameter of the zero-field splitting, D, adopts either positive or negative values and correlates with the axial distortion of the coordination polyhedra.Figure optionsDownload as PowerPoint slide