Magnetostructural correlations in heteroleptic nickel(II) complexes |
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| Authors: | J Titiš R Bo?a L’ Dlháň T ?ur?eková H Fuess R Ivaniková V Mrázová B Papánková I Svoboda |
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| Institution: | 1. Department of Chemistry, University of Ss. Cyril and Methodius, Trnava, Slovakia;2. Institute of Inorganic Chemistry, Technology and Materials, Slovak Technical University, SK-812 37 Bratislava, Slovakia;3. Material Science, Darmstadt University of Technology, D-64287 Darmstadt, Germany |
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| Abstract: | 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. |
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| Keywords: | Nickel(II) complexes Crystal structure N-heterocyclic ligands Magneto-structural correlation Zero-field splitting |
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