Magnetostructural correlations in heteroleptic nickel(II) complexes

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• 作者：J. Titiš ; R. Boč ; a ; L’ ; . Dlh&#xe1 ; ň ; T. Ď ; urč ; ekov&#xe1 ; H. Fuess ; R. Ivanikov&#xe1 ; V. Mr&#xe1 ; zov&#xe1 ; B. Pap&#xe1 ; nkov&#xe1 ; ; I. Svoboda
• 关键词：Nickel(II) complexes ; Crystal structure ; N-heterocyclic ligands ; Magneto-structural correlation ; Zero-field splitting
• 刊名：Polyhedron
• 出版年：2007
• 期刊代码：87_02775387
• 类别：ch
• 出版时间：1 May 2007
• 卷：26
• 期：7
• 页码：1523-1530
• 文件大小：857 K

摘要

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(L^NN)₂(H₂O)₂], L^NN – 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.