摘要:
Nickel(II) complexes of the formula [Ni(L-n)(4)(NCS)(2)], (where L-n are derivatives of furo[3,2-c]pyridine, L-1 = furo[3,2-c]pyridine, L-2 = 2-methylfuro[3,2-c]pyridine, L-3 = 2,3-dimethylfuro[3,2-c]pyridine and L-4 = benzo[4,5]furo[3,2-c]pyridine) have been prepared and characterized by spectroscopic methods and magnetic measurements. For comparative reasons, L-5 = isoquinoline has also been involved. The crystal and molecular structures of [Ni(L-2)(4)(NCS)(2)], [Ni(L-4)(4)(NCS)(2)] and [Ni(L-5)(4)(NCS)(2)] have been determined by X-ray diffractions methods. The structures of all the complexes are formed by isolated molecules. The Ni(II) ions are six-coordinate, the equatorial planes are formed by four N-donor furopyridines whereas the isothiocyanate groups coordinate in the axial positions. The magnetism of the complexes exhibits a zero-field splitting, the magnitude of which correlates with the distortion degree of the coordination polyhedra. (c) 2005 Elsevier Ltd. All rights reserved.