Two polymeric linear tri-nickel(II) complexes: [Ni3(μ3-dpa)4(C4O 4Me)]n(BF4)n and [Ni3(μ3-dpa)4(N3)] n(PF6)n synthesis, structural characterization and magnetic properties
Journal
Journal of the Chinese Chemical Society
Journal Volume
48
Pages
987-996
Date Issued
2001
Author(s)
Abstract
Two new linear tri-nickel(II) complexes with an infinite polymeric chain, [Ni3(μ3-dpa)4(C4O 4Me)](BF4) 1 and [Ni3(μ3-dpa)4(N3)](PF 6) 2, [dpa- = di(α-pyridyl)amido anion], have been synthesized and their structures were determined by X-ray diffraction. Compound 1 crystallizes in the monoclinic system, space group C 2/c, with a = 19.9078(3), b = 13.2986(2), c = 37.6622(5) Å, β= 94.091(1)°, Z = 8. Compound 2 crystallizes in the monoclinic system, space group P 21/n, with a = 13.323(4), b = 23.217(3), c = 17.528(5) Å, β= 94.42(3)°, Z = 4. The two complexes are described as one-dimensional systems with the (C4O4Me)-, 1, or N3-, 2, serving as a μ-(1,3) bridged ligand at the two axial sites of each [Ni3(μ3-dpa)4]2+ fragment. The Ni-Ni distances of 2.400(1) and 2.402(1) in 1 and 2.389(2), 2.385(2) in 2 are obviously shorter than those of 2.4325(7), 2.4356(7) in the monomeric complex [Ni3(μ3-dpa)4(N3)2] 3. The magnetic properties of complexes 2 and 3 were studied by susceptibility measurements vs temperature. The XM vs T plots of both complexes show a strong antiferromagnetic behavior. The simulated J13 values are -95 cm-1 and -97 cm-1 for 2 and 3, respectively.
Subjects
Anti-ferromagnetic interaction;Metal-metal interaction;Polymeric trinickel complex
Type
journal article