Summary
The coordinating behaviour of tris(1-pyrazolyl)methane, HCpz3 and 2,2′-bis(1-pyrazolyl)propane, Me2Cpz2 ligands towards nickel(II) salts has been investigated. Tris(1-pyrazolyl)methane yields stable, solid complexes of the type [Ni(HCpz3)X.H2O].nH2O (X=Cl, n=2; AcO, N=1) and [Ni(HCpz3)2]X2 (X = Br, I, NO3, or IO4) whilst Me2Cpz2 ligand does not. However, Me2Cpz2 in the presence of poor coordinating polyanions such as BF −4 and PF −6 reacts readily to give stable complexes of the type [Ni(Me2Cpz2)2X]Y (X=Cl, NO3, or AcO and Y=BF4 or PF6). The complexes have been characterised by elemental analysis, magnetic moments, electronic and infrared absorption spectra. An octahedral structure has been proposed for the complexes [Ni(HCpz3)X2 · H2O] · nH2O with one water molecule occupying an axial position. An octahedral structure has also been proposed for the complex ions, [Ni(HCpz3)2]2+ and [Ni(Me2Cpz2)2X]+(X = NO3 or AcO) with the anion X acting as a bidentate ligand whilst [Ni(Me2Cpz2)2Cl]+ is considered to have a square pyramidal structure.
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Mesubi, M.A., Ekemenzie, P.I. Studies on nickel (II) complexes of some poly(1-pyrazolyl)alkane ligands. Transition Met Chem 9, 91–96 (1984). https://doi.org/10.1007/BF00618583
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DOI: https://doi.org/10.1007/BF00618583