Syntheses, structures and magnetic properties of two new water bridged dinuclear nickel(II) complexes containing derivatives of 1,2,4-triazole and pivalate ligands

Two new water bridged dinuclear nickel(II) complexes containing derivatives of 1,2,4-triazole and pivalate ligands, [Ni2(μ-H2O)(μ-admtrz)2(piv)4(H2O)2] · 13H2O (1 · 13H2O) (admtrz = 4-amino-3,5-dimethyl-1,2,4-triazole, piv = pivalate anion) and [Ni2(μ-H2O)(μ-adetrz)2(piv)4] · 3H2O (2 · 3H2O) (adetrz = 4-amino-3,5-diethyl-1,2,4-triazole) were prepared and structurally characterized. Both 1 and 2 have similar unprecedented dinuclear Ni(II) units with one water and two triazole bridges, in which each six-coordinated Ni(II) ion is further coordinated with terminal pivalate ligand and in the case of 1 also two terminal water molecules. Variable temperature magnetic susceptibility measurements for the powder samples of 1 and 2 in the range of 1.8–300 K show that weak antiferromagnetic interactions occur in 1 and 2. Theoretical fit of the magnetic data gave g = 2.198, D = −10.03 cm−1, and J = −6.88 cm−1 for 1 and g = 2.143, D = −12.31 cm−1, and J = −5.63 cm−1 for 2.

Two new water bridged dinuclear nickel(II) complexes 1 · 13H2O and 2 · 3H2O containing derivatives of 1,2,4-trizaole and pivalate ligands have been synthesized and structurally characterized. Magnetic susceptibility measurements on the powder samples of 1 and 2 at 1.8–300 K revealed that the overall weak antiferromagnetic coupling occur among nickel(II) ions.Figure optionsDownload as PowerPoint slide