Dinuclear Nickel(II) Pivalate with Μ-Aqua and Di-Μ-Pivalato Bridges Showing a Ferromagnetic Interaction

Abstract

Abstract. Dinuclear nickel(II) complex, [Ni 2 {O 2 CC(CH 3 ) 3 } 4 (OH 2 ){HO 2 CC(CH 3 ) 3 } 4 ] (1), was synthesized and characterized by elemental analysis, IR and UV-Vis-NIR spectroscopy, and temperature dependence of magnetic susceptibilities (4.5-300 K). Single-crystal X-ray crystallography revealed a dinuclear core with μ-aqua and di-μ-pivalato bridges having monodentate pivalato and monodentate pivalic acid molecules. Magnetic data analysis showed a ferromagnetic interactions between the two nickel atoms with g = 2.251, J = 2.78 cm , and tip = 176 x 10 -6 cm 3 mol -1.

Di-μ-phenolato-μ-aqua-bridged Dinuclear Nickel(II) Complex with <i>N,N</i>′-Disalicylidene-2,2′-(ethylenedioxy)bis(ethylamine)

“…A similar μ-aqua-bridged dinuclear core was found in dinuclear nickel(II) pivalate, [Ni2{(CH3)3CCO2}4(μ-H2O){(CH3)3CCO2H}4]. 7 The electronic spectrum in DMSO is shown in Fig. 4.…”

“…Previously, we reported on dinuclear nickel(II) complexes with organic ligands having donor atoms as bridging groups, which have the low-spin or high-spin nickel(II) state, resulting in a diamagnetic or paramagnetic property, respectively, depending on the donor atoms. [1][2][3][4][5][6][7] In this study, we synthesized a new nickel(II) complex with N,N′-disalicylidene-2,2′-(ethylenedioxy)bis(ethylamine) (H2dee), and determined the crystal structure of the isolated complex, which shows a unique dinuclear core with twophenolato-oxygen bridges and the μ-aqua bridge, as shown in Fig. 1.…”

Tetranuclear Nickel(II) Complex with an Unsymmetrical Pentadentate Schiff-base Ligand Having a Defective Double-Cubane Core

“…The Ni-O and Ni-N bond lengths are 2.0182(18)-2.153(2)Å and 1.975(2)Å for six-coordinate Ni1 and 1.975(2)-2.0335(17)Å and 1.976(2)Å for five-coordinate Ni2, respectively (Table 2), which are within the observed range for high-spin nickel(II) complexes. 3,10,11 In the crystal, there is no intermolecular interaction between the tetranuclear molecules, showing a Table 2 Selected bond distances (Å) and angles ( ) discrete tetranuclear nickel(II) complex (Fig. 3).…”

Ferromagnetic Dinuclear Nickel(II) Complex with a Schiff-base Having a Di-μ-phenolato-μ-methanol-bridged Core

“…10 The magnetic moment of 1 is 3.47 μB at 300 K. This value is larger than the spin-only value of octahedral nickel(II) (2.83 μB, S = 1), being typical for octahedral nickel(II) complexes due to the excited 3 T2 state with the orbital angular momentum. 6,7 As shown in Fig. 5, the moment takes an almost constant value Table 1 Crystal and experimental until 50 K with lowering of the temperature, and then increases, reaching a maximum value of 3.76 μB at 10 K. The decrease below 10 K is most likely due to the zero-field-splitting effect due to the distortions of Ni(II) coordination spheres and/or intermolecular interaction.…”

“…We observed a ferromagnetic interaction in a dinuclear complex of nickel(II) pivalate. 7 Such a ferromagnetic behavior is interesting as a potential magnetic material. Recently we synthesized a dinuclear nickel(II) complex having two-μ-phenolato and μ-aqua bridges with N,N′-disalicylidene-2,2′-(ethylenedioxy)bis(ethylamine) (H2dee), [Ni2(dee)2(μ-H2O)]·2C2H5OH (1), from a reaction of nickel(II) salt and H2dee.…”