Abstract
Three trinuclear Ni(II)-Na(I) complexes,[Ni2(L1)2NaCl3(H2O)]·H2O (1), [Ni2(L2)2NaCl3(H2O)] (2), and [Ni2(L3)2NaCl3(OC4H10)] (3) have been synthesized using three different NNO donor tridentate reduced Schiff base ligands, HL1= 2-[(3-methylamino-propylamino)-methyl]-phenol, HL2= 2-[(3-methylamino-propylamino)-methyl]-4-chloro-phenol, and HL3= 2-[(3-methylamino-propylamino)-methyl]-6-methoxy-phenol that had been structurally characterized. Among these complexes, 1 and 2 are isostructural in which dinuclearNi(II) units act as metalloligands to bind Na(I) ions via phenoxido and chlorido bridges. The Na(I) atom is five-coordinated, and the Ni(II) atom possesses hexacordinated distorted octahedral geometry. In contrast, in complex 3, two -OMe groups from the dinuclear Ni(II) unit also coordinate to Na(I) to make its geometry heptacordinated pentagonal bipyramidal. The magnetic measurements of complexes 1–3 indicate ferromagnetic interactions between dimeric Ni(II) units with J = 3.97 cm−1, 4.66 cm−1, and 5.50 cm−1for 1–3, respectively, as is expected from their low phenoxido bridging angles (89.32°, 89.39°, and 87.32° for 1–3, respectively). The J values have been calculated by broken symmetry DFT method and found to be in good agreement with the experimental values.
Highlights
During the past few decades, synthesis and characterizations of polynuclear transition metal complexes and their magnetic and electronic properties have received much attention from chemists due to their potential applications in magnetic ordering and catalytic and biological mimicking [1,2,3,4,5,6,7,8,9]
The literature shows that exploiting this property, various N2O2 or N2O4 donor Schiff base ligands have been used widely for the synthesis of 3d-3d, 3d-4f/5f, and 3d-ns heterometallic complexes [10,11,12,13,14,15,16]
The two Ni(II) centers are connected through two phenoxido bridges and one chlorido bridge
Summary
During the past few decades, synthesis and characterizations of polynuclear transition metal complexes and their magnetic and electronic properties have received much attention from chemists due to their potential applications in magnetic ordering and catalytic and biological mimicking [1,2,3,4,5,6,7,8,9]. The literature shows that exploiting this property, various N2O2 or N2O4 donor Schiff base ligands have been used widely for the synthesis of 3d-3d , 3d-4f/5f, and 3d-ns heterometallic complexes [10,11,12,13,14,15,16]. For example, with Ni(II), these N2O donor ligands form diphenoxido bridged dinuclear complexes [20,21,22]. These complexes attracted significant attention due to their importance in the study of magnetic coupling between the metal centers through the phenoxido bridges [23,24,25].
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