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Ni(II) Dimers of NNO Donor Tridentate Reduced Schiff Base Ligands as Alkali Metal Ion Capturing Agents: Syntheses, Crystal Structures and Magnetic Properties

1
Department of Chemistry, University College of Science, University of Calcutta, 92, A.P.C. Road, Kolkata 700 009, India
2
Department of Chemistry, Haldia Government Colleg, Debhog, Purba Medinipur 721657, India
3
School of Chemistry, The University of Reading, P.O. Box 224, Whiteknights, Reading RG6 6AD, UK
*
Author to whom correspondence should be addressed.
Magnetochemistry 2018, 4(4), 51; https://doi.org/10.3390/magnetochemistry4040051
Received: 22 October 2018 / Revised: 13 November 2018 / Accepted: 14 November 2018 / Published: 21 November 2018
(This article belongs to the Special Issue A Themed Issue in Honor of Late Professor Samiran Mitra)
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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 13 indicate ferromagnetic interactions between dimeric Ni(II) units with J = 3.97 cm−1, 4.66 cm−1, and 5.50 cm−1 for 13, respectively, as is expected from their low phenoxido bridging angles (89.32°, 89.39°, and 87.32° for 13, respectively). The J values have been calculated by broken symmetry DFT method and found to be in good agreement with the experimental values. View Full-Text
Keywords: NiII dimers; sodium ion capturing; ferromagnetic coupling; magnetostructural correlation; DFT calculation NiII dimers; sodium ion capturing; ferromagnetic coupling; magnetostructural correlation; DFT calculation
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Mondal, M.; Chakraborty, M.; Drew, M.G.B.; Ghosh, A. Ni(II) Dimers of NNO Donor Tridentate Reduced Schiff Base Ligands as Alkali Metal Ion Capturing Agents: Syntheses, Crystal Structures and Magnetic Properties. Magnetochemistry 2018, 4, 51.

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