A heteronuclear [nickel(II)–sodium] infinite chain complex derived from 3-{[(2-diethylamino-ethyl)-methyl-amino]-methyl}-2-hydroxy-5-methyl-benzaldehyde

Three high-nuclearity NiII-substituted polyoxometalate compounds functionalized by exogenous ligands have been synthesized and characterized. The octanuclear complexes in Na15[Na{(A-R-SiW9O34)Ni4(CH3COO)3(OH)3}2] . 4NaCl . 36H2O (1) and Na15[Na{(A-R-SiW9O34)Ni4(CH3COO)3(OH)2(N3)}2] . 32H2O (2) can be described as two {Ni4} subunits connected via a {Na(CH3COO)6} group, with the acetato ligands also ensuring in each subunit the connection between the paramagnetic centers. In 2, two azido groups replace two of the six mu-hydroxo ligands present in 1. The nonanuclear complex K7Na7[(A-R-SiW9O34)2Ni9(OH)6(H2O)6(CO3)3] . 42H2O (3) exhibits a double cubanestructure with two [(A-R-SiW9O34)Ni4(OH)3]5- subunits linked by three carbonato ligands. A ninth NiII center connected to one subunit via a carbonato ligand and a O=W group completes this asymmetric polyoxometalate.Electronic spectroscopy and electrochemical studies indicate that, while compounds 1-3 decompose in a pure aqueous medium, these complexes are very stable in a pH 6 acetate medium. The cyclic voltammetry pattern of each complex is constituted by a first eight-electron reduction wave followed by a second large-current intensity wave. The characteristics of the first waves of the complexes are clearly distinct from those obtained for their lacunary precursor [A-R-SiW9O34]10-, a feature that is due to the Ni centers in the complexes. Such observations of electroactive, stable, and highly nickel-rich polyoxometalates are not common. Measurements of the magnetic susceptibility revealed the occurrence of concomitant ferromagnetic and antiferromagnetic interactions in 1 and 3.For both of these compounds, the extension of the magnetic exchange has been determined by means of a spin Hamiltonian with three and four J constants, respectively.

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Anion mediated formation of different Schiff bases from the same precursors and their nickel(II) complexes with different nuclearity

Guha

Banerjee

Mondol

et al. 2011

Journal of Coordination Chemistry

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A heteronuclear [nickel(II)–sodium] infinite chain complex derived from 3-{[(2-diethylamino-ethyl)-methyl-amino]-methyl}-2-hydroxy-5-methyl-benzaldehyde

Cited by 4 publications

References 6 publications

Advances in acyclic compartmental ligands and related complexes

Advances in acyclic compartmental ligands and related complexes

Octa- and Nonanuclear Nickel(II) Polyoxometalate Clusters: Synthesis and Electrochemical and Magnetic Characterizations

Anion mediated formation of different Schiff bases from the same precursors and their nickel(II) complexes with different nuclearity

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