A tetranuclear nickel(II) cluster: bis[μ3-2,6-bis(methylamino)pyridine(2−)-κ4N2:N1,N6:N6]bis[μ3-2,6-bis(methylamino)pyridine(1−)-κ3N1:N2:N2]dichloridotetranickel(II)
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The title compound, [Ni4(C7H9N3)2(C7H10N3)2Cl2], was obtained from a reaction in which 2,6-dimethyl-amino-pyridine, in the presence of methyl-lithium used to deprotonate the organic ligand precursor, was added to NiCl2 during an attempt to synthesize a linear trinuclear nickel chain. During this reaction, two equivalents of the amine were fully deprotonated, forming dianions, and the three N atoms coordinate to Ni centers. The other two equivalents of the amine were only partially deprotonated, giving monoanions in which only two N atoms coordinate to Ni centers. In this tetra-nuclear complex, two of the four Ni atoms have square-planar coordination and are bonded to four N donors, while the other two are in a distorted tetra-hedral geometry, with three coordination sites occupied by N donors and the fourth by a Cl atom. The mol-ecule is noncentrosymmetic but the crystal structure is racemic. © International Union of Crystallography 2007.
author list (cited authors)
Cotton, F. A., Murillo, C. A., & Wang, Q.