Abstract
Three compounds are described from reactions of divalent nickel species and bicyclic guanidinate ligands. These compounds encompass a variety of nuclearities with one being triangular and having an hour-glass shape and the formula Ni3(tbn)6·2LiCl, 1, where tbn is a bicyclic guanidinate anion with fused 5/6 membered rings. A dinuclear compound [(η2-Imeth)Ni(μ-tbo)]2Cl2, 2, contains two fused 5/5 membered rings (tbo) that bridge two divalent nickel atoms and also contains a chelating unit in each metal center. The neutral Imeth (1-(2,3,5,6-tetrahydro-1H-imidazo[1,2-a]imidazol-1-yl)ethanimine) is an imino-containing ligand produced by the Ni(II) catalyzed reaction of tbo with acetonitrile. A mononuclear species, [(η2-hpp)Ni(hpp)(Hhpp)]Cl, 3, is obtained from reaction of NiCl2 with the bicyclic guanidinate ligand with two fused six-member rings in contact with moisture. In all compounds each of the Ni atoms has a local square-planar arrangement common in d8 species.
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Acknowledgments
This work was supported by the Robert A. Welch Foundation and Texas A&M University. CAM also thanks the National Science Foundation (IR/D support).
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Dedicated to Richard D. Adams on the occasion of his 65th birthday.
F. A. Cotton – deceased, February 20, 2007.
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Chiarella, G.M., Cotton, F.A. & Murillo, C.A. Acetonitrile Activation Promoted by Divalent Nickel Species with Bicyclic Guanidinate Ligands. J Clust Sci 23, 673–684 (2012). https://doi.org/10.1007/s10876-012-0455-1
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DOI: https://doi.org/10.1007/s10876-012-0455-1