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Dinitrogen Insertion and Cleavage by a Metal-Metal Bonded Tricobalt(I) Cluster
Mary C Eaton1, Vincent J Catalano2, Jason Shearer3
1Center for Catalysis and Florida Center for Heterocyclic Compounds, Department of Chemistry, University of Florida, Gainesville, Florida 32611-7200, United States.
Abstract:
Reduction of a tricobalt(II) tri(bromide) cluster supported by a tris(β-diketiminate) cyclophane results in halide loss, ligand compression, and metal-metal bond formation to yield a 48-electron CoI3 cluster, Co3L (2). Upon reaction of 2 with dinitrogen, all metal-metal bonds are broken, steric conflicts are relaxed, and dinitrogen is incorporated within the internal cavity to yield a formally (μ3-η1:η2:η1-dinitrogen)tricobalt(I) complex, 3. Broken symmetry DFT calculations (PBE0/def2-tzvp/D3) support an N-N bond order of 2.1 in the bound N2 with the calculated N-N stretching frequency (1743 cm-1) comparable to the experimental value (1752 cm-1). Reduction of 3 under Ar in the presence of Me3SiBr results in N2 scission with tris(trimethylsilyl)amine afforded in good yield.
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