title: Cobalt-Magnesium and Iron-Magnesium Complexes with Weakened Dinitrogen Bridges.
abstract: The cooperative binding of N2by late transition metals and main-group metals is a promising strategy for N-N bond weakening and activation. We report the use of activated Rieke magnesium for reduction of iron and cobalt complexes supported by bulky β-diketiminate ligands. Binding of N2is accompanied by assembly of a linear M-NN-Mg-NN-M (M = Co, Fe) core with N-N bonds that are weakened, as judged by infrared spectroscopy. Both the cobalt and iron complexes require THF solvent, because of Mg-THF binding. The cobalt complex can be isolated as a pure solid, but the iron complex is stable only in solution. These results demonstrate the correlation between the binding mode and N-N weakening in heterobimetallic N2complexes.
authors.affiliation: Department of Chemistry, University of Rochester, Rochester, NY 14618, , Homepage: http://chem.rochester.edu/~plhgrp/
authors.forename: Thomas R
authors.initials: TR
authors.lastname: Dugan
authors.affiliation: Department of Chemistry, University of Rochester, Rochester, NY 14618, , Homepage: http://chem.rochester.edu/~plhgrp/
authors.forename: K Cory
authors.initials: KC
authors.lastname: Macleod
authors.affiliation: Department of Chemistry, University of Rochester, Rochester, NY 14618, , Homepage: http://chem.rochester.edu/~plhgrp/
authors.forename: William W
authors.initials: WW
authors.lastname: Brennessel
authors.affiliation: Department of Chemistry, University of Rochester, Rochester, NY 14618, , Homepage: http://chem.rochester.edu/~plhgrp/
authors.forename: Patrick L
authors.initials: PL
authors.lastname: Holland
keywords: Backbonding; Cobalt; Dinitrogen; Iron; Magnesium