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Role of the Metal in the Bonding and Properties of Bimetallic Complexes Involving Manganese, Iron, and Cobalt
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    Role of the Metal in the Bonding and Properties of Bimetallic Complexes Involving Manganese, Iron, and Cobalt
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    Department of Chemistry, University of Minnesota, 207 Pleasant Street SE, Minneapolis, Minnesota 55455-0431, United States
    Supercomputing Institute and Chemical Theory Center, University of Minnesota, Minneapolis, Minnesota 55455, United States
    § Max Planck Institut für Chemische Energiekonversion, Stiftstraße 34-36, 45470 Mülheim an der Ruhr, Germany
    ChemMatCARS, University of Chicago, Argonne, Illinois 60439, United States
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    Cite this: J. Am. Chem. Soc. 2014, 136, 5, 1842–1855
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    https://doi.org/10.1021/ja409016w
    Published October 14, 2013
    Copyright © 2013 American Chemical Society

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    A multidentate ligand platform is introduced that enables the isolation of both homo- and heterobimetallic complexes of divalent first-row transition metal ions such as Mn(II), Fe(II), and Co(II). By means of a two-step metalation strategy, five bimetallic coordination complexes were synthesized with the general formula M1M2Cl(py3tren), where py3tren is the triply deprotonated form of N,N,N-tris(2-(2-pyridylamino)ethyl)amine. The metal–metal pairings include dicobalt (1), cobalt–iron (2), cobalt–manganese (3), diiron (4), and iron–manganese (5). The bimetallic complexes have been investigated by X-ray diffraction and X-ray anomalous scattering studies, cyclic voltammetry, magnetometry, Mössbauer spectroscopy, UV–vis–NIR spectroscopy, NMR spectroscopy, combustion analyses, inductively coupled plasma optical emission spectrometry, and ab initio quantum chemical methods. Only the diiron chloride complex in this series contains a metal–metal single bond (2.29 Å). The others show weak metal–metal interactions (2.49 to 2.53 Å). The diiron complex is also distinct with a septet ground state, while the other bimetallic species have much lower spin states from S = 0 to S = 1. We propose that the diiron system has delocalized metal–metal bonding electrons, which seems to correlate with a short metal–metal bond and a higher spin state. Multiconfigurational wave function calculations revealed that, indeed, the metal–metal bonding orbitals in the diiron complex are much more delocalized than those of the dicobalt analogue.

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    Additional NMR spectra, CV and X-ray crystallography details, and computational data. This material is available free of charge via the Internet at http://pubs.acs.org.

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    Journal of the American Chemical Society

    Cite this: J. Am. Chem. Soc. 2014, 136, 5, 1842–1855
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    https://doi.org/10.1021/ja409016w
    Published October 14, 2013
    Copyright © 2013 American Chemical Society

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