American Chemical Society
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Structure and Bonding of the Manganese(II) Phosphide Complex (t-BuPH2)(η5-Cp)Mn{μ-(t-BuPH)}2Mn(Cp)(t-BuPH2)

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posted on 2012-01-09, 00:00 authored by Francesca A. Stokes, Robert J. Less, Joanna Haywood, Rebecca L. Melen, Richard I. Thompson, Andrew E. H. Wheatley, Dominic S. Wright, Adam Johannes Johansson, Lars Kloo
Rather than achieving bis-deprotonation of the phosphine, reaction of Cp2Mn (Cp = cyclopentadienyl) with t-BuPH2 at room temperature yields monodeprotonation of half of the available phosphine in the product (t-BuPH2)­(η5-Cp)­Mn­{μ-(t-BuPH)}2Mn­(Cp)­(t-BuPH2) (1). This complex comprises a Mn­(II) phosphide and is a dimer in the solid state, containing a Mn2P2 diamond core. Consistent with the observation of a relatively short intermetal distance of 2.8717(4) Å in 1, DFT analysis of the full structure points to a singlet ground state stabilized by a direct Mn–Mn single bond. This is in line with the diamagnetic character of 1 and an 18-electron count at Mn.