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- W2015654456 abstract "Two-electron mixed-valence bimetallic cores of iridium are stabilized in a diphosphazane, MeN[P(OCH2CF3)2]2 (bis(bis(trifluoroethoxy)phosphino)methylamine, tfepma) coordination sphere. Treatment of [Ir(cod)Cl]2 with tfepma affords the Ir20,II complex, Ir2(tfepma)3Cl2 (1), in which the Ir0 and IrII centers assume trigonal bipyramidal and square pyramidal coordination geometries, respectively. The coordinatively unsaturated two-electron mixed-valence core of 1 supports an extensive acid−base and oxidation−reduction chemistry. As established by single crystal X-ray analysis, two-electron donor ligands are readily received at the IrII center of 1 to complete the octahedral coordination environment that is preferred by a d7 metal−metal bonded center. Alternatively, redox-active substrates rapidly add across the single metal−metal bond of 1 to form Ir2I,III mixed-valence complexes; the chlorine and hydrochloric acid adducts, Ir2(tfepma)3Cl4 (5) and Ir2(tfepma)3HCl3 (7b), respectively, have been characterized by NMR spectroscopy and X-ray crystallography. Likewise, H2 reacts with 1 to afford an Ir2I,III dihydride complex, Ir2(tfepma)3H2Cl2 (8). Single-crystal X-ray and NMR analyses of 8 reveal that a single hydride ligand is coordinated at each iridium center of the bimetallic core. Hydrogen is readily removed from the complex in solution and the solid state, providing the first example of the reversible addition of dihydrogen across a single metal−metal bond." @default.
- W2015654456 created "2016-06-24" @default.
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- W2015654456 date "2000-09-14" @default.
- W2015654456 modified "2023-10-17" @default.
- W2015654456 title "Hydrido, Halo, and Hydrido-Halo Complexes of Two-Electron Mixed-Valence Diiridium Cores" @default.
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- W2015654456 doi "https://doi.org/10.1021/ja001491q" @default.
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