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Updated: Jun 13, 2026

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Manganese(II) and Magnesium(II) Analogies in Iridium Hydride Coordination Chemistry
Till Neumann1, Erwann Jeanneau2, Chloé Thieuleux1
1Laboratory of Catalysis, Polymerization, Processes and Materials (CP2M, UMR 5128) CNRS, Institut de Chimie de Lyon, Universite Claude Bernard Lyon 1, CPE Lyon, 3 rue Victor Grignard, Villeurbanne 69616, France.
Abstract:
Alkane elimination reactions between stable magnesium and manganese dialkyls, [LnM(CH2tBu)2] (M = Mg, Mn), and an iridium polyhydride species, [Cp*IrH4] (Cp* = C5Me5), provide a variety of heterobimetallic Mg-Ir and Mn-Ir hydride complexes. In several cases, their solid-state molecular structures are shown to be virtually identical despite fundamentally different electronic properties of Mg(II) (2p6) and Mn(II) (3d5). A direct comparison of the paramagnetic Mn with the diamagnetic Mg analog enables a comprehensive characterization based on a combination of analytical techniques (single-crystal X-ray diffraction, IR, and NMR spectroscopies), especially with respect to the hydride ligands, traditionally difficult to identify in open-shell species. Nevertheless, such congruence is not universal: the nuclearity and M:Ir stoichiometry depend on the nature of the Mg and Mn dialkyl precursors, which in turn is determined by the type of coligand L, and on the presence of proton-donating reagents in the reaction mixture, revealing subtle differences between the Mg and Mn systems in certain cases.
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