Abstract
CHEMISTRY In some bimetallic complexes, a single hydrogen atom bridges the two metal atoms via metal-hydride bonds. For one of the simpler examples of these compounds, [HCr2(CO)10]−, structural studies at first suggested that the M-H-M geometry was linear with D 4 h symmetry, but subsequent neutron-scattering studies showed that the chromium complex adopted a bent geometry with a disordered hydrogen atom. Vivic et al. describe a metal hydride complex for which neutron scattering reveals a nearly linear M-H-M angle (177.9°). The reaction of (dippm)NiBr2, where dippm is bis(di-isopropylphosphino)methane, with two equivalents of 1-adamantylzinc bromide yielded a dark green solid with the terminal halide ligands in line with the nickel-hydride bonds. Initial studies of the compound's reactivity show that the dippm ligand is highly susceptible to reaction with basic reagents. — PDS J. Am. Chem. Soc. 10.1021/ja047956k (2004).
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