Kept in Line

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Science  02 Jul 2004:
Vol. 305, Issue 5680, pp. 19
DOI: 10.1126/science.305.5680.19c

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 D4h 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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