Hydride tetrahedral cluster complexes with

In the report that described the synthesis of 108 (777), Whitmire also observed that the reaction between NaBi03 and methanolic [Fe(CO)s] in the presence of hydroxide afforded the trianionic species [Bi Fe(CO)4 4]3, 110, which was subsequently characterized by X-ray crystallography (775). Cluster 110 contains a central bismuth atom tetrahedrally coordinated by four Fe(CO)4 fragments and is isoelectronic with the anionic tetracobalt-indium complex, 27, and the neutral tetracobalt-germanium, - tin, and -lead complexes, 68, 71, and 72. Oxidation of 110 affords 108 (777), while acidification (772) yields the hydride-containing cluster [BiFe3(CO)9(/i-H)3], 111, which also contains a tetrahedral BiFe3 core. Johnson and Lewis (114) have... 

An earlier single crystal X-ray diffraction provided an accurate determination of the non-hydrogen atom positions in the tetrahedral cluster hydride complex [Re4(/t3-H)4(CO)i2]-2C6D6 89, but necessarily with much less accurate determinations of hydrogen atom positions. " Time-of-flight neutron powder data was then used to provide accurate location of hydrogen (and deuterium) atoms, and a combined refinement of the complete structure based upon simultaneous use of both sets of diffraction data was employed. ... 

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