2993center as follows: Mn' contributes 24 electrons, three carbonyl ligands donate 6 electrons, two metal-hydrogen-boron bonds contribute 4 electrons, and the halogen contributes the final 2 electrons for a total of 36.Similar bonding schemes will undoubtedly be found in other metal-borane cluster systems. The presence of multidentate M-H-B bonding to several metal centers may have important implications vis-%-vis our future understanding of the mechanisms of metal cluster growth processes.

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tional parameters and their errors (Tables S2 and S7), thermal parameters (Tables S3 and S8), bond distances (Tables S4 and S9), bond angles (Tables S5 and S10), and electronic absorption spectral data (Table SI 1), and figures showing the full atomic number schemes for the monocations of I (Figure SI) and 2 (Figure S2) and the X-band ESR spectrum of [Re2Cl3(M-HN2C2Me2)(M-dppm)2(NCMe)]PF6 (Figure S3) (44 pages); tables of observed and calculated structure factors (82 pages). Ordering information is given on any current masthead page.