摘要：

The title complex crystallizes in the monoclinic space group P21/n with unit-cell dimensions a= 14.334 (2), b= 29.231(4), c= 24.626(3)Å, β= 94.61(3)°, and Z= 4. The structure has been determined by conventional methods from X-ray single-crystal counter data and refined by least-squares calculations to R 0.061 for 7 286 significant diffraction intensities. The [Rh13H2(CO)24]3– anion contains a polyhedron of rhodium atoms consisting of a fragment of hexagonal close packing (D3h symmetry). The mean Rh–Rh distance is 2.794 Å. Twelve of the CO ligands are terminally bonded and 12 symmetrically edge bridging on half of the polyhedron edges; the idealized overall molecular symmetry is Cs. On the basis of the Rh–Rh distances and of the holes left by the ligands on the cluster surface, the hydride atoms have been located in two semi-octahedral cavities of the cluster.

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