Abstract

Tetrahedral tri-μ-carbonylenneacarbonyldicobaltdiiridium crystallizes in the monoclinic space group P2 1/ c but an incoherent twinning mechanism leads to apparent orthorhombic diffraction symmetry. The cell parameters are a 9.12(1), b 11.62(1), c 17.31(2) Å, β 90°, Z = 4. Diffractometer data have been refined by full matrix least squares method to a final R of 0.051 for 570 composite reflections [F o( hkl) 2 ort = F o( hkl) 2 mon + F o( h kl ) 2 mon]. The molecular structure of Co 2Ir 2(CO) 12 is very similar to that of Co 4(CO) 12 and Rh 4(CO) 12. Of the CO ligands, 9 are bonded linearly and 3 are involved in edge bridging about a tetrahedron of metal atoms. Cobalt and iridium are partially disordered at the tetrahedron vertices, but iridium has a pronounced preference for the apical position to which only terminal ligands are coordinated.

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