Heteronucleare clustersysteme : XVIII. Methylidyn-, silylidyn- und germylidyn-nanocarbonyl-triiridium-cluster

NaIr(CO)₄ reacts with Cl₃CL (L = CH₃, C₆H₅), Cl₃SiCH₃ or Cl₃GeCH₃ to form the novel cluster compounds (CO)₉Ir₃CCH₃ (I), (CO)₉Ir₃CC₆H₅ (II), (CO)₉IrSi- CH₃ (III) and (CO)₉Ir₃GeCH₃ (IV), respectively. Comparison of the IR spectra in the ν(CO) region with those of the structurally well established methylidyne clusters (CO)₉Co₃CL shows equivalent symmetry conditions. The analytical and IR data enable possible structures to be proposed.