High nuclearity Pt–Rh carbonyl clusters. Synthesis and X-ray characterization of the [Pt2Rh11(µ-CO)12(CO)12]3– and [PtRh12(µ-CO)12(CO)12]4– anions

Abstract

Two new high nuclearity cluster anions, [Pt₂Rh₁₁(CO)₂₄]^3– and [PtRh₁₂(CO)₂₄]^4– have been obtained by controlled pyrolysis of [PtRh₅(CO)₁₅]^–; their structures show the hexagonal close packed metal array found in the isoelectronic series [Rh₁₃H_5–n(CO)₂₄]^n–, with a Pt atom inside a 12 metal atom shell, but with a different arrangement of CO ligands.