Sterenberg, Brian T. Jenkins, Hilary A. Puddephatt, Richard J. Complexes with Platinum−Iridium Bonds:  Stepwise Formation of a PtIr<sub>2</sub> Cluster Complex The reaction of [Pt(dppm)<sub>2</sub>]Cl<sub>2</sub> (dppm = Ph<sub>2</sub>PCH<sub>2</sub>PPh<sub>2</sub>) with [Ir(CO)<sub>4</sub>]<sup>-</sup> and dppm in a 1:2:1 ratio leads in a multistep reaction to the new heteronuclear cluster complex [PtIr<sub>2</sub>(CO)<sub>2</sub>(μ-CO)(μ-dppm)<sub>3</sub>], which contains a triangle of metal atoms with each edge bridged by a dppm ligand and in which only the platinum atom is coordinatively unsaturated. The initial step in the reaction leads to formation of the neutral and cationic binuclear complexes [PtIrCl(CO)<sub>2</sub>(μ-dppm)<sub>2</sub>] and [PtIr(CO)<sub>3</sub>(μ-dppm)<sub>2</sub>]<sup>+</sup>, respectively. The binuclear complexes then react with additional [Ir(CO)<sub>4</sub>]<sup>-</sup> to form the cluster [PtIr<sub>2</sub>(CO)<sub>4</sub>(μ-CO)(μ-dppm)<sub>2</sub>] by insertion into a Pt−P linkage; this cluster can exist in two isomeric forms, each containing a triangular PtIr<sub>2</sub> group with the Ir−Ir and one Pt−Ir edge bridged by dppm ligands but differing in stereochemistry. These isomers equilibrate slowly at room temperature, and each reacts easily with dppm to form the final cluster complex [PtIr<sub>2</sub>(CO)<sub>2</sub>(μ-CO)(μ-dppm)<sub>3</sub>]. The structures of the complexes [PtIr<sub>2</sub>(CO)<sub>2</sub>(μ-CO)(μ-dppm)<sub>3</sub>], [PtIr(CO)<sub>3</sub>(μ-dppm)<sub>2</sub>][PF<sub>6</sub>], and one isomer of [PtIr<sub>2</sub>(CO)<sub>4</sub>(μ-CO)(μ-dppm)<sub>2</sub>] have been determined crystallographically, and the reaction sequence has been determined by monitoring reactions through NMR methods. PF;Ph 2 PCH 2 PPh 2;PtIr 2 group;dppm;PtIr 2 Cluster Complex;PtIr 2;CO;NMR;cluster 1998-12-24
    https://acs.figshare.com/articles/dataset/Complexes_with_Platinum_Iridium_Bonds_Stepwise_Formation_of_a_PtIr_sub_2_sub_Cluster_Complex/3783312
10.1021/om980665y.s001