The IrC and PtC anions generated by laser vaporization were identified and characterized by gas-phase photoelectron spectroscopy and quantum-chemical calculations. The straight-chain structures with an MCCC (M = metal; C = carbon) connectivity are found for the isoelectronic IrC, PtC, and AuC clusters. Further elaborate analyses manifest the strikingly structural and bonding similarities between MC clusters and OC revealed. This finding has broadened the notion of autogenic isolobality to the gas-phase clusters that contain Ir, Pt, Au, and C centers.
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