We present a combined anion photoelectron spectroscopic and quantum chemical investigation on the structures and bonding properties of CPt and CPtH. The experimental vertical detachment energies of CPt and CPtH are measured to be 1.91 ± 0.08 and 3.54 ± 0.08 eV, respectively. CPt is identified as a C symmetric Pt-C-Pt bent structure, and CPt has a D symmetric Pt-C-Pt linear structure. Both anionic and neutral CPtH adopt a Pt-C-Pt-H chain-shaped structure, in which the ∠PtCPt and ∠CPtH bond angles of CPtH are larger than those of CPtH. The Pt-C bonds in CPt and CPtH exhibit covalent double bonding characters. The Pt=C bonds are much stronger than the C-H bond that may explain why the C atom CPtH prefers to form Pt=C bonds rather than C-H bonds. It may also explain why platinum can insert into the C-H bond to activate the C-H bond as reported in the literature.
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