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- W2904335186 abstract "Mechanistic aspects of the C–H bond activation of methane by metal-carbide cations MC+ of the 3d transition-metals Sc-Zn were elucidated by NEVPT2//CASSCF quantum-chemical calculations and verified experimentally for M = Ti, V, Fe, and Cu by using Fourier transform ion-cyclotron resonance mass spectrometry. While MC+ species with M = Sc, Ti, V, Cr, Cu, and Zn activate CH4 at ambient temperature, this is prevented with carbide cations of M = Mn, Fe, and Co by high apparent barriers; NiC+ has a small apparent barrier. Hydrogen-atom transfers from methane to metal-carbide cations were found to proceed via a proton-coupled electron transfer mechanism for M = Sc-Co; wherein the doubly occupied πxz/yz-orbitals between metal and carbon at the carbon site serve as electron donors and the corresponding metal-centered vacant π*xz/yz-orbitals as electron acceptors. Classical hydrogen-atom transfer transpires only in the case of NiC+, while ZnC+ follows a mechanistic scenario, in which a formally hydridic hydrogen is transferred. CuC+ reacts by a synchronous activation of two C–H bonds. While spin density is often so crucial for the reactions of numerous MO+/CH4 couples, it is much less important for the C–H bond activation by carbide cations of the 3d transition-metals, in which one notes large changes in bond dissociation energies, spin states, number of d-electrons, and charge distributions. All these factors jointly affect both the reactivity of the metal carbides and their mechanisms of C–H bond activation." @default.
- W2904335186 created "2018-12-22" @default.
- W2904335186 creator A5026786226 @default.
- W2904335186 creator A5059088310 @default.
- W2904335186 creator A5060581153 @default.
- W2904335186 creator A5063912388 @default.
- W2904335186 creator A5075777449 @default.
- W2904335186 date "2018-12-06" @default.
- W2904335186 modified "2023-10-18" @default.
- W2904335186 title "Intrinsic Reactivity of Diatomic 3d Transition-Metal Carbides in the Thermal Activation of Methane: Striking Electronic Structure Effects" @default.
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