Journal
JOURNAL OF PHYSICAL CHEMISTRY LETTERS
Volume 6, Issue 12, Pages 2287-2291Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acs.jpclett.5b00937
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Funding
- Chinese Academy of Sciences (Strategic Priority Research Program) [XDA09030101]
- National Natural Science Foundation of China [21325314, 21203208]
- Major Research Plan of China [2013CB834603, 2011CB932302]
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Laser-ablation-generated and mass-selected iron-carbide cluster anions FeC6- were reacted with CH4 in a linear ion trap reactor under thermal collision conditions. The reactions were characterized by mass spectrometry and density functional theory calculations. Adsorption product of FeC6CH4- was observed in the experiments. The identified large kinetic isotope effect suggests that CH4 can be activated by FeC6- anions with a dissociative adsorption manner, which is further supported by the reaction mechanism calculations. The large dipole moment of FeC6- (19.21 D) can induce a polarization of CH4 and can facilitate the cleavage of C-H bond. This study reports the CH4 activation by transition-metal carbide anions, which provides insights into mechanistic understanding of iron-carbon centers that are important for condensed-phase catalysis.
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