Matrix Isolation Infrared Spectroscopic and Theoretical Studies on the Reactions of Manganese and Iron Monoxides with Methane

摘要

The reactions of manganese and iron monoxides(MnO and FeO)with methane molecules have been investigated using matrix isolation infrared absorption spectroscopy.The metal monoxide molecules were prepared by laser ablation of MnO_2 or Fe_2O_3 targets.The reaction products were identified on the basis of isotopic substitution experiments with ~13CH_4 and CD4,as well as density functional theoretical calculations.In solid argon,manganese and iron monoxides reacted with methane spontaneously on annealing to form the OMn(CH_4)and OFe(CH_4)complexes,which were predicted to have C_2v symmetry with the metal atom coordinated to two hydrogen atoms of the methane molecule.The OMn(CH_4)and OFe(CH_4)complexes underwent photochemical rearrangement to the CH_3MnOH and CH_3FeOH molecules upon ultraviolet irradiation.