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• W2167642210 abstract "We have used fast time-resolved infrared spectroscopy to characterize a series of organometallic methane and ethane complexes in solution at room temperature: W(CO) 5 (CH 4 ) and M(η 5 C 5 R 5 )(CO) 2 (L) [where M = Mn or Re, R = H or CH 3 (Re only); and L = CH 4 or C 2 H 6 ]. In all cases, the methane complexes are found to be short-lived and significantly more reactive than the analogous n -heptane complexes. Re(Cp)(CO) 2 (CH 4 ) and Re(Cp*)(CO) 2 (L) [Cp* = η 5 C 5 (CH 3 ) 5 and L = CH 4 , C 2 H 6 ] were found to be in rapid equilibrium with the alkyl hydride complexes. In the presence of CO, both alkane and alkyl hydride complexes decay at the same rate. We have used picosecond time-resolved infrared spectroscopy to directly monitor the photolysis of Re(Cp*)(CO) 3 in sc CH 4 and demonstrated that the initially generated Re(Cp*)(CO) 2 (CH 4 ) forms an equilibrium mixture of Re(Cp*)(CO) 2 (CH 4 )/Re(Cp*)(CO) 2 (CH 3 )H within the first few nanoseconds (τ = 2 ns). The ratio of alkane to alkyl hydride complexes varies in the order Re(Cp)(CO) 2 (C 2 H 6 ):Re(Cp)(CO) 2 (C 2 H 5 )H > Re(Cp*)(CO) 2 (C 2 H 6 ):Re(Cp*)(CO) 2 (C 2 H 5 )H ≈ Re(Cp)(CO) 2 (CH 4 ):Re(Cp)(CO) 2 (CH 3 )H > Re(Cp*)(CO) 2 (CH 4 ):Re(Cp*)(CO) 2 (CH 3 )H. Activation parameters for the reactions of the organometallic methane and ethane complexes with CO have been measured, and the ΔH ‡ values represent lower limits for the CH 4 binding enthalpies to the metal center of W CH 4 (30 kJ·mol −1 ), Mn CH 4 (39 kJ·mol −1 ), and Re CH 4 (51 kJ·mol −1 ) bonds in W(CO) 5 (CH 4 ), Mn(Cp)(CO) 2 (CH 4 ), and Re(Cp)(CO) 2 (CH 4 ), respectively." @default.
• W2167642210 created "2016-06-24" @default.
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• W2167642210 date "2007-04-24" @default.
• W2167642210 modified "2023-10-17" @default.
• W2167642210 title "Time-resolved infrared (TRIR) study on the formation and reactivity of organometallic methane and ethane complexes in room temperature solution" @default.
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• W2167642210 doi "https://doi.org/10.1073/pnas.0610567104" @default.
• W2167642210 hasPubMedCentralId "https://www.ncbi.nlm.nih.gov/pmc/articles/1855416" @default.
• W2167642210 hasPubMedId "https://pubmed.ncbi.nlm.nih.gov/17409190" @default.
• W2167642210 hasPublicationYear "2007" @default.
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