Methane activation by rhodium cluster argon complexes

Albert, Gerhard; Berg, Christian; Beyer, Martin K.; Achatz, Uwe; Joos, Stefan; Niedner‐Schatteburg, Gereon; Bondybey, V. E.

doi:10.1016/s0009-2614(97)00202-9

Cited by 82 publications

(66 citation statements)

References 16 publications

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“…This is in line with our earlier observation that dehydrogenation of hydrocarbons is reduced if metal clusters are decorated with argon atoms [59][60][61]. Another interesting and valuable result is that collisions lead to loss of at most one argon atom, which shows that the collision energy in our experiment is small: It takes only 10 kJ/mol to remove an Ar from 6 CoAr + .…”

Section: Coarsupporting

confidence: 91%

Ion–molecule reactions of CoAr6+ with nitrogen oxides N2O, NO, and NO2: measuring absolute pressure by shock-freezing of the collision complex

Linde

Höckendorf

Balaj

et al. 2010

Low Temperature Physics

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A new method to determine the absolute pressure in an ultra-high vacuum apparatus is tested using ion molecule reactions with 6 CoAr + . In a collision with a neutral reactant, the complex between Co + and the collision partner is stabilized by evaporation of argon atoms. If 6 CoAr + reacts with collision rate, the absolute pressure can be determined by comparing the experimental collision rate with the collision rate calculated from average dipole orientation theory. The experimental results with N 2 O, NO and NO 2 indeed show that the collision complex is frozen out. Comparison of the rates of primary, secondary and tertiary reaction products, however, suggests that not all collisions of 6 CoAr + are reactive. PACS: 82.30.Fi Ion-molecule, ion-ion, and charge-transfer reactions.

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Section: Coarsupporting

confidence: 91%

Ion–molecule reactions of CoAr6+ with nitrogen oxides N2O, NO, and NO2: measuring absolute pressure by shock-freezing of the collision complex

Linde

Höckendorf

Balaj

et al. 2010

Low Temperature Physics

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“…The magnetic moments, 4,5 electric polarizability, 6 and reactivity with a range of small molecules [7][8][9][10][11][12][13][14][15][16] have been investigated, in many instances revealing a significant size dependence of these properties. In several cases, reaction rate measurements on monodisperse cluster samples have suggested multiple reactivities, indicating the presence of multiple forms of clusters of the same size.…”

Section: Introductionmentioning

confidence: 99%

Probing the structures of gas-phase rhodium cluster cations by far-infrared spectroscopy

Harding

Gruene

Haertelt

et al. 2010

The Journal of Chemical Physics

104

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The geometric structures of small cationic rhodium clusters Rh \documentclass[12pt]{minimal}\begin{document}$_n^+$\end{document}n+ (n = 6–12) are investigated by comparison of experimental far-infrared multiple photon dissociation spectra with spectra calculated using density functional theory. The clusters are found to favor structures based on octahedral and tetrahedral motifs for most of the sizes considered, in contrast to previous theoretical predictions that rhodium clusters should favor cubic motifs. Our findings highlight the need for further development of theoretical and computational methods to treat these high-spin transition metal clusters.

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“…[8][9][10] Similar changes in reactivity with argon coverage, from rapid dehydrogenation to sticking of CH 4 , have been observed for Pt + atomic ions. [18] The Ar coverage dependence of the reactions of Rh n Ar m + with methane has been investigated in detail, [19] showing the formation of Rh n [C,4H] + and Rh n -[C,2H] + complexes, while most bare Rh n + clusters (except Rh 2 + ) are essentially unreactive towards methane. Mass spectrometry alone cannot, however, provide detailed information about the structures of the complexes.…”

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confidence: 99%