NDLI: Interaction of ethene and ethyne with bare and hydrogenated Ir<sub>4</sub> clusters. A density functional study

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Interaction of ethene and ethyne with bare and hydrogenated Ir₄ clusters. A density functional study

Content Provider	Royal Society of Chemistry (RSC)
Author	Petrova, Galina P. Rösch, Notker Vayssilov, Georgi N.
Copyright Year	2011
Abstract	The paper reports a computational study of species that can be formed during ethene hydrogenation on iridium clusters. The simulated concentrations of the complexes (C2Hm)Ir4Hn (m = 2–5, 0 ≤ n ≤ 14 − m) based on calculated Gibbs free energies suggest at low temperature and high hydrogen pressure π-bonded ethene to be the dominant species at the Ir4 cluster covered by hydrides. At higher temperature and lower H2 pressure, this model predicts ethylidyne and, subsequently, di-σ-coordinated ethyne with a minor or zero amount of hydride ligands on the metal cluster. Ethyl, vinyl, and vinylidene species were calculated to be less stable over the range of the hydrogen coverage studied. Ethane desorption from the most stable complex was calculated to be thermodynamically favorable for systems in which at least three hydride ligands will remain on the metal cluster after desorption. Adsorption of one of these organic ligands and/or hydrogen results in an oxidation of the metal moiety; this effect is more pronounced in complexes with ethylidyne, vinyl, and vinylidene. The calculated vibrational spectra of ethylidyne on Ir4Hn clusters agree well with available experimental data for this species on iridium surfaces and supported metal particles. The spectra of the various organic species in the region of C–H stretching modes (3300–2700 cm−1) were calculated to overlap, in particular in the presence of hydride ligands on the metal moiety.
Starting Page	958
Ending Page	970
Page Count	13
File Format	HTM / HTML PDF
ISSN	20444753
Volume Number	1
Issue Number	6
Journal	Catalysis Science & Technology
DOI	10.1039/c1cy00114k
Language	English
Publisher	Royal Society of Chemistry
Access Restriction	Open
Subject Keyword	Adsorption Hydrogen Methylidenecarbene Ethylene Gibbs Cluster chemistry Hydride Iridium Hydrogenation Ethyl Ethane Acetylene
Content Type	Text
Resource Type	Article
Subject	Catalysis

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