By A. M. Bradshaw (auth.), Louis J. Farrugia (eds.)
The analogy among the chemistry of molecular transition steel clusters and the procedures of chemisorption and catalysis at steel surfaces (the Cluster Surface analogy) has for a couple of years supplied an interaction among experimental and theoretical inorganic and actual chemists. This collaborative strategy has born fruit within the use of good outlined modes of metal-ligand bonding in discrete molecular clusters, versions for metal-ligand binding on surfaces. many of the key issues mentioned in The Synergy betweenDynamics and Reactivity at Clusters and Surfaces are: (1) Mechanisms of the fluxional behaviour in clusters within the liquid section and the connections with diffusion techniques on prolonged surfaces. The function of metal-metal bond breaking in diffusion. (2) Analogies within the constitution of chemisorbed species and similar ligands on metal clusters. (3) Analogies among benzene floor chemistry on prolonged steel surfaces and on steel surfaces in molecular cluster compounds with specific connection with structural distortions. (4) The position of cellular precursors for dissociation of chemisorption on prolonged metals and on clusters. Are there analogies within the ligand attachment in the course of cluster compound synthesis? (5) The position of illness websites on steel surfaces in catalyzing chemical reactions and the relationship to the precise bonding houses of websites on steel clusters having lowest metal-metal coordination. (6) the dimensions of steel clusters had to mimic floor phenomena on bulk steel surfaces. varied websites wanted for various phenomena.
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Extra resources for The Synergy Between Dynamics and Reactivity at Clusters and Surfaces
The Pt/Si02 surfaces were then dosed with a collimated and calibrated effusive beam doser achievbing accurate CO fluences on the sample . The CO desorption from the ~ particles on the SiOz surface was measured with a differentially pumped, apertured and multiplexed line-of-sight quadrupole mass spectrometer (UTI l00c equipped with a Cu/Be-mIltiplier). A skimmer with a diameter of 5mm was used as the aperture, and was located close to the surface for desorption experiments. The aperture was electrically isolated and kept at a voltage of -90V during CO desorption experinmts in order to avoid electron stimulated desorption and charging effects on the Si0 2 by electrons emitted from the filament of the mass spectrometer .
Soc. 114, 74527458. W. Braun, H. Kuhlenbeck (1987) Surface Science, 180, 279-288. FJ. R McFeely, A. A. Yarnoff (1988) Phys. Rev. B. 38, 6084-6096. FJ. Grunthaner, PJ. Grunthaner, RP. F. Lewis, J. Maserjian and A. Madhukar (1979) ,Phys. Rev. Let. 43, 1683-1686. A. Masson, B. Bellamy, Y. Hadji Romdhane, M. Che, H. Roulet and G. Dufour (1986) Surf. Sci. 173,479-497. NMR INVESTIGATION OF BINDING OF AROMATICS AT CATALYTIC SURFACES A Deuterium NMR Study Cecil Dybowski and Mark A. Heppl Department of Chemistry and Biochemistry University of Delaware Newark, Delaware 19716 1.
8 Kls . 6 X 10 15 nulecules/crrr. Isotopically labeled 13CO was used to improve the signal-to-noise ratio, avoiding the 28 amu background signal. ° 40 3. Results. 1 Temperature Programmed Desorption of PtjSiOz Samples. 006 ML of Pt trimers and a clean SiOiSi substrate. 6 x 1015 CO rmlecules/cm2• For the three samples containing Pt l , P~ and 1\ cluster deposits, CO is readily chemisorbed at 300 K. For Ptl three desorption peaks are observed one at 340 K and two lower intensity peaks at 400 K and 440 K.