Electronic structure of a catalyst poison: Br/Pt(110)

Menzel, A.; Swamy, K.; Beer, Ronny; Hanesch, P.; Bertel, E.; Birkenheuer, U.

doi:10.1016/s0039-6028(00)00074-1

Cited by 15 publications

(6 citation statements)

References 18 publications

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“…In summary, for Br/Pt͑110͒ we can exclude an ionic bonding model. This corroborates our previous arguments for covalent bonding and a covalent poisoning mechanism 82 which were based on photoemission results. ͑iii͒ Local versus nonlocal mass transport.…”

Section: Discussionsupporting

confidence: 92%

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Structure of thec(2×2)-Br/Pt(110) surface

et al. 2002

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We present a detailed investigation of the c(2ϫ2)-Br/Pt(110) adlayer structure supplemented by the analysis of the (1ϫ2) missing-row ͑MR͒ structure of the clean Pt͑110͒ surface. Quantitative low energy electron diffraction analyses and first-principles calculations are in impressive agreement in both cases. The clean surface reconstruction is determined with unprecedented accuracy. For the adsorbate, the analysis retrieves a simple Br-adlayer structure with the Br atoms residing in every second short bridge position on the closepacked Pt rows with the MR reconstruction lifted. The Br-Pt bond length Lϭ2.47 Å is almost equal to the sum of the atomic radii. The substrate below the adsorbate exhibits a contraction of the first layer spacing which amounts to half of that calculated for an unreconstructed clean surface.

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Section: Discussionsupporting

confidence: 92%

“…A covalent bonding is also indicated by the experimental work function and photoemission data. 16,82 Finally, theoretical STM images were calculated on the basis of the Tersoff-Hamann formalism. They unequivocally show Br imaged as protrusion in contrast to the previously given interpretation of the STM images.…”

Section: Discussionmentioning

confidence: 99%

Structure of thec(2×2)-Br/Pt(110) surface

et al. 2002

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“…We attribute the peculiar bonding characteristics of H on Pt to a strong covalent interaction with the Pt d-orbitals. As we have suggested earlier for Br/Pt(110) [23] and also in a comparative study of CO-bonding on the transition metal surfaces [24], these bonding characteristics result from the relativistic contraction of the s-orbitals and the concomitant d-shell expansion.…”

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confidence: 61%

Chemisorption of hydrogen on the missing-row Pt(110)-(1 × 2) surface

et al. 2007

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Chemisorption of hydrogen on the missing-row reconstructed Pt(110)-(1 · 2) surface has been studied by TPD, quantitative LEED, and DFT calculations. An (atypical) chemisorption site on the outermost close-packed rows with an ideal coverage of 0.5 ML (b 2 -state) is found. Adsorption sites on the (111) microfacets are occupied only at higher coverage (b 1 -state). After exposures of more than 400 L, the TPD spectra clearly reveal the controversly discussed a-state. In the same coverage range, an intense 1 · 4 superstructure becomes visible at LEED energies around 50 eV. The saturation coverage for chemisorption at T = 120 K is 33% higher than assumed previously.

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“…Thus, we tentatively assign this third component to the bromine adatoms grouped in linear chains. The chains can be composed solely of bromine atoms, similar to 2D Br islands formed on a Cu(111) surface at similar temperatures25, 38 or they can consist of alternate ‐Br‐Cu‐ 1D chains similar to those observed on a Pt(110) surface 39. The corresponding BrCu compound40 is expected to have the Br 3d 5/2 peak maximum centered at 69.2 eV,41 which is close to the value of component 3.…”

Section: Resultsmentioning

confidence: 83%

“…The chains can be composed solely of bromine atoms, similar to 2D Br islands formed on aC u(111)s urface at similar temperatures [25,38] or they can consist of alternate -Br-Cu-1D chains similar to those observed on aP t(110) surface. [39] The corresponding BrCu compound [40] is expected to have the Br 3d 5/2 peak maximum centered at 69.2 eV, [41] which is close to the value of component 3. Further investigation will be required to definitelya nswer the true composition of the 1D chains.…”

Section: Resultsmentioning

confidence: 94%

Control of the Intermolecular Coupling of Dibromotetracene on Cu(110) by the Sequential Activation of CBr and CH Bonds

Ferrighi

Píš

Nguyễn

et al. 2015

Chemistry A European J

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Dibromotetracene molecules are deposited on the Cu(110) surface at room temperature. The complex evolution of this system has been monitored at different temperatures (i.e., 298, 523, 673, and 723 K) by means of a variety of complementary techniques that range from STM and temperature-programmed desorption (TPD) to high-resolution X-ray spectroscopy (XPS) and near-edge X-ray absorption fine structure spectroscopy (NEXAFS). State-of-the-art density-functional calculations were used to determine the chemical processes that take place on the surface. After deposition at room temperature, the organic molecules are transformed into organometallic monomers through debromination and carbon-radical binding to copper adatoms. Organometallic dimers, trimers, or small oligomers, which present copper-bridged molecules, are formed by increasing the temperature. Surprisingly, further heating to 673 K causes the formation of elongated chains along the Cu(110) close-packed rows as a consequence of radical-site migration to the thermodynamically more stable molecule heads. Finally, massive dehydrogenation occurs at the highest temperature followed by ring condensation to nanographenic patches. This study is a paradigmatic example of how intermolecular coupling can be modulated by the stepwise control of a simple parameter, such as temperature, through a sequence of domino reactions.

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Electronic structure of a catalyst poison: Br/Pt(110)

Cited by 15 publications

References 18 publications

Structure of thec(2×2)-Br/Pt(110) surface

Structure of thec(2×2)-Br/Pt(110) surface

Chemisorption of hydrogen on the missing-row Pt(110)-(1 × 2) surface

Control of the Intermolecular Coupling of Dibromotetracene on Cu(110) by the Sequential Activation of CBr and CH Bonds

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