Reaction of 1,2-ethanedithiol on clean, sulfur-modified, and carbon-modified Mo (110) surfaces

Abstract

Articles you may be interested inAngular and energy distributions of D 2 molecules desorbing from sulfur and oxygen modified V(111) surfaces Chemical and spectroscopic surface science investigation of MoO 3 and MoO 3 /Al 2 O 3 ultrathin films J. Vac. Sci. Technol. A 15, 1717 (1997); 10.1116/1.580926 Adsorption state of hydrogen sulfide on the GaAs (001)-(4×2) surface J.The reactivity of 1,2-ethanedithiol on the clean Mo ͑110͒ and p(4ϫ4)-C/Mo ͑110͒ surfaces has been investigated as a function of sulfur coverage using temperature programmed desorption ͑TPD͒, Auger electron spectroscopy, and low energy electron diffraction. TPD experiments performed on both surfaces produced similar reaction products, although changes were observed in selectivity. On the clean Mo ͑110͒ surface, the major products observed during TPD experiments were acetylene, ethylene, vinyl thiol, and ethanethiol. However, the reaction of ethanedithiol on the p(4 ϫ4)-C/Mo ͑110͒ surface produced acetylene, ethylene, and ethanedithiol. Product molecules are thought to arise from two distinct types of surface intermediates: ͑1͒ a monodentate thiolate species bound to the surface through only one of the ethanedithiol sulfur atoms, and ͑2͒ a bidentate organosulfur metallocycle bound to the surface through both of the ethanedithiol sulfur atoms. We propose that vinyl thiol and ethanethiol are produced via C-S bond scission and subsequent hydride elimination of the monodentate thiolate intermediate, and that the bidentate surface metallocycles undergo C-S bond scission to yield acetylene and ethylene. On the carbon-modified surface, complete desulfurization of ethanedithiol occurs upon decomposition, yielding only hydrocarbon products. With increasing sulfur coverage, a decrease in reactivity and a shift in desorption features to lower temperatures is observed for ethanedithiol on the clean and carbon-modified surfaces.

Structural, Optical, and Electrical Properties of Self-Assembled Films of PbSe Nanocrystals Treated with 1,2-Ethanedithiol

“…XPS shows substantial sulfur at the film surface after exposure to EDT (Figure ), and the C−H stretch signal in the FTIR spectra is as strong as expected for quantitative replacement of oleate with EDT (Figure ). The absence of the S−H stretch at ∼2550 cm −1 suggests that adsorbed EDT exists as ethanedithiolate , bound in a bidentate fashion either on single NCs or between NCs. Furthermore, the sulfur 2p 3/2 X-ray photoelectron peak at 161.5 eV is characteristic of bound thiolate rather than the free C−S−H moiety .…”

Enhanced Carrier Dynamics of CsPbBr3 Nanocrystals Enabled by Short-Ligand Ethanedithiol for Efficient Photoelectrocatalytic Photoanodes

“…Moreover, the absorption peak at 2550 cm –1 from the S–H stretching vibration is absent in the EDT-CsPbBr 3 NC sample, indicating that EDT exists in the form of ethanedithiolate (Figure S1). The H 1 NMR spectrum in Figure b shows the characteristic resonances of the ODE at 4.96 and 5.81 ppm in oleate-CsPbBr 3 NCs, indicating long-chain oleate ligands capping on the surface of oleate-CsPbBr 3 NCs. Inversely, resonances of ODE in the EDT-treated sample almost disappeared and the resonance of EDT at 2.83 ppm elucidates the effective removal of long-chain oleate ligands by EDT treatment (the reference H 1 NMR spectra of oleic acid, oleylamine, octadecene, and ethanedithiol are shown in Figure S2).…”

“…Figure 1a compares the FTIR spectra of oleate-CsPbBr S1). 29 The H 1 NMR spectrum in Figure 1b S1. The consistent negative shift of peaks (Cs 3d, Pb 4f, and Br 3d) indicates the interaction between EDT and oleate-CsPbBr 3 NCs.…”

Formation of S-Bearing Complex Organic Molecules in Interstellar Clouds via Ice Reactions with C2H2, HS, and Atomic H

“…Among the possible structures associated with this formula, the most promising candidate for assignment of the band at 158 K is 1,2-ethanedithiol (HSCH 2 CH 2 SH). The relative intensities of the mass fragments match well with the reference values for HSCH 2 CH 2 SH provided by the NIST (Figure , right panel), and the desorption temperature is also in line with a slightly higher value of 180 K measured by Roe and Schulz for one layer of HSCH 2 CH 2 SH on a molybdenum (110) surface with adsorbed carbon.…”