Pyridine on flat Pt(111) and stepped Pt(355)—An <i>in situ</i> HRXPS investigation of adsorption and thermal evolution

Wöckel, Claudia; Eilert, André; Welke, Martin; Schöppke, Matthias; Steinrück, Hans‐Peter; Denecke, R.

doi:10.1063/1.4939527

Cited by 10 publications

(18 citation statements)

References 32 publications

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“…Accordingly, component 1 at 398.95 eV which is in the region of unmodified or weakly interacting pyridine 48,55,60 is allocated to the interaction of nitrogen with Cu. The assignments are in line with UHV experiments on pyridine adsorption on Cu 61 , Ni 62 and Pt 63 where binding energies around 398-399 eV and 400 eV have been assigned to chemisorbed and weakly adsorbed states. A notable difference to the Pd-only deposition is the absence of the protonated pyridine signal at 401.5 eV 48,53,60 which means that the number of pyridine moieties exposed to the acidic electrolyte is below detection threshold and, therefore, the whole SAM is covered by metal.…”

Section: Resultssupporting

confidence: 83%

Coordination controlled electrodeposition and patterning of layers of palladium/copper nanoparticles on top of a self-assembled monolayer

et al. 2019

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Section: Resultssupporting

confidence: 83%

Coordination controlled electrodeposition and patterning of layers of palladium/copper nanoparticles on top of a self-assembled monolayer

et al. 2019

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“…For the structurally related molecules pyrrole and pyridine, upright standing surface species have been observed on Pt(111), previously. The latter forms a Pt‐bound α‐pyridyl.…”

Section: Resultsmentioning

confidence: 70%

“…For the structurally related moleculesp yrrole [21] and pyridine, [22] upright standing surface species have been observed on Pt(111), previously.T he latter forms aP t-bound a-pyridyl. The equivalent for indole would be a a-indolinidylidene (see Scheme1).…”

Section: Temperature-dependent Reaction Of Indole On Pt(111)mentioning

confidence: 82%

Model Catalytic Studies of Novel Liquid Organic Hydrogen Carriers: Indole, Indoline and Octahydroindole on Pt(111)

Schwarz

Bachmann

Silva

et al. 2017

Chemistry A European J

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Indole derivatives were recently proposed as potential liquid organic hydrogen carriers (LOHC) for storage of renewable energies. In this work, we have investigated the adsorption, dehydrogenation and degradation mechanisms in the indole/indoline/octahydroindole system on Pt(111). We have combined infrared reflection absorption spectroscopy (IRAS), X-ray photoelectron spectroscopy (XPS) and DFT calculations. Indole multilayers show a crystallization transition at 200 K, in which the molecules adopt a strongly tilted orientation, before the multilayer desorbs at 220 K. For indoline, a less pronounced restructuring transition occurs at 150 K and multilayer desorption is observed at 200 K. Octahydroindole multilayers desorb already at 185 K, without any indication for restructuring. Adsorbed monolayers of all three compounds are stable up to room temperature and undergo deprotonation at the NH bond above 300 K. For indoline, the reaction is followed by partial dehydrogenation at the 5-membered ring, leading to the formation of a flat-lying di-σ-indolide in the temperature range from 330-390 K. Noteworthy, the same surface intermediate is formed from indole. In contrast, the reaction of octahydroindole with Pt(111) leads to the formation of a different intermediate, which originates from partial dehydrogenation of the 6-membered ring. Above 390 K, all three compounds again form the same strongly dehydrogenated and partially decomposed surface species.

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“…Moreover, a very weak signal is found at 286.22 eV, which is tentatively assigned to a physisorbed species on top of the first chemisorbed layer. The growth of weakly adsorbed multilayers is very typical for molecular adsorbates; e.g., it has also been reported for the adsorption of pyridine on Pt(111) . In the N 1s region, the adsorption of BiPy at 130 K yields a signal at 398.12 eV, which is assigned to the two chemically equivalent nitrogen atoms.…”

Section: Resultsmentioning

confidence: 63%

“…The growth of weakly adsorbed multilayers is very typical for molecular adsorbates; e.g., it has also been reported for the adsorption of pyridine on Pt(111). 18 In the N 1s region, the adsorption of BiPy at 130 K yields a signal at 398.12 eV, which is assigned to the two chemically equivalent Subsequently, we performed TPXPS in both regions; that is, we heated the sample from 130 to 600 K with linear heating rates of 0.5 K/s while continuously recording XP spectra. The corresponding quantitative analysis is presented in Figure 3.…”

Section: Resultsmentioning

confidence: 99%

Model Catalytic Studies of the LOHC System 2,2′-Bipiperidine/2,2′-Bipyridine on Ni(111)

et al. 2021

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N-heterocyclic compounds such as octahydroindole and dodecahydro-N-ethylcarbazole have been proposed as suitable liquid organic hydrogen carriers for chemical hydrogen storage. Following these studies, we focused on hydrogen-rich 2,2′bipiperidine with a hydrogen storage capacity of 7.1 wt % and hydrogen-lean 2,2′-bipyridine. Both were adsorbed on Ni(111), and the temperature-induced reaction mechanism and decomposition were studied. The reaction was investigated using synchrotron-based XPS, NEXAFS, and TPD experiments. Upon adsorption, the formation of a flat-lying chemisorbed layer is observed. Above 370 K, 2,2′-bipyridine is dehydrogenated in the α-position to the nitrogen atoms to form an α-2,2′-bipyridyl species with a tilted adsorption geometry. The hydrogen-rich 2,2′bipiperidine is partially dehydrogenated above 180 K and deprotonated at the nitrogen atoms above 250 K. Above 320 K, α-2,2′bipyridyl is formed, which is accompanied by a byproduct that is partially dehydrogenated at the carbon atoms. Above 400 K, we observe the decomposition of the α-2,2′-bipyridyl species.

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Pyridine on flat Pt(111) and stepped Pt(355)—An in situ HRXPS investigation of adsorption and thermal evolution

Cited by 10 publications

References 32 publications

Coordination controlled electrodeposition and patterning of layers of palladium/copper nanoparticles on top of a self-assembled monolayer

Coordination controlled electrodeposition and patterning of layers of palladium/copper nanoparticles on top of a self-assembled monolayer

Model Catalytic Studies of Novel Liquid Organic Hydrogen Carriers: Indole, Indoline and Octahydroindole on Pt(111)

Model Catalytic Studies of the LOHC System 2,2′-Bipiperidine/2,2′-Bipyridine on Ni(111)

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