Organic linkers on oxide surfaces: Adsorption and chemical bonding of phthalic anhydride on MgO(100)
| Autor: | Mathias Laurin, Ole Lytken, Tao Xu, Quratulain Tariq, Hans Peter Steinrueck, Susanne Mohr, Joerg Libuda, Tibor Doepper, Andreas Goerling |
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| Rok vydání: | 2016 |
| Předmět: |
Phthalic anhydride
Materials science Absorption spectroscopy Thermal desorption spectroscopy Inorganic chemistry Oxide 02 engineering and technology Surfaces and Interfaces 010402 general chemistry 021001 nanoscience & nanotechnology Condensed Matter Physics 01 natural sciences 0104 chemical sciences Surfaces Coatings and Films chemistry.chemical_compound Adsorption chemistry X-ray photoelectron spectroscopy Chemical engineering Physical vapor deposition Monolayer Materials Chemistry 0210 nano-technology |
| Zdroj: | Surface Science. 646:90-100 |
| ISSN: | 0039-6028 |
| Popis: | To elucidate the adsorption behavior and interaction mechanisms of organic linker units on oxide surfaces, we have performed a model study under ultrahigh vacuum (UHV) conditions. We apply infrared reflection absorption spectroscopy (IRAS) in combination with density-functional theory (DFT), temperature programmed desorption (TPD), and X-ray photoelectron spectroscopy (XPS). Phthalic anhydride (PAA) was deposited at temperatures between 100 and 300 K by physical vapor deposition (PVD) onto an ordered MgO(100) film grown on Ag(100). At 100 K, the first monolayer adsorbs molecularly with the molecular plane aligned parallel to the surface. Subsequent growth of a multilayer film at low temperature also occurs with preferential molecular alignment parallel to the surface. At 240 K, the multilayer desorbs without decomposition. At 300 K, a mixed monolayer of chemically modified ring-opened and intact phthalic anhydride exists on the surface. The chemically modified species binds in a strongly tilted geometry via opening of the anhydride ring to form a bis-carboxylate species. This species additionally stabilizes the coadsorbed molecular PAA via intermolecular interactions. Finally, surface defects and hydroxyl groups are found to increase the amount of surface bis-carboxylate at 300 K, whereas the relative amount of coadsorbed molecular PAA decreases. |
| Databáze: | OpenAIRE |
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