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Ultrathin Films of a Nitrile-Functionalized Ionic Liquid [CCNCIm][TfN] on Au(111) and Pt(111): Adsorption, Growth, and Thermal Behavior.
Langmuir
December 2024
Lehrstuhl für Physikalische Chemie 2, Friedrich-Alexander-Universität Erlangen-Nürnberg, Egerlandstr. 3, 91058 Erlangen, Germany.
We studied the adsorption and thermal behavior of the nitrile-functionalized ionic liquid (IL) [CCNCIm][TfN] on Au(111) and Pt(111) between 150 and 600 K. Ultrathin films were prepared at 150 K by physical vapor deposition (PVD) and were characterized by angle resolved X-ray photoelectron spectroscopy (ARXPS). At 150 K, the IL adsorbs intact with a similar orientation on both surfaces: In the first layer, the so-called wetting layer, the cation lies flat on the surface and the anion is bound in -configuration with the SO groups toward the surface and the CF groups away from the surface.
View Article and Find Full Text PDFThe emerging field of orbitronics aims to generate and control orbital angular momentum for information processing. Chiral crystals are promising orbitronic materials because they have been predicted to host monopole-like orbital textures, where the orbital angular momentum aligns isotropically with the electron's crystal momentum. However, such monopoles have not yet been directly observed in chiral crystals.
View Article and Find Full Text PDFA Surface-Active Pt(II) Bis-N-Heterocyclic Carbene (NHC) Complex for Interface-Enhanced Supported Ionic Liquid Phase (SILP) Catalysis.
Chemistry
January 2025
Department of Chemistry and Pharmacy, Inorganic Chemistry, Friedrich-Alexander-Universität Erlangen-Nürnberg (FAU), Egerlandstraße 1, 91058, Erlangen, Germany.
We present the preparation and investigation of a fluorine-free surface-active bis-N-heterocyclic carbene (NHC) platinum(II) complex - trans-[Pt(mPEGCIm)Cl] - for interface-enhanced supported ionic liquid phase (SILP) catalysis within a group of (mPEG)-substituted ionic liquids (ILs) ([(mPEG)Im][A] ILs). The complex was characterized by means of single-crystal X-ray diffraction (scXRD) analysis and multinuclear (H, C, Pt) NMR spectroscopy, indicating the presence of two almost equimolar syn-anti-rotamers of the square-planar complex in solution. Angle-resolved X-ray photoelectron spectroscopy (ARXPS) revealed pronounced interface-accumulation of trans-[Pt(mPEGCIm)Cl] in IL solutions of [(mPEG)Im][A] (A=I and PF ).
View Article and Find Full Text PDFWe propose a directionality orthogonal double-slit interferometry to control photoelectron dynamics in energy- and angle-resolved fashion. The two orthogonal components of polarization-skewed (PS) laser pulse, in which the total polarization vector rotates as time evolves, can be regarded as the double-slit in the time domain. Our results demonstrate that the peak splitting and shift in photoelectron momentum distributions can be controlled by the relative optical phase between two components of the PS pulse.
View Article and Find Full Text PDFArticle Synopsis
- The article details a newly designed laser source specifically for time- and angle-resolved photoemission spectroscopy (TR-ARPES) aimed at investigating electron dynamics in quantum materials.
- The laser system utilizes a combination of a ytterbium-doped laser, optical parametric amplifier (OPA), and difference frequency generation (DFG) to produce tunable near- and mid-infrared pulses, along with ultraviolet pulses for exciting materials like BiTe.
- The authors showcase the stability of the laser source and present initial TR-ARPES results, highlighting its effectiveness in studying electronic behaviors in topological insulators.
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