Formation and Surface Behavior of Pt and Pd Complexes with Ligand Systems Derived from Nitrile-functionalized Ionic Liquids Studied by XPS

Hemmeter D, Paap U, Taccardi N, Mehler J, Schulz P, Wasserscheid P, Maier F, Steinrück HP (2022)

Publication Type: Journal article

Publication year: 2022

Journal

DOI: 10.1002/cphc.202200391

Abstract

We studied the formation and surface behavior of Pt(II) and Pd(II) complexes with ligand systems derived from two nitrile-functionalized ionic liquids (ILs) in solution using angle-resolved X-ray photoelectron spectroscopy (ARXPS). These ligand systems enabled a high solubility of the metal complexes in IL solution. The complexes were prepared by simple ligand substitution under vacuum conditions in defined excess of the coordinating ILs, [C3CNC1Im][Tf2N] and [C1CNC1Pip][Tf2N], to immediately yield solutions of the final products. The ILs differ in the cationic head group and the chain length of the functionalized substituent. Our XPS measurements on the neat ILs gave insights in the electronic properties of the coordinating substituents revealing differences in donation capability and stability of the complexes. Investigations on the composition of the outermost surface layers using ARXPS revealed no surface affinity of the nitrile-functionalized chains in the neat ILs. Solutions of the formed complexes in the nitrile ILs showed homogeneous distribution of the solute at the surface with the heterocyclic moieties preferentially orientated towards the vacuum, while the metal centers are rather located further away from the IL/vacuum interface.

Authors with CRIS profile

Daniel Hemmeter Lehrstuhl für Physikalische Chemie II Ulrike Paap Lehrstuhl für Physikalische Chemie II Nicola Taccardi Lehrstuhl für Chemische Reaktionstechnik Julian Mehler Lehrstuhl für Chemische Reaktionstechnik Peter Schulz Lehrstuhl für Chemische Reaktionstechnik Peter Wasserscheid Lehrstuhl für Chemische Reaktionstechnik Florian Maier Lehrstuhl für Physikalische Chemie II Hans-Peter Steinrück Lehrstuhl für Physikalische Chemie II

How to cite

APA:

Hemmeter, D., Paap, U., Taccardi, N., Mehler, J., Schulz, P., Wasserscheid, P.,... Steinrück, H.-P. (2022). Formation and Surface Behavior of Pt and Pd Complexes with Ligand Systems Derived from Nitrile-functionalized Ionic Liquids Studied by XPS. ChemPhysChem. https://doi.org/10.1002/cphc.202200391

MLA:

Hemmeter, Daniel, et al. "Formation and Surface Behavior of Pt and Pd Complexes with Ligand Systems Derived from Nitrile-functionalized Ionic Liquids Studied by XPS." ChemPhysChem (2022).

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