Research interests:
- Infrared spectroscopy in near, mid and far IR-region
- NMR-spectroscopy
- Fast-Field-Cycling NMR relaxometry
- Molecular and ionic liquids
- Structure and dynamics of hydrogen bond systems
Projects:
DFG Research Grant (STR - 1626/2-1) - Entwicklung einer zuverlässigen Beschreibung der Rotations- und Translationsdynamik in ionischen Flüssigkeiten mittels Field Cycling und Hochfeld-NMR Relaxometrie sowie Molekulardynamischen Simulationen
Tasks:
- Scientific support for students in method and research internship and with scientific theses
- Leadership over the subgroup “Fast-Field-Cycling NMR Relaxometrie“ of Ludwig group
- Member of faculty council MNF
- Second in charge, responsible for evaluation of courses in MNF together with the dean of studies
- Course "Physical Chemistry I" for teaching students
- Teaching "Analytical Chemistry II" for teaching students
Publications
L. Al Sheakh, T. Niemann, A. Villinger, P. Stange, D. Zaitsau, A. Strate, R. Ludwig
Three in One: The Versatility of Hydrogen Bonding Interaction in Halide Salts with Hydroxy-Functionalized Pyridinium Cations
ChemPhysChem, 22, 1850-1856, 2021
J. Neumann, D. Paschek, A. Strate, R. Ludwig
Kinetics of Hydrogen Bonding between Ions with Opposite and Like Charges in Hydroxyl-Functionalized Ionic Liquids
J. Phys. Chem. B, 125, 1, 281–286, 2021
A. Strate, J. Neumann, T. Niemann, P. Stange, A. E. Khudozhitkov, A. G. Stepanov, D. Paschek, D. I. Kolokolov, R. Ludwig
Counting Cations Involved in Cationic Clusters of Hydroxy-Functionalized Ionic Liquids by Means of Infrared and Solid-State NMR Spectroscopy
Phys. Chem. Chem. Phys., 22, 6861-6867, 2020
P. Honegger, V. Overbeck, A. Strate, A. Appelhagen, M. Sappl, E. Heid, C. Schröder, R. Ludwig, O. Steinhauser
Understanding the Nature of Nuclear Magnetic Resonance Relaxation by Means of Fast-Field-Cycling Relaxometry and Molecular Dynamics Simulations - The Validity of Relaxation Models
J. Phys. Chem. Lett., 11, 2165-2170, 2020
T. Niemann, D. H. Zaitsau, A. Strate, P. Stange, R. Ludwig
Controlling "Like-Likes-Like" Charge Attraction in Hydroxy-Functionalized Ionic Liquids by Polarizability of the Cation, Interaction Strength of the Anions and Varying Alkyl Chain Length
Phys. Chem. Chem. Phys., 22, 2763-2774, 2020
H. J. Zeng, F. S. Menges, T. Niemann, A. Strate, R. Ludwig, M. A. Johnson
Chain Length Dependence of Hydrogen Bond Linkages Between Cationic Constituents in Hydroxy-Functionalized Ionic Liquids: Tracking Bulk Behavior to the Molecular Level with Cold Cluster Ion Spectroscopy
J. Phys. Chem. Lett., 11, 683-688, 2020
A. E. Khudozhitkov, V. Overbeck, P. Stange, A. Strate, D. Zaitsau, A. Appelhagen, D. Michalik, A. G. Stepanov, D. I. Kolokolov, D. Paschek, R. Ludwig
Simultaneous Determination of Deuteron Quadrupole Coupling Constants and Rotational Correlation Times: The Model Case of Hydrogen Bonded Ionic Liquids
Phys. Chem. Chem. Phys., 21, 25597-25605, 2019
D. H. Zaitsau, J. Neumann, T. Niemann, A. Strate, D. Paschek, S. P. Verevkin, R. Ludwig
Isolating the Role of Hydrogen Bonding in Hydroxyl-Functionalized Ionic Liquids by Means of Vaporization Enthalpies, Infrared Spectroscopy and Molecular Dynamics Simulations
Phys. Chem. Chem. Phys., 21, 20308-20314, 2019
T. Niemann, A. Strate, R. Ludwig, H. J. Zeng, F. S. Menges, M. A. Johnson
Cooperatively Enhanced Hydrogen Bonds in Ionic Liquids: Closing the Loop with Molecular Mimics of Hydroxy-Functionalized Cations
Phys. Chem. Chem. Phys., 21, 18092-18098, 2019
T. Niemann, P. Stange, A. Strate, R. Ludwig
When Hydrogen Bonding Overcomes Coulomb Repulsion: From Kinetic to Thermodynamic Stability of Cationic Dimers
Phys. Chem. Chem. Phys. 21, 8215-8220, 2019
T. Niemann, A. Strate, R. Ludwig, H. J. Zeng, F. S. Menges, M. A. Johnson
Spectroscopic Evidence of an Attractive Cation-Cation Interaction in Hydroxy-Functionalized Ionic Liquids: A Hydrogen-Bonded Chain-like Trimer
Angew. Chem., 130, 15590-15594, 2018
Angew. Chem. Int. Ed., 57, 15364-15368, 2018
T. Niemann, D. Zaitsau, A. Strate, A. Villinger, R. Ludwig
Cationic Clustering Influences the Phase Behaviour of Ionic Liquids
Sci. Rep., 8, 1-7, 2018
F. S. Menges, H. J. Zeng, T. Niemann, A. Strate, R. Ludwig, M. A. Johnson
Elucidating the Microscopic Mechanics of Attractive Cation-Cation Interactions in Hydroxylfunctionalized Ionic Liquids by Isomer-Selective Vibrational Spectroscopy of the N2-Tagged, Gas Phase (M+)2NTf2-Ternary Complexes
Abstracts of papers of the american chemical society, Volume 255, Meeting Abstract 293, 2018
255th National Meeting and Exposition of the American-Chemical-Society (CAS) - Nexus of food, energy, and water
F. S. Menges, H. J. Zeng, P. J. Kelleher, O. Gorlova, M. A. Johnson, T. Niemann, A. Strate, R. Ludwig
Structural Motifs in Cold Ternary Ion Complexes of Hydroxyl-Functionalized Ionic Liquids: Isolating the Role of Cation-Cation Interactions
J. Phys. Chem. Lett, 9, 2979-2984, 2018
T. Niemann, P. Stange, A. Strate, R. Ludwig
Like-likes-Like: Cooperative Hydrogen Bonding Overcomes Coulomb Repulsion in Cationic Clusters with Net Charges uo to Q=+6e
ChemPhysChem, 19, 1691-1695, 2018
A. Strate, J. Neumann, V. Overbeck, A.-M. Bonsa, D. Michalik, D. Paschek, R. Ludwig
Rotational and Translational Dynamics and Their Relation to Hydrogen Bond Lifetimes in an Ionic Liquid by Means of NMR Relaxation Time Experiments and Molecular Dynamics Simualtions
J. Chem. Phys., 148, 193843, 2018
A. Strate, V. Overbeck, V. Lehde, J. Neumann, A.-M. Bonsa, T. Niemann, D. Paschek, D. Michalik, R. Ludwig
The Influence of Like-Charge Attraction on the Structure and Dynamics of Ionic Liquids: NMR Chemical Shifts, Quadrupole Coupling Constants, Rotational Correlation Times and Failure of Stokes-Einstein-Debye
Phys. Chem. Chem. Phys., 20, 5617–5625, 2018
A. Strate, T. Niemann, R. Ludwig
Controlling the Kinetic and Thermodynamic Stability of Cationic Clusters by the Addition of Molecules or Counterions
Phys. Chem. Chem. Phys., 19, 18854-18862, 2017
A. Strate, T. Niemann, D. Michalik, R. Ludwig
When Like Charged Ions Attract in Ionic Liquids: Controlling the Formation of Cationic Clusters by the Interaction Strength of the Counterions
Angew. Chem., 129, 2, 510-514, 2017
Angew. Chem. Int. Ed., 56, 2, 496–500, 2017