Ralf Ludwig

19.8k total citations · 4 hit papers
381 papers, 17.1k citations indexed

About

Ralf Ludwig is a scholar working on Catalysis, Organic Chemistry and Atomic and Molecular Physics, and Optics. According to data from OpenAlex, Ralf Ludwig has authored 381 papers receiving a total of 17.1k indexed citations (citations by other indexed papers that have themselves been cited), including 159 papers in Catalysis, 81 papers in Organic Chemistry and 78 papers in Atomic and Molecular Physics, and Optics. Recurrent topics in Ralf Ludwig's work include Ionic liquids properties and applications (147 papers), Electrochemical Analysis and Applications (59 papers) and Spectroscopy and Quantum Chemical Studies (53 papers). Ralf Ludwig is often cited by papers focused on Ionic liquids properties and applications (147 papers), Electrochemical Analysis and Applications (59 papers) and Spectroscopy and Quantum Chemical Studies (53 papers). Ralf Ludwig collaborates with scholars based in Germany, United States and Pakistan. Ralf Ludwig's co-authors include Koichi Fumino, Alexander Wulf, Dietmar Paschek, Thorsten Köddermann, Matthias Beller, Frank Weinhold, Thomas C. Farrar, Henrik Junge, Peter Stange and Andreas Heintz and has published in prestigious journals such as Science, Journal of the American Chemical Society and Physical Review Letters.

In The Last Decade

Ralf Ludwig

373 papers receiving 16.9k citations

Hit Papers

align trajectories

What are hit papers?

Hit papers significantly outperform the citation benchmark for their cohort. A paper qualifies if it has ≥500 total citations, achieves ≥1.5× the top-1% citation threshold for papers in the same subfield and year (this is the minimum needed to enter the top 1%, not the average within it), or reaches the top citation threshold in at least one of its specific research topics.

Water: From Clusters to the Bulk

2001 1.0k citations Ralf Ludwig profile →
Water: From Clusters to the Bulk.

2001 1.0k citations Ralf Ludwig profile →
Efficient Dehydrogenation of Formic Acid Using an Iron Catalyst

2011 717 citations Ralf Ludwig et al. profile →
Selective Catalytic Hydrogenations of Nitriles, Ketones, and Aldehydes by Well-Defined Manganese Pincer Complexes

2016 509 citations Ralf Ludwig et al. profile →

Peers — A (Enhanced Table)

Peers by citation overlap · career bar shows stage (early→late) cites · hero ref

Name	h						Papers	Cites
Ralf Ludwig Germany	66	7.5k	4.2k	3.6k	3.3k	2.9k	381	17.1k
Barbara Kirchner Germany	61	7.4k 1.0×	2.9k 0.7×	2.7k 0.8×	1.3k 0.4×	2.9k 1.0×	267	13.8k
Seiji Tsuzuki Japan	66	4.9k 0.7×	4.5k 1.1×	3.4k 0.9×	1.8k 0.6×	3.6k 1.2×	341	17.5k
Yizhak Marcus Israel	66	2.5k 0.3×	5.2k 1.2×	6.4k 1.8×	2.5k 0.7×	5.4k 1.9×	357	24.1k
C. L. Reichardt Germany	43	2.0k 0.3×	8.2k 1.9×	6.6k 1.8×	934 0.3×	2.4k 0.8×	221	20.0k
Paul C. Redfern United States	50	2.2k 0.3×	7.5k 1.8×	6.8k 1.9×	2.0k 0.6×	7.6k 2.6×	117	20.8k
Georges Wipff France	50	1.7k 0.2×	2.5k 0.6×	2.5k 0.7×	2.9k 0.9×	1.6k 0.5×	226	8.7k
Patricia A. Hunt United Kingdom	42	4.5k 0.6×	1.8k 0.4×	1.2k 0.3×	568 0.2×	760 0.3×	83	6.9k
R. W. TAFT United States	38	1.5k 0.2×	10.2k 2.4×	4.6k 1.3×	1.9k 0.6×	2.3k 0.8×	98	19.1k
R. M. Lynden‐Bell United Kingdom	50	3.3k 0.4×	902 0.2×	2.1k 0.6×	345 0.1×	3.2k 1.1×	170	9.1k
Lars Goerigk Australia	35	2.5k 0.3×	8.8k 2.1×	12.1k 3.4×	5.7k 1.7×	7.0k 2.4×	76	29.8k

Countries citing papers authored by Ralf Ludwig

Since Specialization

Citations

This map shows the geographic impact of Ralf Ludwig's research. It shows the number of citations coming from papers published by authors working in each country. You can also color the map by specialization and compare the number of citations received by Ralf Ludwig with the expected number of citations based on a country's size and research output (numbers larger than one mean the country cites Ralf Ludwig more than expected).

Fields of papers citing papers by Ralf Ludwig

Since Specialization

Physical SciencesHealth SciencesLife SciencesSocial Sciences

This network shows the impact of papers produced by Ralf Ludwig. Nodes represent research fields, and links connect fields that are likely to share authors. Colored nodes show fields that tend to cite the papers produced by Ralf Ludwig. The network helps show where Ralf Ludwig may publish in the future.

Co-authorship network of co-authors of Ralf Ludwig

This figure shows the co-authorship network connecting the top 25 collaborators of Ralf Ludwig. A scholar is included among the top collaborators of Ralf Ludwig based on the total number of citations received by their joint publications. Widths of edges represent the number of papers authors have co-authored together. Node borders signify the number of papers an author published with Ralf Ludwig. Ralf Ludwig is excluded from the visualization to improve readability, since they are connected to all nodes in the network.

All Works

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20 of 20 papers shown

Khudozhitkov, Alexander E., Peter Stange, Alexander G. Stepanov, et al.. (2025). Dynamics, Phase Transitions, and Hydrogen Bonding Motifs in Protic Ionic Liquids: Cations Make the Difference. The Journal of Physical Chemistry B. 129(30). 7796–7805.

Sheikh, Nadeem S., et al.. (2023). Rational Design, Stabilities and Nonlinear Optical Properties of Non-Conventional Transition Metalides; New Entry into Nonlinear Optical Materials. Materials. 16(9). 3447–3447. 7 indexed citations

Niemann, Thomas, Jan Neumann, Peter Stange, et al.. (2023). Role of Hydrogen Bond Defects for Cluster Formation and Distribution in Ionic Liquids by Means of Neutron Diffraction and Molecular Dynamics Simulations. ChemPhysChem. 24(12). e202300031–e202300031. 5 indexed citations

Khudozhitkov, Alexander E., Alexander G. Stepanov, Daniil I. Kolokolov, & Ralf Ludwig. (2023). Ion Mobility in Hydroxy-Functionalized Ionic Liquids Depends on Cationic Clustering: Tracking the Alkyl Chain Length Behavior with Deuteron NMR Relaxation. The Journal of Physical Chemistry B. 127(43). 9336–9345. 5 indexed citations

Fritsch, Sebastian, et al.. (2022). Thermodynamically Stable Cationic Dimers in Carboxyl-Functionalized Ionic Liquids: The Paradoxical Case of “Anti-Electrostatic” Hydrogen Bonding. Molecules. 27(2). 366–366. 5 indexed citations

Khudozhitkov, Alexander E., Alexander G. Stepanov, Frederik Philippi, et al.. (2022). High‐Temperature Quantum Tunneling and Hydrogen Bonding Rearrangements Characterize the Solid‐Solid Phase Transitions in a Phosphonium‐Based Protic Ionic Liquid. Chemistry - A European Journal. 28(23). e202200257–e202200257. 2 indexed citations

Khudozhitkov, Alexander E., Peter Stange, Dietmar Paschek, et al.. (2022). The Influence of Deuterium Isotope Effects on Structural Rearrangements, Ensemble Equilibria, and Hydrogen Bonding in Protic Ionic Liquids. ChemPhysChem. 23(23). 2 indexed citations

Sarfaraz, Sehrish, Muhammad Yar, Muhammad Ans, et al.. (2022). Computational investigation of a covalent triazine framework (CTF-0) as an efficient electrochemical sensor. RSC Advances. 12(7). 3909–3923. 43 indexed citations

Zaitsau, Dzmitry H., et al.. (2022). Dissecting Noncovalent Interactions in Carboxyl‐Functionalized Ionic Liquids Exhibiting Double and Single Hydrogens Bonds Between Ions of Like Charge. Chemistry - A European Journal. 28(46). e202200949–e202200949. 7 indexed citations

10.

Fumino, Koichi, Peter Stange, Verlaine Fossog, et al.. (2021). Balance Between Contact and Solvent-Separated Ion Pairs in Mixtures of the Protic Ionic Liquid [Et₃NH][MeSO₃] with Water Controlled by Water Content and Temperature. The Journal of Physical Chemistry B. 125(17). 4476–4488. 16 indexed citations

11.

Menges, Fabian, et al.. (2020). 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. The Journal of Physical Chemistry Letters. 11(3). 683–688. 17 indexed citations

12.

Strate, Anne, Andreas Appelhagen, Esther Heid, et al.. (2020). Understanding the Nature of Nuclear Magnetic Resonance Relaxation by Means of Fast-Field-Cycling Relaxometry and Molecular Dynamics Simulations—The Validity of Relaxation Models. The Journal of Physical Chemistry Letters. 11(6). 2165–2170. 23 indexed citations

13.

Neumann, Jan, Dietmar Paschek, Anne Strate, & Ralf Ludwig. (2020). Kinetics of Hydrogen Bonding between Ions with Opposite and Like Charges in Hydroxyl-Functionalized Ionic Liquids. The Journal of Physical Chemistry B. 125(1). 281–286. 22 indexed citations

14.

Khudozhitkov, Alexander E., Peter Stange, Anne Strate, et al.. (2019). Simultaneous determination of deuteron quadrupole coupling constants and rotational correlation times: the model case of hydrogen bonded ionic liquids. Physical Chemistry Chemical Physics. 21(46). 25597–25605. 9 indexed citations

15.

Niemann, Thomas, Jan Neumann, Peter Stange, et al.. (2019). Die zweigesichtige Natur der Wasserstoffbrückenbindung in hydroxylfunktionalisierten ionischen Flüssigkeiten, offenbart durch Neutronendiffraktometrie und Molekulardynamik‐Simulation. Angewandte Chemie. 131(37). 13019–13024. 5 indexed citations

16.

Neumann, Jan, et al.. (2018). Revisiting imidazolium based ionic liquids: Effect of the conformation bias of the [NTf2] anion studied by molecular dynamics simulations. The Journal of Chemical Physics. 148(19). 193828–193828. 50 indexed citations

17.

Ali, Syed Abid, Iqra Munir, Khurshid Ayub, et al.. (2018). Acridinedione as selective flouride ion chemosensor: a detailed spectroscopic and quantum mechanical investigation. RSC Advances. 8(4). 1993–2003. 24 indexed citations

18.

Ludwig, Ralf, et al.. (2017). Utilization of the dye N-methyl-6-oxyquinolone as an optical acidometer in molecular solvents and protic ionic liquids. Chemical Communications. 53(78). 10761–10764. 8 indexed citations

19.

Perlt, Eva, Michael von Domaros, Barbara Kirchner, Ralf Ludwig, & Frank Weinhold. (2017). Predicting the Ionic Product of Water. Scientific Reports. 7(1). 10244–10244. 49 indexed citations

20.

Goharshadi, Elaheh K., et al.. (2016). Improving antibacterial activity of phosphomolybdic acid using graphene. Materials Chemistry and Physics. 188. 58–67. 45 indexed citations

Rankless uses publication and citation data sourced from OpenAlex, an open and comprehensive bibliographic database. While OpenAlex provides broad and valuable coverage of the global research landscape, it—like all bibliographic datasets—has inherent limitations. These include incomplete records, variations in author disambiguation, differences in journal indexing, and delays in data updates. As a result, some metrics and network relationships displayed in Rankless may not fully capture the entirety of a scholar's output or impact.

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