Humboldt-Universität zu Berlin - Mathematisch-Naturwissenschaftliche Fakultät - Arbeitsgruppe Ray

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1. "Axial Ligand Tuning of the Catalytic Two- versus Four-Electron Reduction of Dioxygen by a Dinuclear Cobalt Complex"
   A. Bera, X. Peng, D. J. Barman, M. Haumann, S. Katz, D. G.H. Hetterscheid, P. Hildebrandt, K. Ray, J. Am. Chem. Soc. 2026.
   DOI: 10.1021/jacs.6c12922
   
2. "An Acetyl-triggered Pentacarbonyl Chromium CORM for Redox-Responsive Hepatic Protection"
   X. Zhang, X. Zhang, Y. Wan, L. Yu, L. Hu, W.-Q. Zhang, B. Wang, K. Ray, Y.-M. Lee, W. Nam, Inorg. Chem. Front. 2026.
   DOI: 10.1039/D6QI01635A
3. "Janus Reactivity of a Mononuclear Non-Heme Iron(III)-Peroxo Complex Toward Indole Oxidation"
   W. Zhu, P. Wu, B. Wang, K. Ray, W. Nam, Angew. Chem. Int. Ed. 2026.
   DOI: 10.1002/anie.1874384
   
4. "Triazine-Directed Assembly of Tri- and Tetra-Ruthenium Carbonyl Clusters: Mechanistic Insights into C-C Coupling and Csp²-H Activation"
   W. Nam, Z. Gao, Y.-M. Lee, K. Ray, W.-Q. Zhang, Z. Xie, G. Zhang, H. Sun, M. Guo, A. Qasem, D. Lin, X. Zhang, Inorg. Chem. Front. 2026.
   DOI: 10.1039/D6QI01641C
   
 
5. "Dioxygen Reduction at a Cu(I) Complex Supported by a Macrocyclic N3O Ligand System"
   M. Schütze, D. J. Barman, C. Lorent, K. Ray, Chemistry – A European Journal 2026.
   DOI: 10.1002/chem.71479
   
6. "Hydrogen Bond Mediated Dioxygen Activation in a Manganese Guanidine Complex"
   M. Jux, K. Ray, Z. Anorg. Allg. Chem. 2026.
   DOI: 10.1002/zaac.70154
   
7. "A mononuclear nonheme iron complex with higher affinity for O₂ than CO via hydrogen bonding"
   M. Jux, S. Mebs, M. Haumann, S. Katz, R. Garcia-Serres, P. Hildebrandt, Y. Wang, W. Nam, K. Ray, Nat. Commun. 2026.
   DOI: 10.1038/s41467-026-72599-y
   
8. "Mononuclear Non-Heme Iron(III)-Peroxo Complexes in Oxidative N-Demethylation Reaction as a Chemical Model Study of Rieske Oxygenases"
   A. Zhou, V. Kardam, A. Kumar, W. Zhu, Y.-M. Lee, K.-B. Cho, K. Ray, S. Fukuzumi, W. Nam, J. Am. Chem. Soc. 2026.
   DOI: 10.1021/jacs.5c18643
   
9. "Ambiphilic Reactivity and Switchable Methyl Transfer at a T-Shaped Bi(NNN) Complex Enabled by a Redox-Active Pincer Ligand"
   S. Pavlidis, E. W. Fischer, A. Opis-Basilio, A. Bera, A. G. Buzanich, M. Álvarez-Sánchez, S. Wittek, F. Emmerling, K. Ray, M. Roemelt, J. Abbenseth, J. Am. Chem. Soc. 2026.
   DOI: 10.1021/jacs.5c18955
   
10. "Identifying an Active Intermediate and Monitoring O-O Bond Formation in Water Oxidation by a Cobalt(III)-TAML Complex"
    D. D. Malik, Y.-M. Lee, S. Fukuzumi, K. Ray, W. Nam, Angew. Chem. Int. Ed. 2025, e202516165.
    DOI: 10.1002/anie.202516165
    
11. "Light-induced surface defects in anodic TiO₂ nanotubes as trapping centers for single Pt atoms, a co-catalyst for enhanced photocatalytic hydrogen evolution"
    D. E. Szaniawska-Biatas, T. Schultz, A. Opis-Basilio, D. Zasada, N. Koch, K. Ray, N. Pinna, E. Wierzbicka, J. Mat. Chem. A 2025.
    DOI: 10.1039/D5TA06032J
    
12. "M(III) Site-Driven Structural Engineering on Lead-Free Layered Double Perovskite Nanocrystals with Enhanced Photoelectrochemical Activity"
    Yukta, S. Rahman, Q. Shi, T. Al Said, S. K. Matta, T. Hu, W. Wang, A. Opis-Basilio, K. Ray, K. A. Dick, T. Pulleritis, M. Liu, Small Struc. 2025, 2500179.
    DOI: 10.1002/sstr.202500179
    
13. "Generation and Nitric Oxide Reactivity of a Cobalt(II) Superoxide Complex via Ligand-Based Redox Non-Innocence"
    D. J. Barman, T. Lohmiller, K. Krause, S. Katz, M. Haumann, P. Hildebrandt, K. Ray, JACS Au 2025.
    DOI: 10.1021/jacsau.5c00418
    
14. "Mechanistic Promiscuity in Cobalt Mediated CO₂ Reduction Reaction: One- versus Two-Electron Reduction Process"
    A. Bera, S. Bimmermann, P. Gerschel, D. J. Barman, L. Gerndt, T. Lohmiller, K. Abdiaziz, A. Schnegg, M. Orio, D. G. H. Hetterscheid, K. L. Bren, M. Roemelt, U.-P. Apfel, K. Ray, Angew. Chem. Int. Ed. 2025, e202503705.
    DOI: 10.1002/anie.202503705
    
15. "Tuning Reactivity in Cu/TEMPO Catalyzed Alcohol Oxidation Reactions"
    M. Schütze, M. Jux, B. Cula, M. Haumann, S. Katz, P. Hildebrandt, H. Dau, K. Ray, Chem. Asian J. 2025, e202500123.
    DOI: 10.1002/asia.202500123
16. "Debate of Nucleophilic versus Electrophilic Oxidative Aldehyde Deformylation by Mononuclear Nonheme Iron(III)-Peroxo and Iron(IV)-Oxo Complexes"
    W. Zhu, D. Sun, A. Zhou, S. Wang, Y. Zhang, H. P. H. Wong, A. Kumar, X. Lu, P. Wu, S. S. Nag, Y. Wang, K. Ray, S. P. de Visser, W. Nam, J. Am. Chem. Soc. 2025.
    DOI: 10.1021/jacs.4c16522
17. "Effects of Concurrent Sulphur- and Phosphorus Incorporation in Nickel Cyclam-based Complexes"
    T. Guseva, A. Bera, V. Ludwig, D. Siegmund, P. Gerschel, K. Ray, U.-P. Apfel, Eur. J. Inorg. Chem. 2025, e202500094.
    DOI: 10.1002/ejic.202500094
18. "An Oxoiron (IV) Complex Supported by an N-alkylated Cyclam Ligand System Containing a Pendant Alcohol Moiety"
    D. J. Barman, T. Lohmiller, S. Katz, M. Haumann, P. Hildebrandt, W. Nam, K. Ray, Chem. Eur. J. 2025, e202404468.
    DOI: 10.1002/chem.202404468
    
19. "Reinvestigation of the mechanism of dioxygen activation at a Mn^II(cyclam) center"
    T. Devi, S. Mebs, D. J. Barman, A. Opis-Basilio, M. Haumann, K. Ray, J. Inorg. Biochem. 2025, 264, 112809.
    DOI: 10.1016/j.jinorgbio.2024.112809
20. "π-Lewis Base Activation of Carbonyls and Hexafluorobenzene"
    A. Mondal, K. Breitweiser, S. Danés, A. Grünwald, F. W. Heinemann, B. Morgenstern, F. Müller, M. Haumann, M. Schütze, D. Kass, K. Ray, D. Munz, Angew. Chem. Int. Ed. 2024, 137, e202418738.
    DOI: 10.1002/ange.202418738
    
21. "Unveiling the Spectroscopic Signatures of Poly(3,4-ethylendioxythiophene) by Controlling Polaron and Bipolaron Concentrations"
    R. Rubio-Govea, A. Opis-Basilio, A. Torres, M. Sánchez, K. Ray, K. A. Mazzio, J. Phys. Chem. C 2024.
    DOI: 10.1021/acs.jpcc.4c05602
22. "A bis-Phenolate Carbene-Supported bis-µ-Oxo Iron(IV/IV) Complex with a [Fe^IV(µ-O)₂Fe^IV] Diamond Core Derived from Dioxygen Activation"
    L. Gravogl, D. Kass, O. Pyschny, F. W. Heinemann, M. Haumann, S. Katz, P. Hildebrandt, H. Dau, A. Swain, R. García-Serres K. Ray, D. Munz, K. Meyer, J. Am. Chem. Soc. 2024.
    DOI: 10.1021/jacs.4c07582
23. "Investigation of m- and p-xylene linked bimetallic Ni-cyclam-complexes as potential electrocatalysts for the CO₂ reduction"
    S. Bimmermann, D. Siegmund, K. Ray, U.-P. Apfel, Mat. Tod. Cat. 2024, 6, 100058.
    DOI: 10.1016/j.mtcatav.2024.100058
24. "A Bioinspired Nonheme Fe^III-(O₂^2-)-Cu^II Complex with an S_t = 1 Ground State"
    D. Kass, S. Katz, H. Özgen, S. Mebs, M. Haumann, R. García-Serres, H. Dau, P. Hildebrandt, T. Lohmiller, K. Ray, J. Am. Chem. Soc. 2024.
    DOI: 10.1021/jacs.4c04492
25. "An Iminophosphinite Pincer Iridium Complex: Synthesis and Catalytic Tool for Alkane Transfer Dehydrogenations"
    J. Cardozo, O. He, W. Ma, K. Ray, T. Braun, Z. anorg. allg. Chem. 2024, e202400028.
    DOI: 10.1002/zaac.202400028
26. "Origin of Unprecedented Formation and Reactivity of Fe^IV=O Species viaOxygen Activation: Role of Noncovalent Interactions and Magnetic Coupling"
    A. Sen, N. J. Britto, D. Kass, K. Ray, G. Rajaraman, Inorg. Chem. 2024.
    DOI: 10.1021/acs.inorgchem.4c00371
27. "Identification, Characterization, and Electronic Structures of Interconvertible Cobalt-Oxygen TAML intermediates"
    D. D. Malik, W. Ryu, Y. Kim, G. Singh, J.-H. Kim, M. Sankaralingam, Y.-M. Lee, M. S. Seo, M. Sundararajan, D. Ocampo, M. Roemelt, K. Park, S. H. Kim, M.-H. Baik, J. Shearer, K. Ray, S. Fukuzumi, W. Nam, J. Am. Chem. Soc. 2024, 146, 13817-13835.
    DOI: 10.1021/jacs.3c14346
28. "Long-Term Stability of Light-Induced Ti³⁺ Defects in TiO₂ Nanotubes for Amplified Photoelectrochemical Water Splitting"
    E. Wierzbicka, E. Szaniawska-Bialas, T. Schultz, A. O. Basilio, D. Siemiaszko, K. Ray, N. Koch, N. Pinna, M. Polanski, ChemSusChem 2024, e202301614.
    DOI: 10.1002/cssc.202301614
29. "Trapping of a phenoxyl radical at a non-haem high-spin iron(II) centre"
    D. Kass, V. Larson, T. Corona, U. Kuhlmann, P. Hildebrandt, T. Lohmiller, E. Bill, N. Lehnert, K. Ray, Nat. Chem. 2024.
    DOI: 10.1038/s41557-023-01405-9
30. "A high-spin alkylperoxo-iron(III) complex with cis-anionic ligands: implications for the superoxide reductase mechanism"
    T. Devi, K. Dutta, J. Deutscher, S. Mebs, U. Kuhlmann, M. Haumann, B. Cula, H. Dau, P. Hildebrandt, K. Ray, Chem. Sci. 2024, 15, 528-533.
    DOI: 10.1039/D3SC05603
31. "How Ligand Geometry Affects the Reactivity ofCo(II) Cyclam Complexes"
    L. Iffland-Mühlhaus, B. Battistella, D. Siegmund, K. Ray, U.-P. Apfel, Eur. J. Inorg. Chem. 2023, 26, e202300418.
    DOI: 10.1002/ejic.202300418
32. "Reactivities of iron(IV)-oxido compounds with pentadentate bispidine ligands"
    K. Bleher, P. Comba, D. Kass, K. Ray, H. Wadepohl, J. Inorg. Biochem. 2023, 241, 112123.
    DOI: 10.1016/j.jinorgbio.2023.112123
33. "A New Thiolate-Bound Dimanganese Cluster as a Structural and Functional Model for Class Ib RNRs"
    B. Battistella, T. Lohmiller, B. Cula, P. Hildebrandt, U. Kuhlmann, H. Dau, S. Mebs, K. Ray, Angew. Chem. Int. Ed. 2023, 62, 202217076.
    DOI: 10.1002/anie.202217076
34. "Spectroscopic Properties of a Biologically Relevant [Fe₂(µ-O)₂] Diamond Core Motif with a Short Iron-Iron Distance"
    D. Kass, S. Yao, K. Krause, T. Corona, L. Richter, T. Braun, S. Mebs, M. Haumann, H. Dau, T. Lohmiller, C. Limberg, M. Drieß, K. Ray, Angew. Chem. Int. Ed. 2023, 62, e202209437.
    DOI: 10.1002/anie.202209437
35. "Evidence of Sulfur Non-Innocence in [Co^II(dithiacyclam)]²⁺-Mediated Catalytic Oxygen Reduction Reactions"
    B. Battistella, L. Iffland-Mühlhaus, M. Schütze, B. Cula, U. Kuhlmann, H. Dau, P. Hildebrandt, T. Lohmiller, S. Mebs, U.-P. Apfel, K. Ray, Angew. Chem. Int. Ed. 2022, e202214074.
    DOI: 10.1002/anie.202214074
36. "Modelling the coordination environment in α-ketoglutarate dependent oxygenases - a comparative study on the effect of N- vs. O-ligation"
    K. Warm, D. Kass, M. Haumann, H. Dau, K. Ray, Z. Anorg. Allg. Chem. 2022, 648, e202100310.
    DOI: 10.1002/zaac.202100310
37. "The influence of secondary interactions on the [Ni(O₂)]⁺ mediated aldehyde oxidation reactions"
    B. Battistella, K. Warm, B. Cula, B. Lu, P. Hildebrandt, U. Kuhlmann, H. Dau, S. Mebs, K. Ray, J. Inorg. Biochem. 2022, 227, 111668.
    DOI: 10.1016/j.jinorgbio.2021.111668
    
38. "Formation of cobalt-oxygen intermediates by dioxygen activation at a mononuclear nonheme cobalt(II) center"
    D. D. Malik, A. Chandra, M. S. Seo, Y.-M. Lee, E. R. Farquhar, S. Mebs, H. Dau, K. Ray, W. Nam, Dalton Trans. 2021, 50, 11889-11898.
    DOI: 10.1039/D1DT01996A
39. "Spectroscopic Characterization of a reactive [Cu₂(µ-OH)₂] intermediate in Cu/TEMPO catalyzed aerobic alcohol oxidation reaction"
    K. Warm, G. Tripodi, E. Andris, S. Mebs, U. Kuhlmann, H. Dau, P. Hildebrandt, J. Roithová, K. Ray, Angew. Chem. Int. Ed. 2021, 60, 23018-23024.
    DOI: 10.1002/anie.202108442
40. "Stable, but still reactive - investigations on the effects of Lewis acid binding on copper nitrene intermediates"
    K. Warm, I. Monte-Pérez, U. Kuhlmann, P. Hildebrandt, E. Farquhar, M. Swart, K. Ray, Z. Anorg. Allg. Chem. 2021, 647, 1495-1502.
    DOI: 10.1002/zaac.202100092
41. "Ligand Constraint Induced Peroxide Activation for Electrophilic Reactivity"
    A. Chandra, M. Ansari, I. Monte-Pérez, S. Kundu, G. Rajaraman, K. Ray, Angew. Chem. Int. Ed. 2021, 60, 14954-14959.
    DOI: 10.1002/anie.202100438
42. "Transition metal-mediated O-O bond formation and activation in chemistry and biology"
    X.-P. Zhang, A. Chandra, Y.-M. Lee, R. Cao, K. Ray, W. Nam, Chem. Soc. Rev. 2021, 50, 4804-4811.
    DOI: 10.1039/D0CS01456G
43. "A Bioinspired Oxoiron(IV) Motif Supported on a N₂S₂ Macrocyclic Ligand"
    J. Deutscher, P. Gerschel, K. Warm, U. Kuhlmann, S. Mebs, M. Haumann, H. Dau, P. Hildebrandt, U.-P. Apfel, K. Ray, Chem. Comm. 2021, 57, 2947-2950.
    DOI: 10.1039/D1CC00250C
44. "A Pseudotetrahedral Terminal Oxoiron(IV) Complex: Mechanistic Promiscuity in C-H bond Oxidation Reactions"
    K. Warm, A. Paskin, U. Kuhlmann, E. Bill, M. Swart, M. Haumann, H. Dau, P. Hildebrandt, K. Ray, Angew. Chem. Int. Ed. 2021, 60, 6752-6756.
    DOI: 10.1002/anie.202015896
45. "Synthesis, Characterization, and Reactivity of a Series of Homo- and Hetero-dinuclear Complexes based on an Asymmetric FloH Ligand System"
    B. Battistella, F. Heims, B. Cula, K. Ray, Z. Anorg. Allg. Chem. 2020, 646, 1010-1019.
    DOI: 10.1002/zaac.202000221
46. "Redox Potentials of High-Valent Iron-, Cobalt-, and Nickel-Oxido Complexes: Evidence for Exchange Enhanced Reactivity"
    P. Comba, A.-M. Löhr, F. Pfaff, K. Ray, Israel J. Chem. 2020, 60, 957-962.
    DOI: 10.1002/ijch.202000038
47. "Iron and manganese oxo complexes, the oxo wall and beyond"
    V. A. Larson, B. Battistella, K. Ray, N. Lehnert, W. Nam, Nature Rev. Chem. 2020, 4, 404-419.
    DOI: 10.1038/s41570-020-0197-9
48. "Electrochemical CO₂ Reduction - The Effect of Chalcogenide Exchange in Ni-Isocyclam Complexes"
    P. Gerschel, B. Battistella, D. Siegmund, K. Ray, U. P. Apfel, Organometall. 2020, 39, 1497-1510.
    DOI: 10.1021/acs.organomet.0c00129
49. "Catalytic dioxygen reduction mediated by a tetranuclear cobalt complex supported on a stannoxane core"
    A. Chandra, S. Mebs, S. Kundu, U. Kuhlmann, P. Hildebrandt, H. Dau, K. Ray, Dalton Trans. 2020, 49, 6065-6073.
    DOI: 10.1039/d0dt00475h
50. "O₂ and H₂O₂ activations at dinuclear Mn and Fe active sites"
    B. Battistella, K. Ray, Coord. Chem. Rev. 2020, 408, 213176.
    DOI: 10.1016/j.ccr.2019.213176
51. "Stoichiometric Formation of an Oxoiron(IV) Complex by a Soluble Methane Monooxygenase Type Activation of O₂ at an Iron(II)-Cyclam Center"
    D. Kass, T. Corona, K. Warm, B. Braun-Cula, U. Kuhlmann, E. Bill, S. Mebs, M. Swart, H. Dau, M. Haumann, P. Hildebrandt, K. Ray, J. Am. Chem. Soc. 2020, 142, 5924-5928.
    DOI: 10.1021/jacs.9b13756
52. "Trapping of a Highly Reactive Oxoiron(IV) Complex in the Catalytic Epoxidation of Olefins by Hydrogen Peroxide"
    X. Engelmann, D. D. Malik, T. Corona, K. Warm, E. R. Farquhar, M. Swart, W. Nam, K. Ray, Angew. Chem. Int. Ed. 2019, 131, 4052-4056.
    DOI: 10.1002/anie.201812758
53. "Sulfur substitution in a Ni(cyclam) derivative results in lower overpotential for CO₂ reduction and enhanced proton reduction"
    P. Gerschel, K. Warm, E. R. Farquhar, U. Englert, M. L. Reback, D. Siegmund, K. Ray, U.-P. Apfel, Dalton Trans. 2019, 48, 5923-5932.
    DOI: 10.1039/c8dt04740e
54. "Heme and Nonheme High-Valent Iron and Manganese Oxo Cores in Biological and Abiological Oxidation Reactions"
    M. Guo, T. Corona, K. Ray, W. Nam, ACS Cent. Scie. 2019, 5, 13-28.
    DOI: 10.1021/acscentsci.8b00698
55. "Water Oxidation Reaction Mediated by an Octanuclear Iron-Oxo Cluster"
    J. Deutscher, T. Corona, K. Warm, X. Engelmann, S. Sobottka, B. Braun-Cula, B. Sarkar, K. Ray, Eur. J. Inorg. Chem. 2018, 45, 4925–4929.
    DOI: 10.1002/ejic.201800269
56. "Structure, bonding, reactivity and spectral features of putative Ni^III=O species: a theoretical perspective"
    B. Pandey, K. Ray, G. Rajaraman, Z. Anorg. Allg. Chem. 2018, 644, 790-800.
    DOI: 10.1002/zaac.201800122
57. "Observation of Carbodicarbene Ligand Redox Noninnocence in Highly Oxidized Iron Complexes"
    S. C. Chan, P. Gupta, X. Engelmann, Z. Z. Ang, R. Ganguly, E. Bill, K. Ray, S. Ye, J. England, Angew. Chem. Int. Ed. 2018, 57, 1-7.
    DOI: 10.1002/anie.201809158
58. "Four-electron reduction of dioxygen to water by a trinuclear copper complex"
    X. Engelmann, E. R. Farquhar, J. England, K. Ray, Inorg. Chem. Acta 2018, 481, 159-165.
    DOI: 10.1016/j.ica.2017.11.014
59. "Nucleophilic vs. Electrophilic Reactivity of Bioinspired Superoxido Nickel(II) Complexes"
    C. Panda, A. Chandra, T. Corona, E. Andris, B. Pandey, S. Garai, N. Lindenmaier, S. Kuenstner, E. R. Farquhar, J. Roithova, G. Rajaraman, M. Driess, K. Ray, Angew. Chem. Int. Ed. 2018, 57, 14883-14887.
    DOI: 10.1002/anie.201808085
60. "C-H activation and nucleophilic substitution in a photochemically generated high valent iron complex"
    J. Hui Lim, X. Engelmann, S. Corby, R. Ganguly, K. Ray, H. S. Soo, Chem. Sci. 2018, 9, 3992-4002.
    DOI: 10.1039/C7SC05378A
61. "A Highly Reactive Oxoiron(IV) Complex Supported by a Bioinspired N3O Macrocyclic Ligand"
    I. Monte-Pérez, X. Engelmann, Y.-M. Lee, M. Yoo, K. Elumalai, E. R. Farquhar, E. Bill, J. England, W. Nam, M. Swart, K. Ray, Angew. Chem. Int. Ed. 2017, 56, 14384-14388.
    DOI: 10.1002/anie.201707872
62. "Temperature Dependence of the Catalytic Two- versus Four Electron Reduction of Dioxygen by a Hexanuclear Cobalt Complex"
    I. Monte-Pérez, S. Kundu, A. Chandra, K. E. Craigo, P. Chernev, U. Kuhlmann, H. Dau, P. Hildebrandt, C. Greco, C. Van Stappen, N. Lehnert, K. Ray, J. Am. Chem. Soc. 2017, 139, 15033-15042.
    DOI: 10.1021/jacs.7b07127
63. "A High-Valent Non-Heme μ-Oxo Manganese(IV) Dimer Generated from a Thiolate-Bound Manganese(II) Complex and Dioxygen"
    D. Brazzolotto, F. G. Cantú Reinhard, J. Smith-Jones, M. Retegan, L. Amidani, A. S. Faponle, K. Ray, C. Philouze, S. P. de Visser, M. Gennari, C. Duboc, Angew. Chem. Int. Ed. 2017, 56, 8211-8215.
    DOI: 10.1002/ange.201703215
64. "Synthesis and reactivity of a mononuclear non-haem cobalt(IV)-oxo complex"
    B. Wang, Y.-M. Lee, W.-Y. Tcho, S. Tussupbayev, S.-T. Kim, Y. Kim, M. S. Seo, K.-B. Cho, Y. Dede, B. C. Keegan, T. Ogura, S. H. Kim, T. Ohta, M.-H. Baik, K. Ray, J. Shearer, W. Nam, Nat. Commun. 2017, 8, 14839.
    DOI: 10.1038/ncomms14839
65. "A New Domain of Reactivity for High-Valent Dinuclear [M(µ-O₂M'] Complexes in Oxidation Reactions"
    X. Engelmann, S. Yao, E. R. Farquhar, T. Szilvási, U. Kuhlmann, P. Hildebrandt, M. Driess, K. Ray, Angew. Chem. 2017, 56, 303-307.
    DOI: 10.1002/anie.201607611
66. "Characterization and reactivity studies of a terminal copper-nitrene species"
    T. Corona, L. Ribas, M. Rovira, E. R. Farquhar, X. Ribas, K. Ray, A. Company, Angew. Chem. Int. Ed. 2016, 55, 14005-14008.
    DOI: 10.1002/anie.201607238
67. "A cobalt(II) iminoiodane complex and its scandium adduct: mechanistic promiscuity in hydrogen atom abstraction reactions"
    S. Kundu, P. Chernev, X. Engelmann, C. S. Chung, H. Dau, E. Bill, J. England, W. Nam, K. Ray, Dalton Trans. 2016, 45, 14538-14543.
    DOI: 10.1039/C6DT01815G
68. "Changing the chemical and physical properties of high valent heterobimetallic bis-(μ-oxido) Cu-Ni complexes by ligand effects"
    M.-C. Kafentzi, M. Orio, M. Reglier, S. Yao, U. Kuhlmann, P. Hildebrandt, M. Driess, A. J. Simaan, K. Ray, Dalton Trans. 2016, 45, 15994-16000.
    DOI: 10.1039/C6DT02391F
69. "Dioxygen activation chemistry by synthetic mononuclear nonheme iron, copper and chromium complexes"
    S. Hong, Y.-M. Lee, K. Ray, W. Nam, Coord. Chem. Rev. 2016, 334, 25-42.
    DOI: 10.1016/j.ccr.2016.07.006
70. "An iron(II) hydride complex of a ligand with two adjacent β-diketiminate binding sites and its reactivity"
    H. Gehring, R. Metzinger, B. Braun, C. Herwig, S. Harder, K. Ray, C. Limberg, Dalton Trans. 2016, 45, 2989-2996.
    DOI: 10.1039/C5DT04266F
71. "Oxidation Reactions with Bioinspired Mononuclear Non-Heme Metal-Oxo Complexes"X. Engelmann, I. Monte-Pérez, K. Ray, Angew. Chem. Int. Ed. 2016, 55, 7632-7649.
    DOI: 10.1002/anie.201600507
72. "High-Valent Metal-Oxo Intermediates in Energy Demanding Processes: From Dioxygen Reduction to Water Splitting"
    F. Heims, K. Ray, M. Schwalbe, W. Nam, Curr. Opin. Chem. Biol. 2015, 25, 159-171.
    DOI: 10.1016/j.cbpa.2015.01.014
73. "An Open-Shell Spin Singlet Copper-Nitrene Intermediate Binding Redox-innocent Metal Ions: Influence of the Lewis Acidity of the Metal Ions on Spectroscopic and Reactivity Properties"
    I. M.-Pérez, S. Kundu, K. Ray, Z. Anorg. Allg. Chem. 2015, 641, 78–82.
    DOI: 10.1002/zaac.201400389
74. "Characterization of Porphyrin-Co(III)-‘Nitrene radical’ species relevant in catalytic nitrene transfer reactions"
    M. Goswami, V. Lyaskovskyy, S. R. Domingos, W. J. Buma, S. Woutersen, O. Troeppner, I. I-Burmazović, H. Lu, X. Cui, P. Zhang, E. J. Reijerse, S. DeBeer, M. M. van Schooneveld, F. Pfaff, K. Ray, B. de Bruin, J. Am. Chem. Soc. 2015, 137, 5468–5479.
    DOI: 10.1021/jacs.5b01197
75. "Reactivity of a Nickel(II) Bis(amidate) Complex with meta-Chloroperbenzoic Acid: Formation of a Potent Oxidizing Species"
    T. Corona, F. F. Pfaff, F. Acuña-Parés, A. Draksharapu, C. J. Whiteoak, V. Martin-Diaconescu, J. L-Fillol, W. R. Browne, K. Ray, A. Company, Chem. Eur. J. 2015, 21, 15029-15038.
    DOI: 10.1002/chem.201501841
76. "[Ni(cod)₂][Al(OR^F)₄], a Source for Naked Nickel(I) Chemistry"
    M. Schwab, D. Himmel, S. Kacprzak, D. Kratzert, V. Radtke, M. Wernet, P. Weis, K. Ray, E. W. Scheidt, W. Scherer, B. de Bruin, T. Augenstein, F. Breher, S. Weber, I. Krossing, Angew. Chem. Int. Ed. 2015, 54, 14706-14709.
    DOI: 10.1002/anie.201506475
77. 
    S. Hong, F. F. Pfaff, E. Kwon, Y. Wang, M.-S. Seo, E. Bill, K. Ray, W. Nam, Angew. Chem. Int. Ed. 2014, 53, 10403-1407.
    DOI: 10.1002/ange.201701623
78. "Evidence of Two-State Reactivity in Alkane Hydroxylation by Lewis-acid Bound Copper-Nitrene Complexes"
    S.-L. Abram, I. Monte-Pérez, F. F. Pfaff, E. Farquhar, K. Ray, Chem. Commun. 2014, 50, 9852-9854.
    DOI: 10.1039/C4CC03754E
79. "Status of Reactive Non-Heme Metal-Oxygen Intermediates in Chemical and Enzymatic Reactions"
    K. Ray, F. F. Pfaff, B. Wang, W. Nam, J. Am. Chem. Soc. 2014, 136, 13942-13958.
    DOI: 10.1021/ja507807v
80. "Redox Non-Innocence of a N-Heterocyclic Nitrenium Cation Bound to a Nickel–Cyclam Core"
    F. Heims, F. F. Pfaff, S.-L. Abram, E. R. Farquhar, M. Bruschi, C. Greco, K. Ray, J. Am. Chem. Soc. 2014, 136, 582-585.
    DOI: 10.1021/ja4099559
81. "Mechanism of phenol oxidation by heterodinuclear Ni Cu bis(µ-oxo) complexes involving nucleophilic oxo groups"
    S. Kundu, E. Miceli, E. R. Farquharb, K. Ray, Dalton Trans. 2014, 43, 4264-4267.
    DOI: 10.1039/C3DT52644E
82. "Access to a Cu^II–O–Cu^II Motif: Spectroscopic Properties, Solution Structure, and Reactivity"
    P. Haack, A. Kärgel, C. Greco, J. Dokic, B. Braun, F. F. Pfaff, S. Mebs, K. Ray, C. Limberg, J. Am. Chem. Soc. 2013, 135, 16148-16160.
    DOI: 10.1021/ja406721a
83. "A High-Valent Heterobimetallic [Cu^III(μ-O)₂Ni^III]²⁺ Core with Nucleophilic Oxo Groups"
    S. Kundu, F. F. Pfaff, E. Miceli, I. Zaharieva, C. Herwig, S. Yao, E. R. Farquhar, U. Kuhlmann, E. Bill, P. Hildebrandt, M. Driess, C. Limberg, K. Ray, Angew. Chem. Int. Ed. 2013, 52, 5622-5626.
    DOI: 10.1002/anie.201300861
84. "Terminal oxo and imido transition metal complexes of Groups 9-11"
    K. Ray, F. Heims, F. F. Pfaff, Eur. J. Inorg. Chem. 2013, 2013, 3784-3807.
    DOI: 10.1002/ejic.201300223
85. "Nonheme oxoiron(IV) complexes of pentadentate N5 ligands: spectroscopy, electrochemistry, and oxidative reactivity"
    D. Wang, K. Ray, M. J. Collins, E. R. Farquhar, J. R. Frisch, L. Gomez, T. A. Jackson, M. Kerscher, A. Waleska, P. Comba, M. Costas, L. Que Jr., Chem. Sci. 2013, 4, 282-291.
    DOI: 10.1039/C2SC21318D
86. "Lewis-acid Trapping of an Elusive Copper-Tosylnitrene Intermediate Using Scandium Triflate"
    S. Kundu, E. Miceli, E. Farquhar, F. F. Pfaff, U. Kuhlmann, P. Hildebrandt, B. Braun, C. Greco, K. Ray, J. Am. Chem. Soc. 2012, 134, 14710-14713.
    DOI: 10.1021/ja306674h
87. "Metal-oxo-mediated O-O bond formation reactions in chemistry and biology"
    S. Kundu, M. Schwalbe, K. Ray, BioInorg. React. Mech. 2012, 8, 41-57.
    DOI: 10.1515/irm-2012-0004
88. "Synthesis and Spectroscopic Characterisation of a Heterodinuclear Iron(III)-Copper(II) Complex Based on an Asymmetric Dinucleating Ligand System"
    F. Heims, V. Mereacre, A. Ciancetta, S. Mebs, A. K. Powell, C. Greco, K. Ray, Eur. J. Inorg. Chem. 2012, 29, 4565-4569.
    DOI: 10.1002/ejic.201200156
89. "The biology and chemistry of high-valent iron–oxo and iron–nitrido complexes"
    J. Hohenberger, K. Ray, K. Meyer, Nature Commun. 2012, 3, 720.
    DOI: 10.1038/ncomms1718
90. "Spectroscopic capture and reactivity of S = 1/2 nickel(III)–oxygen intermediates in the reaction of a Ni^II-salt with mCPBA"
    
    F. F. Pfaff , F. Heims , S. Kundu , S. Mebs, K. Ray, Chem. Commun. 2012, 48, 3730-3732.
    DOI: 10.1039/C2CC30716B
91. "O-O Bond Formation Mediated by a Hexanuclear Iron Complex Supported on a Stannoxane Core"
    S. Kundu, E. Matito, S. Walleck, F. F. Pfaff, F. Heims, B. Rábay, J. M. Luis, A. Company, B. Braun, T. Glaser, K. Ray, Chem. Eur. J. 2012, 10, 2787-2791.
    DOI: 10.1002/chem.201102326
92. "An Oxocobalt(IV) Complex Stabilized by Lewis Acid Interactions with Scandium(III) Ions"
    F. F. Pfaff, S. Kundu, M. Risch, S. Pandian, F. Heims, I. Pryjomska-Ray, P. Haack, R. Metzinger, E. Bill, H. Dau, P. Comba, K. Ray, Angew. Chem. Int. Ed. 2011, 7, 1711-1715.
    DOI: 10.1002/anie.201005869
93. "Dinuclear Copper Complexes Based on Parallel ß-Diiminato Binding Sites and their Reactions with O₂: Evidence for a Cu-O-Cu Entity"
    P. Haack, C. Limberg, K. Ray, B. Braun, U. Kuhlmann, P. Hildebrandt, C. Herwig, Inorg. Chem. 2011, 6, 2133-2142.
    DOI: 10.1021/ic101249k
94. "Dioxygenase-Like Reactivity of an Isolable Superoxo-Nickel(II) Complex"
    
    A. Company, S. Yao, K. Ray, M. Driess, Chem. Eur. J. 2010, 16, 9669-9675.
    DOI: 10.1002/chem.201001138
95. "Determination by High-Frequency and -Field EPR of Zero-Field Splitting in Iron(IV) Oxo Complexes: Implications for Intermediates in Nonheme Iron Enzymes"
    J. Krzystek, J. England, K. Ray, A. Ozarowski, D. Smirnov, L. Que Jr., J. Telser, Inorg. Chem. 2008, 47, 3483-3485.
    DOI: 10.1021/ic800411c
96. "An Inverted and More Oxidizing Isomer of [Fe^IV(O)(TMC)(NCCH₃)]²⁺"
    K. Ray, J. England, M. Martinho, E. Munck, L. Que Jr., Angew. Chem. 2008, 120, 8188-8191.
    DOI: 10.1002/ange.200802219
97. "Iron-Oxidation-State Dependent O-O bond cleavage in meta-chloroperbenzoic acid to form an oxoiron(IV) complex"
    K. Ray, S. M. Lee, L. Que Jr., Inorg. Chim. Acta 2008, 361, 1066-1069.
    DOI: 10.1016/j.ica.2007.07.039
98. "Description of the Ground-State Covalencies of the Bis(dithiolato) Transition-Metal Complexes from X-ray Absorption Spectroscopy and Time-Dependent Density-Functional Calculations"
    K. Ray, S. D. George, E. I. Solomon, K. Wieghardt, F. Neese, Chem. Eur. J. 2007, 13, 2783-2797.
    DOI: 10.1002/chem.200601425
99. "Molecular and Electronic Structure of Square-Planar Gold Complexes Containing Two 1,2-Di(4-tert-butylphenyl)ethylene-1,2-dithiolato Ligands: [Au(²L)₂]^1+/0/1-/2-. A Combined Experimental and Computational Study"
    S. Kokatam, K. Ray, J. Pap, E. Bill, W. E. Geiger, R. J. LeSuer, P. H. Rieger, T. Weyhermüller, F. Neese, K. Wieghardt, Inorg. Chem. 2007, 46, 1100-1111.
    DOI: 10.1021/ic061181u
100. "Axial Ligand Tuning of a Nonheme Iron(IV)-Oxo Unit for Hydrogen Atom Abstraction"
     C. V. Sastri, J. Lee, K. Oh, Y. J. Lee, J. Lee, T. A. Jackson, K. Ray, H. Hirao, W. Shin, J. A. Halfen, L. Que Jr., S. Shaik, W. Nam, Proc. Natl. Acad. Sc. 2007, 104, 19181-19186.
     DOI: 10.1073/pnas.0709471104
101. "Joint Spectroscopic and Theoretical Investigations of Transition Metal Complexes Involving Non-innocent ligands"
     K. Ray, T. Petrenko, K. Wieghardt, F. Neese, Dalton Trans. 2007, 16, 1552-1566.
     DOI: 10.1039/B700096K
102. "Electrochemical Generation of a Nonheme Oxoiron(IV) Complex"
     M. J. Collins, K. Ray, L. Que Jr., Inorg. Chem. 2006, 45, 8009-8011.
     DOI: 10.1021/ic061263i
103. "Vibrational Markers for the Open-Shell Character of Transition Metal Bis-dithiolenes: An Infrared, Resonance Raman, and Quantum Chemical Study"
     T. Petrenko, K. Ray, K. Wieghardt, F. Neese, J. Am. Chem. Soc. 2006, 128, 4422-4436.
     DOI: 10.1021/ja0578451
104. "Molecular and Electronic Structures of Oxo-bis(benzene-1,2-dithiolato)chromate(V) Monoanions. A Combined Experimental and Density Functional Study"
     R. Kapre, K. Ray, I. Sylvestre, T. Weyhermüller, S. D. George, F. Neese, K. Wieghardt, Inorg. Chem. 2006, 45, 3499-3509.
     DOI: 10.1021/ic051844s
105. "A Lipophilic Hexaporphyrin Assembly Supported on a Stannoxane Core"
     V. Chandrasekhar, S. Nagendran, R. Azhakar, M. R. Kumar, A. Srinivasan, K. Ray, T. K. Chandrashekar, C. Madhavaiah, S. Verma, U. D. Priyakumar, G. N. Sastry, J. Am. Chem. Soc. 2005, 127, 2410-2411.
     DOI: 10.1021/ja043748g
106. "Electronic Structure of Square Planar Bis(benzene-1,2-dithiolato)metal Complexes [M(L)₂]^z (z = 2-, 1-, 0; M = Ni, Pd, Pt, Cu, Au): An Experimental, Density Functional, and Correlated ab initio Study"
     K. Ray, T. Weyhermüller, F. Neese, K. Wieghardt, Inorg. Chem. 2005, 44, 5345-5360.
     DOI: 10.1021/ic0507565
107. "Redox-Noninnocence of the S,S'-Coordinated Ligands in Bis(benzene-1,2-dithiolato)iron Complexes"
     K. Ray, E. Bill, T. Weyhermüller, K. Wieghardt, J. Am. Chem. Soc. 2005, 127, 5641-5654.
     DOI: 10.1021/ja040237l
108. "The Electronic Structure of the Isoelectronic, Square Planar Complexes, [Fe^II(L)₂]^2- and [Co^III(L^Bu)₂]^- (L^2- and (L^Bu)^2- = benzene-1,2-dithiolates): An Experimental and Density Functional Theoretical Study"
     K. Ray, A. Begum, T. Weyhermüller, S. Piligkos, J. van Slageren, F. Neese, K. Wieghardt, J. Am. Chem. Soc. 2005, 127, 4403-4415.
     DOI: 10.1021/ja042803i
109. "Molecular and Electronic Structure of Four- and Five- Coordinate Cobalt Complexes Containing Two o-Phenylenediamine- or two o-Aminophenol-Type Ligands at Various Oxidation Levels: An Experimental, Density Functional, and Correlated ab initio Study"
     E. Bill, E. Bothe, P. Chaudhuri, K. Chlopek, D. Herebian, S. Kokatam, K. Ray, T. Weyhermüller, F. Neese, K. Wieghardt, Chem. Eur. J. 2004, 11, 204-224.
     DOI: 10.1002/chem.200400850
110. "Do S,S'–Coordinated o-dithiobenzosemiquinonate(1-) Radicals Exist in Coordination Compounds? The [Au^III(1,2-C₆H₄S₂)₂]^1-/0 Couple"
     K. Ray, T. Weyhermüller, A. Goossens, M. W. J. Crajé, K. Wieghardt, Inorg. Chem. 2003, 42, 4082-4087.
     DOI: 10.1021/ic0207092