Prof. Dr. Kallol Ray

Profil

Zusammenfassung

Prof. Ray entwickelt und charakterisiert hochvalente Übergangsmetall-Komplexe, insbesondere Eisen- und Mangan-Oxo-Spezies, um zu verstehen, wie biologische Systeme schwierige Oxidationsreaktionen katalysieren. Seine Expertise liegt in der Synthese von biomimetischen Modellkomplexen und ihrer spektroskopischen sowie theoretischen Charakterisierung, um Erkenntnisse für die Entwicklung von katalytischen Prozessen zu gewinnen — etwa für Wasserspaltung, C-H-Aktivierung und Oxidationen mit günstigen, reichlich vorhandenen Metallen.

Skills

Name

Prof. Dr. Kallol Ray

Titel

Prof. Dr.

Fakultät

Mathematisch-Naturwissenschaftliche Fakultät

Institut

Institut für Chemie

Arbeitsgruppe

Geschäftsführendes Direktorat

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HU-FIS-Profil

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Zuletzt gescrapt

27.6.2026, 01:12:39

• Cluster/ NWG: Integrale Konzepte der Katalyse

  Quelle ↗

  Förderer: DFG Exzellenzinitiative Cluster Zeitraum: 11/2007 - 10/2012 Projektleitung: Prof. Dr. Kallol Ray

• Die Aufdeckung des photo-induzierten Assemblierungsmechanismus des lichtgetriebenen Wasseroxidationskomplexes in Photosystem II

  Quelle ↗

  Förderer: DFG Exzellenzinitiative Cluster Zeitraum: 11/2017 - 12/2018 Projektleitung: Prof. Dr. Athina Zouni

• Dioxygenase-Reaktivität von Hämoproteinen, die mit Nicht-Hem-Eisenkatalysatoren in asymmetrischen cis-Dihydroxylierungs- und Indol-Oxidationsreaktionen rekonstituiert wurden

  Quelle ↗

  Förderer: DFG Sachbeihilfe Internationale Kooperation Zeitraum: 06/2026 - 05/2029 Projektleitung: Prof. Dr. Kallol Ray

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• The biology and chemistry of high-valent iron–oxo and iron–nitrido complexes

  2012

  Nature Communications · 544 Zitationen · DOI

• Status of Reactive Non-Heme Metal–Oxygen Intermediates in Chemical and Enzymatic Reactions

  2014

  Journal of the American Chemical Society · 477 Zitationen · DOI

  Selective functionalization of unactivated C-H bonds, water oxidation, and dioxygen reduction are extremely important reactions in the context of finding energy carriers and conversion processes that are alternatives to the current fossil-based oil for energy. A range of metalloenzymes achieve these challenging tasks in biology by using cheap and abundant transition metals, such as iron, copper, and manganese. High-valent metal-oxo and metal-dioxygen (superoxo, peroxo, and hydroperoxo) cores act as active intermediates in many of these processes. The generation of well-described model compounds can provide vital insights into the mechanisms of such enzymatic reactions. This perspective provides a focused rather than comprehensive review of the recent advances in the chemistry of biomimetic high-valent metal-oxo and metal-dioxygen complexes, which can be related to our understanding of the biological systems.

• Axial ligand tuning of a nonheme iron(IV)–oxo unit for hydrogen atom abstraction

  2007

  Proceedings of the National Academy of Sciences · 407 Zitationen · DOI

  The reactivities of mononuclear nonheme iron(IV)-oxo complexes bearing different axial ligands, [Fe(IV)(O)(TMC)(X)](n+) [where TMC is 1,4,8,11-tetramethyl-1,4,8,11-tetraazacyclotetradecane and X is NCCH(3) (1-NCCH(3)), CF(3)COO(-) (1-OOCCF(3)), or N(3)(-) (1-N(3))], and [Fe(IV)(O)(TMCS)](+) (1'-SR) (where TMCS is 1-mercaptoethyl-4,8,11-trimethyl-1,4,8,11-tetraazacyclotetradecane), have been investigated with respect to oxo-transfer to PPh(3) and hydrogen atom abstraction from phenol O H and alkylaromatic C H bonds. These reactivities were significantly affected by the identity of the axial ligands, but the reactivity trends differed markedly. In the oxidation of PPh(3), the reactivity order of 1-NCCH(3) > 1-OOCCF(3) > 1-N(3) > 1'-SR was observed, reflecting a decrease in the electrophilicity of iron(IV)-oxo unit upon replacement of CH(3)CN with an anionic axial ligand. Surprisingly, the reactivity order was inverted in the oxidation of alkylaromatic C H and phenol O H bonds, i.e., 1'-SR > 1-N(3) > 1-OOCCF(3) > 1-NCCH(3). Furthermore, a good correlation was observed between the reactivities of iron(IV)-oxo species in H atom abstraction reactions and their reduction potentials, E(p,c), with the most reactive 1'-SR complex exhibiting the lowest potential. In other words, the more electron-donating the axial ligand is, the more reactive the iron(IV)-oxo species becomes in H atom abstraction. Quantum mechanical calculations show that a two-state reactivity model applies to this series of complexes, in which a triplet ground state and a nearby quintet excited-state both contribute to the reactivity of the complexes. The inverted reactivity order in H atom abstraction can be rationalized by a decreased triplet-quintet gap with the more electron-donating axial ligand, which increases the contribution of the much more reactive quintet state and enhances the overall reactivity.

• Charité – Universitätsmedizin Berlin

  EXC 2008: Unifying Systems in Catalysis (UniSysCat)

  university

• Freie Universität Berlin

  EXC 2008: Unifying Systems in Catalysis (UniSysCat)

  university

• Fritz-Haber-Institut der Max-Planck-Gesellschaft

  EXC 2008: Unifying Systems in Catalysis (UniSysCat)

  other