Prof. Römelt erforscht die elektronische Struktur komplexer molekularer Systeme — insbesondere Metallkomplexe und Metalloxide — mit modernen computergestützten Methoden der Quantenchemie. Sein aktueller Fokus liegt auf der Beschreibung von Katalysatoren für CO₂-Reduktion, Wasserstoffproduktion und C-C-Kopplungsreaktionen sowie auf der Entwicklung effizienter Rechenmethoden für stark korrelierte Elektronensysteme. Für Industrie und öffentliche Hand relevant ist dies bei der Entwicklung von Katalysatoren für chemische Synthesen, Energiespeicherung und Umwandlungsprozesse — die Erkenntnisse ermöglichen es, katalytisch aktive Materialien am Computer zu modellieren und zu optimieren, bevor sie experimentell hergestellt werden.
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Prof. Dr. Michael Römelt
HU-FIS-Profil ↗Förderer: DFG Sachbeihilfe Zeitraum: 10/2021 - 09/2024 Projektleitung: Prof. Dr. Michael Römelt
Förderer: DFG Sachbeihilfe Zeitraum: 03/2022 - 07/2024 Projektleitung: Prof. Dr. Michael Römelt
Förderer: DFG Nachwuchsgruppe Zeitraum: 01/2023 - 12/2024 Projektleitung: Prof. Dr. Michael Römelt
Inorganic Chemistry · DOI
Five density functionals including GGA (generalized gradient approximation) (BP86), meta-GGA (TPSS), hybrid meta-GGA (TPSSh), hybrid (B3LYP), and double-hybrid functionals (B2PLYP) were calibrated for the prediction of 57Fe Mössbauer isomer shifts on a set of 20 iron-containing molecules. The influence of scalar relativistic effects and the basis set dependence of the predictions were investigated.
Chemical Science · DOI
The sterically encumbered 1,2,4-(Me3C)3C5H2 (Cp′) ligand allows the synthesis of stable high spin mono(cyclopentadienyl) manganese complexes [Cp′MnX(thf)]2 (X = Cl, Br, I; 1-X). Thermal stabilities of 1-X toward ligand redistribution to [Cp2′Mn] (2) and MnX2 depend on the bridging halide ligand. The kinetic stability of 1-I in solution even at elevated temperatures is noteworthy. Complexes 1 are useful starting materials for further functionalizations. Metathesis of 1-Cl with [LiN(SiMe3)2(OEt2)]2 yields the 13 valence-electron (VE) complex, [Cp′MnN(SiMe3)2] (3), while the manganese polyhydride cluster, [{Cp′Mn}4{MnH6}], was formed in the reaction of 1-I and KHBEt3. The 17 VE [MnH6]4− core of 4 is effectively shielded by four high spin [Cp′Mn]+ units. Magnetic susceptibility studies on 4 suggest weak electron exchange coupling between the spin carriers, but the spin state of the central [MnH6]4− fragment remained ambiguous. Therefore, the electronic structure of 4 was also analyzed by broken symmetry (BS) DFT calculations, which provided strong evidence for a low spin [MnH6]4− unit in agreement with previous spectrochemical studies performed on [FeH6]4−.
Chemical Science · DOI
production despite working in an acetonitrile/water (4 : 1) mixture. Experiments with mononuclear counterparts and computational studies show that the high activity can be attributed to synergistic catalysis between Cu and Co. Furthermore, it was shown that an increase of the metal distance results in the loss of synergistic effects and rather single-sited Co catalysis is observed.