Browsing Fakultät für Chemie (inkl. GAUSS) by Referee "Siewert, Inke Prof. Dr."
Now showing items 1-20 of 29
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Transient Triplet Metallopnictinidenes
(2025-04-30)Nitrenes (N–R) are subvalent key intermediates in organic synthesis and have been extensively studied. The heavier pnictinidene analogues have also attracted great interest, but comprehensive investigations that systematically ... -
Cooperative Activation of Small Molecules on Preorganized Dinuclear Cobalt Complexes
(2025-03-14)The coordination chemistry of late-transition-metal dinitrogen complexes remains a topic of considerable interest. In this study, a pyrazolate-based dinucleating nacnac ligand was employed to construct a series of bimetallic ... -
Electron Rich Metallo Nitrene Complexes For Nitrogen Transfer
(2025-01-10)The advent of C–N bond formation by catalytic C–H amination had a huge impact on the synthesis of nitrogen-containing compounds, in academia as well as industry. In contrast to nitrogen-group transfer, complementary ... -
Femtosecond spectroscopy of charge-transfer dynamics in self-assembled Pd(II) based donor-acceptor/host-guest cages and heterobinuclear alkyne-bridged W(II)-Ru(II) and W(II)-Ir(III) complexes
(2024-04-11)Using femtosecond UV/vis-pump-UV/vis-probe and -midIR-probe absorption spectroscopy the charge-transfer dynamics of self-assembling donor-acceptor Pd(II) coordination cages and heterobinuclear alkyne-bridged W(II)-Ru(II) ... -
Exploiting the Disulfide/Thiol Switch for Photoinduced Proton-Coupled Multielectron Transfer Reactivity
(2024-03-27)Energy storage and efficient release has become a pivotal issue for our society relying progressively on renewable energy sources. The dichotomy between harvesting the sun’s energy in daylight hours, and requiring it the ... -
Local Orbital Analysis of Electronic Correlation in Molecular Systems
(2023-12-12)This thesis explores chemical problems through a combination of experiments and theoretical studies, leveraging advancements in computer hardware and quantum chemical algorithms to tackle challenges beyond the scope of ... -
Cobalt-Catalyzed Olefin Hydrogenation
(2023-08-04)This thesis describes the synthesis and isolation of the cobalt complexes, using PNP-pincer ligand system with tert-butyl substituents. The neutral and cationic cobalt hydrides were further probed in olefin hydrogenation ... -
New Synthetic Analogues for Biological Fe/S Clusters
(2023-03-20)Iron-sulfur (Fe/S) clusters are omnipresent and are essential components in virtually all life forms due to their versatile structures and functions. Biological systems extensively employ Fe/S clusters, especially with ... -
Tetradentate NHC/Thiolato and NHC/Alcoholato Hybrid Scaffolds – A Nickel(II) Complex as Bidentate Metalloligand in 3d Transition Metal Chemistry
(2023-03-08)Research and development of N-heterocyclic carbene (NHC)-based ligands has flourished in recent decades. Herein, The new bis-imidazolinium proligands were designed and synthesized to serve as tetradentate bis(NHC)-dithiolato ... -
Fixing the Conformation in Helicenes: Enantioselective Synthesis of [5]Helicenes and Synthesis of In-Fjord Substituted Expanded Helicenes
(2022-12-16)By combining the 3,3’-disubstituted BINOL-derived backbone and different cationic rests, a new family of α-cationic chiral phosphonites has been synthesized. Coordination to Au(I) afforded the corresponding precatalysts. ... -
Bioinspired Dinuclear Copper Complexes for Oxygen Activation
(2022-12-06)This thesis explores new bioinspired bimetallic copper complexes for the activation of dioxygen. Therefore, two novel TACN/pyrazolate ligand scaffolds with reduced steric hindrance were introduced and successfully established. ... -
Activation and transformation of small molecules at a bimetallic β-diketiminato nickel platform
(2022-03-25)This dissertation focuses on the activation and transformation of small molecules by a dinuclear nickel platform. A series of nickel-complexes based on a binucleating bis(tridentate) ligand that consists of two ß-diketiminato ... -
N2 Fixation by Chromium and Rhenium PNP Pincer Complexes
(2022-03-16)This thesis focusses on the activation and functionalization of atmospheric dinitrogen by chromium and rhenium based transition metal complexes. The electronic structure of dinitrogen bridged key species is discussed based ... -
Bioinspired Iron-Carbene Models of Heme and Non-Heme Enzymes: Electronic Structure and HAA Reactivity
(2022-03-15)The fast depletion of non-renewable energy sources requires modern chemists to develop new industrial processes that are more efficient and environmentally sustainable. In this framework, the functionalization (e.g. ... -
Molecular Ruthenium based Water Oxidation Catalysts and their Immobilization on Electrode Surfaces
(2022-02-11)Ruthenium complexes are valuable in the field of catalytic water oxidation. Their stability and molecular nature allow for detailed mechanistic insight, and they can be synthetically modified to enhance their activity. ... -
Bioinspired Dinuclear Copper Complexes for Small Molecule Activation
(2021-09-06)This thesis focuses on the activation of small molecules by dinuclear copper complexes. Initially, isolation of copper/oxygen intermediates on the basis of a non-symmetric pyrazolate/tacn scaffold was investigated. The ... -
Electrochemical N2-splitting and functionalisation in the coordination sphere of Rhenium
(2021-07-13)This thesis describes the exchange of stoichiometric, wasteful chemical redox-reagents with electrochemical activation methods within a rhenium-mediated N2-splitting and functionalisation cycle. After establishing ... -
Bioinspirierte Sauerstoffaktivierung an Bis(benzimidazolyl)basierten Kupfer(I)komplexen und Spektroskopische Studien an Bis(benzoxazolyl) Kupfer(II)-Verbindungen
(2021-05-04)The active sites of type III copper proteins (i.e. tyrosinase) provide inspiration for the development of copper complexes for the activation of O2 as well as for catalytic oxidation and oxygenation reactions of CH substrates. ... -
Transformations of Energy-Related Small Molecules at Dinuclear Complexes
(2021-02-05)The urgent need for the development of carbon-neutral energy conversion schemes has inspired chemists worldwide to investigate catalytic water splitting using sunlight as the energy source. A key component for the preparation ... -
Studies Toward Selenium-pi-Acid Catalyzed Oxidative Functionalizations of Olefinic and Acetylenic Multiple Bonds
(2020-09-24)The focus of this thesis was the oxidative functionalization of alkenes via selenium-pi-acid catalysis. In the realm of dual photoredox/selenium-pi-acid catalysis, the known methodology was expanded to the use of alcohols ...