Fakultät für Chemie (inkl. GAUSS): Recent submissions
Now showing items 1-20 of 714
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Manganese and Ruthenium Catalysis for Sustainable C–H Functionalizations and Polymer Synthesis
(2024-10-28)The ever-growing scarcity of resources, energy crises, and environmental pollution demand the development of sustainable chemical processes for C–C bond formations and efficient post-consumer plastic waste recycling. While ... -
3d-Metall-Käfig-Komplexe als Modelle für aktive Zentren von nicht-Häm Proteinen
(2024-10-22)This thesis presents a broad study on a new ligand system, specially designed for the mimicry of the quasi-chelating coordination by amino acid side chain residues in enzymatic pockets. The ligand system is based on an ... -
Mechanistic Studies on flat and stepped Palladium Single Crystal Surfaces: Experimental Evidence of Reaction Intermediates for the Decomposition of Formic Acid and Oxidation of Ammonia
(2024-10-04)In this work, experimental and theoretical investigations of formic acid desorption, decomposition and ammonia oxidation on single crystal palladium surfaces are presented. The formic acid system is investigated using a ... -
Metallaelectro-Catalysis and Aryl Sulfonium Salts in Sustainable C–H Activations and Late-Stage Diversification
(2024-09-17)In the past decades, organic chemistry was dominated by functional group interconversions and cross-coupling chemistry. These techniques allowed the synthesis of a plethora of highly complex molecules and are established ... -
Investigation of vibrational dynamics in alcohol-acid complexes and of monohydrates via FTIR and Raman spectroscopy
(2024-08-27)The vibrational dynamics of complexes between carboxylic acids with alcohols is investigated using Raman and FTIR jet spectroscopy combined with quantum chemical calculations. These complexes bind via intermolecular ... -
Enabling Novel Fluoroalkylation via Sulfonium Salt Transfer Reagents
(2024-08-26)Over the past four decades, sulfonium salt-based transfer reagents have evolved into widely recognized tools for fluoroalkylation in the synthetic chemistry community. These reagents have enabled the incorporation of various ... -
Development of Bone Adhesive Materials based on Collagen-mimetic Peptides and Carbene-mediated Diazirine Crosslinkers
(2024-08-22)Traditional mechanical fixation methods such as screws, support plates, staples, and sutures remain predominant in treating bone trauma. However, these methods can cause localized tissue damage, leading to infection and ... -
Selectivity controlling factors in the reductive elimination of coinage metal complexes
(2024-07-12)In this thesis, reductive elimination reactions and their selectivity-determining factors were investigated using ESI and tandem-MS. To this matter, square-planar coordinated coinage- metalate complexes bearing ... -
Synthesis of Novel Sulfur(VI) Reagents and the Regioselective Functionalization of Helicenes by Hypervalent Reagents
(2024-06-28)The synthesis of novel sulfur(VI) reagents was investigated. For this purpose different sulfurane oxides were synthesized. The functionalization of these compounds was unsuccessful due to decomposition or inertness of the ... -
Isomerization of CO on a NaCl(100) Surface: Evidence for Resonance Enhanced Quantum Tunneling in Condensed Phase
(2024-06-20)Carbon monoxide (CO) physisorbed on a NaCl(100) surface can undergo an isomerization reaction at cryogenic temperatures. In equilibrium conditions, the CO molecule absorbs on the surface with the C-atom closer to the Na+ ... -
meta-C−H Functionalization and Sustainable Electro- /Photoelectrocatalytic C−H/Si−H/Ge−H Activation
(2024-06-18)C−H activation provides a crucial new tool for the construction of C−C bonds in organic chemical synthesis, especially for agrochemistry, the pharmaceutical industry, and materials science, using a large number of existing ... -
Palladium- and Ruthenium-Catalyzed C(sp2)–H and C(sp3)–H Arylations
(2024-06-05)Catalysis is arguably the most impactful area of chemistry for society today, driven by the urgent need for highly efficient and environmentally benign reactions. C−H activation, which allows for the direct introduction ... -
Schwingungsspektroskopische Untersuchungen der Wasserstoffbrückendynamik in Alkohol-α-Hydroxyester-Komplexen aus topologischer und chiraler Perspektive
(2024-04-26)The success of an organocatalytic reaction in which the bond between substrate and catalyst is non-covalent, e.g. in the form of a hydrogen bond, is determined by the topology of the hydrogen bond in the prereactive complex. ... -
Electrochemical C–H Activation by Ruthenium and Palladium Catalysis
(2024-04-19)The emergence of direct functionalizations of C−H bonds offers efficient alternatives to traditional cross-coupling reactions, thereby saving time and costs. However, oxidative C−H activation often depends on stoichiometric ... -
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) ... -
Theoretical studies of metal-metal cooperativity in pyrazolate-bridged complexes
(2024-04-11)Transition metal complexes can play a variety of important roles in regard to catalysis, materials synthesis, photochemistry, and biological systems through use of their unique electronic structure, and the resulting ... -
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 ... -
Sustainable Ruthenium- and Rhodium-Catalyzed C−H Activations with Photochemistry and Electrochemistry
(2024-03-18)Cross-coupling chemistry stands out as a fundamental tool in synthetic organic chemistry for forging C‒C and C‒Het bonds. However, the necessity for substrate prefunctionalization imposes significant sustainability challenges ... -
Towards an Effective Synthesis of Functionalized Heptacyclo[6.6.0.02,6.03,13.04,11.05,9.010,14]tetradecane
(2024-03-14)A reassessment of the Rh-catalyzed dimerization of norbornadiene to generate heptacyclo[6.6.0.02,6.03,13.04,11.05,9.010,14]tetradecane (HCTD), a carbocyclic cage compound, has been conducted introducing novel π-acceptor ... -
Kinetics of free radical homo- and copolymerisations investigated with pulsed laser methods
(2024-03-06)Free-radical polymerisation is the most important polymerisation process due to its simplicity and robustness. It is therefore necessary to understand the kinetics of the involved reactions in order to plan a polymerisation, ...