A5101978620- Crystallization and Solubility Studies
- X-ray Diffraction in Crystallography
- CO2 Reduction Techniques and Catalysts
- Electrocatalysts for Energy Conversion
- Advanced battery technologies research
- Catalytic C–H Functionalization Methods
- Asymmetric Hydrogenation and Catalysis
- N-Heterocyclic Carbenes in Organic and Inorganic Chemistry
- Electrochemical Analysis and Applications
- Oxidative Organic Chemistry Reactions
- Cyclopropane Reaction Mechanisms
- Porphyrin and Phthalocyanine Chemistry
- Magnetism in coordination complexes
- Metal complexes synthesis and properties
- Electrochemical sensors and biosensors
- Surface Chemistry and Catalysis
- Molecular Junctions and Nanostructures
- Organometallic Complex Synthesis and Catalysis
- Polyoxometalates: Synthesis and Applications
- Nanomaterials for catalytic reactions
- Metal-Organic Frameworks: Synthesis and Applications
- Synthesis and Biological Evaluation
- Radical Photochemical Reactions
- Fluorine in Organic Chemistry
- Photochromic and Fluorescence Chemistry
University of Stuttgart
2020-2024
Ruhr University Bochum
2023-2024
Freie Universität Berlin
2020-2021
Institute of Inorganic Chemistry of the Slovak Academy of Sciences
2020
Stuttgart Observatory
2020
Indian Institute of Technology Bombay
2016-2017
University of Mumbai
2017
Renewable electricity-powered nitrate (NO3- ) reduction reaction (NO3 RR) offers a net-zero carbon route to the realization of high ammonia (NH3 productivity. However, this suffers from low energy efficiency (EE, with half-cell EE commonly <36%), since overpotentials are required overcome weak NO3- binding affinity and sluggish NO3 RR kinetics. To alleviate this, rational catalyst design strategy that involves linear assembly sub-5 nm Cu/Co nanophases into sub-20 thick nanoribbons is...
Abstract Oxidative transformations utilizing molecular oxygen (O 2 ) as the stoichiometric oxidant are of paramount importance in organic synthesis from ecological and economical perspectives. Alcohol oxidation reactions that employ O scarce homogeneous catalysis efficacy such systems has been constrained by limited substrate scope (most involve secondary alcohol oxidation) or practical factors, need for an excess base additive. Catalytic employing “primary” oxidant, absence any additive,...
A ligand controlled catalytic system for the aerobic oxidation of 1° amines to nitriles and imines has been developed where varying π-acidic feature BIAN <italic>versus</italic> phen in frameworks ruthenium catalysts facilitates switchable selectivity.
Abstract Reports on aerobic oxidation of amines to amides are rare, and those reported suffer from several limitations like poor yield or selectivity make use pure oxygen under elevated pressure. Herein, we report a practical an efficient ruthenium‐catalyzed synthetic protocol that enables selective broad range primary aliphatic, heterocyclic benzylic their corresponding amides, using readily available reagents ambient air as the sole oxidant. Secondary instead, benzamides selectively...
We report the synthesis of acyclic diaminocarbene (ADC)-scaffold based Thiele, Chichibabin, and Müller hydrocarbons. Studies support that singlet-triplet energy gap depends on π-conjugated spacer between ADC scaffolds.
Carbene-based radicals are important for both fundamental and applied chemical research. Herein, extensive electrochemical investigations of nine different 1,2,3-triazolylidene selenium adducts reported. It is found that the half-wave potentials first reduction selones correlate with their calculated LUMO levels corresponding triazolylidene-based mesoionic carbenes (MICs). Furthermore, unexpected quasi-reversibility two triazoline selones, exhibiting comparable potentials, was discovered....
Two Co(III) complexes (1Py2 and 2Py2) of new corrole ligands H3L1 (5,15-bis(p-methylcarboxyphenyl)-10-(o-methylcarboxyphenyl)corrole) H3L2 (5,15-bis(p-nitrophenyl)-10-(o-methylcarboxyphenyl)corrole) with two apical pyridine have been synthesized thoroughly characterized by cyclic voltammetry, UV–vis–NIR, EPR spectroscopy, spectroelectrochemistry, single-crystal X-ray diffraction studies, DFT methods. Complexes 1Py2 2Py2 possess much lower oxidation potentials than...
A bimetallic triply fused copper(II) porphyrin complex (1) was prepared, comprising two monomeric units linked through β-β, meso-meso, β'-β' triple covalent linkages and exhibiting remarkable catalytic activity for the electrochemical hydrogen evolution reaction in comparison to analogous (2). Electrochemical investigations presence of a proton source (trifluoroacetic acid) confirmed that metalloporphyrin occurred at significantly lower overpotential (≈320 mV) compared non-fused monomer....
Efficient and selective electrochemical oxidation of biomass-derived ethylene glycol to lactic acid is achieved over nickel catalyst by controlling the pH electrolyte solution.
A N-heterocyclic olefin (NHO), a terminal alkene selectively activates aromatic C-F bonds without the need of any additional catalyst. As result, straightforward methodology was developed for formation different fluoroaryl-substituted alkenes in which central carbon-carbon double bond is twisted geometry.
Abstract Electrochemical epoxidation of olefins using water as an oxygen atom source is emerging alternative approach for economic and sustainable method towards a highly selective synthesis epoxides. We report electrochemical procedure cyclooctene the sole over sodium dodecyl sulfonate (SDS) modified nickel hydroxide Ni(OH) 2 catalyst directly grown on Ni foam. The SDS modification facilitates mass transfer anode, thus achieving 2.5‐fold higher conversion with more than 90 % selectivity...
We propose a hybrid electrocatalytic-bioelectrocatalytic reaction cascade integrated on gas diffusion electrode for CO2 reduction under selective formation of methanol. Ag-Bi2O3 selectively reduces gaseous to formate at neutral pH conditions. A subsequent enzymatic comprising formaldehyde dehydro-genase and alcohol dehydrogenase, which are both nicotinamide adenine dinucleotide (NAD)-dependent, further reduce sequentially The enzymatically oxi-dized redox cofactor NAD+ is regenerated through...
Herein, we report the rational design, synthesis, and characterization of α,α'-diamino-substituted-p-quinodimethanes, which are a group partially substituted p-quinodimethanes. These exhibit two reversible one-electron redox steps electrochromism in ultraviolet, visible, near-infrared regions. We were able to isolate crystalline compounds all three oxidation states: neutral, radical cation, dication. The obtained results not only create bridge between p-quinodimethane...
The systematic combination of N-heterocyclic olefins (NHOs) with fluoroarenes resulted in twisted push–pull alkenes. These alkenes carry electron-donating cyclicdiamino substituents and two electron-withdrawing fluoroaryl the geminal positions. synthetic method can be extended to a variety substituted by varying NHO as well fluoroarenes. Solid-state molecular structures these molecules reveal notable elongation central C–C bond geometry alkene motif. Absorption properties were investigated...
Herein, we report diamidocarbene (DAC)-based Thiele and Tschitschibabin hydrocarbons, diradicaloids that contain four carbonyl/amido functional groups. The impact of two different π-conjugated spacers, p-phenylene vs p,p'-biphenylene, has been realized. quantum chemical calculations suggest hydrocarbon (p-phenylene bridged) closed-shell singlet is the ground state, whereas for (p,p'-biphenylene bridged), open-shell state. influence spacers also reflected in their UV-vis spectra. To gain more...
We report here nickel(II) complexes (Ni-1 and Ni-2) of triply fused (covalently linked through β–β, meso–meso, β′–β′ linkages) porphyrins functionalized with tert-butyl O-hexyl chains for the investigation electrocatalytic hydrogen evolution reaction (HER). The analogous monometallic Ni-3 Ni-4 were also synthesized comparative analysis. Cyclic voltammetry bimetallic showed an anodic shift in reduction potentials Ni-1. influence long alkyl was even more pronounced during electrochemical...
Slightly modified ligand designs in diruthenium setups have major impacts on the reactivity/stability of coordination complexes. The 1,2-bis(2-hydroxyphenyl)ethane-1,2-dione bridge is also potentially redox non-innocent.
Herein, we report the synthesis, characterization, and reactivity of α,α′-diamino-p-tetrafluoroquinodimethane, a p-tetrafluorophenylene-bridged monosubstituted carbene-based Thiele's hydrocarbon A. The compound exhibits reversible two-step one-electron oxidation with marginally stable radical cation state B. in situ formation could be confirmed by electron paramagnetic resonance spectroscopy. Interestingly, α,α′-diamino-p-tetrafluoroquinodimethane fixates atmospheric oxygen to form...
Bridging quinonoid ligands are important platforms for generating metal-based switchable optoelectronic and magnetic materials. A possible sound way of influencing the properties aforementioned materials is to modify direct metal-ligand interface. We present herein a series dinuclear RuII complexes where set donor atoms at bridging range from [O,O,O,O], [O,O,O,N], [O,N,O,N] [O,N,O,N']. Additionally, substituents on N-donors were varied as well (a total eight different bridges compared). also...
Palladium( ii )acetate is found to be an efficient catalyst for the single-step conversion of secondary propargyl alcohols 1,3-diarylpropanone derivatives under mild basic conditions.
Azocarboxamides, a special class of azo ligands, display intriguing electronic properties due to their versatile binding modes and coordination flexibility. These may have significant implications for use in homogeneous catalysis. In the present report, half-sandwich Ir–Cp* complexes two different azocarboxamide ligands are presented. Different motifs ligand were realized using base chloride abstracting give N∧N-, N∧O-, N∧C-chelated monomeric iridium complexes. For having methoxy substituted...
Highly symmetric enneanuclear copper(ii) phosphates [Cu9(Pz)6(μ-OH)3(μ3-OH)(ArOPO3)4(DMF)3] (PzH = pyrazole, Ar 2,6-(CHPh2)2-4-R-C6H2; R Me, 2MeAr; Et, 2EtAr; iPr, 2iPrAr; and 2,6-iPr2C6H3, 2Dip) comprising nine centers hydroxide DMF as ancillary ligands were synthesized by a reaction involving the arylphosphate monoester, 1, copper(i)chloride, triethylamine in 4 : 9 6 14 ratio. All four complexes characterized single crystal structural analysis. The contain two distinct motifs within...
2-Pyrrolidinyl appended trisubstituted geminal diazaalkenes were used for the synthesis of intramolecular base-stabilized dications under 2-e oxidation.