A5018524579- X-ray Diffraction in Crystallography
- Crystallization and Solubility Studies
- Metalloenzymes and iron-sulfur proteins
- Surface Modification and Superhydrophobicity
- Luminescence and Fluorescent Materials
- Electrocatalysts for Energy Conversion
- Photochromic and Fluorescence Chemistry
- Nanoplatforms for cancer theranostics
- Molecular Sensors and Ion Detection
- Oxidative Organic Chemistry Reactions
- Catalytic C–H Functionalization Methods
- Rheology and Fluid Dynamics Studies
- Porphyrin and Phthalocyanine Chemistry
- Advanced Sensor and Energy Harvesting Materials
- Pickering emulsions and particle stabilization
- Organic Electronics and Photovoltaics
- Synthesis and Biological Evaluation
- Cyclopropane Reaction Mechanisms
- Molecular Junctions and Nanostructures
- Polyoxometalates: Synthesis and Applications
- Polysaccharides Composition and Applications
- Adhesion, Friction, and Surface Interactions
- Surface Chemistry and Catalysis
- Nanocluster Synthesis and Applications
- Coordination Chemistry and Organometallics
Friedrich Schiller University Jena
2018-2024
Max Planck Institute for Polymer Research
2016-2023
University of Applied Sciences Mainz
2016
Abstract When a water drop is placed onto soft polymer network, wetting ridge develops at the periphery. The height of this typically governed by surface tension balanced elastic restoring forces network. However, situation more complex when network swollen with fluid, because fluid may separate from contact line. Here we study separation and deformation line polydimethylsiloxane (PDMS) silicone oil. By controlling both degrees crosslinking swelling, find that separates increasing swelling....
Drops in contact with swollen, elastomeric substrates can induce a capillary mediated phase separation wetting ridges. Using confocal microscopy, we visualize of oligomeric silicone oil from cross-linked network during steady-state sliding water drops. We find an inverse relationship between the tip height and drop speed, which is rationalized by competing transport timescales molecules: rate versus drop-advection speed. Separation rates highly swollen networks are as fast diffusion pure melts.
The nature of the bridging dithiolate has an important role on tuning physical and electrochemical properties synthetic H-cluster mimics [FeFe]-hydrogenase still significant concern to scientists. In this report we describe models active site containing perylene monoimide peri-substituted disulfides as linker. resulting complexes were characterized by 1H 13C{1H} NMR IR spectroscopic techniques, mass spectrometry, elemental analysis well X-ray complex 2a. purpose work was investigate...
A series of π-extended cycl[3,3,2]azines (3) bearing additional carbonyl groups were synthesized via aldol condensations. Two strong electron acceptor molecules (4 and 5), with low-lying LUMO energy levels −3.99 −3.95 eV, respectively, obtained. Organic thin-film transistors (TFTs) based on the cyanated cyclazine derivatives 5 fabricated by vapor deposition, exhibiting extraordinarily stable n-type semiconductor character under ambient condition highest mobility 0.06 cm2 V–1 s–1 consistently...
Abstract In this work, we present a new synthetic strategy for fourfold‐substituted perylene monoimides via tetrabrominated monoanhydrides. X‐ray diffraction analysis unveiled the intramolecular stacking orientation between substituents and semicircular packing behavior. We observed remarkable influence of substituent on longevity nature excited state upon visible light excitation. presence poly(dehydroalanine)‐graft‐poly(ethylene glycol) graft copolymers as solubilizing template,...
A useful and straightforward synthetic approach to afford heteroarenes by symmetrical annulation of two benzofuran units 1,8-naphthalene anhydrides, through a regioselective one-pot Sn–Ar/C–H activation tandem reaction is introduced herein. Two pathways are compared, highlighting that the utilization diester derivatives improves: (i) compatibility with key ring expansion step, (ii) solubility intermediate thus facilitating its purification, (iii) versatility final imidization. The...
In this study, we explore the untapped potential of ketocoumarins as photosensitizers for light driven hydrogen evolution.
Supramolecular dye structures, which are often ruled by π–π interactions between planar chromophores, crucially determine the optoelectronic properties of layers and interfaces. Here, we present interfacial assembly perylene monoanhydride monoimide that do not feature a chromophore but contain chlorine substituents in bay positions to yield twisted chromophores hence modified π-stacking. The is driven their amphiphilicity ensures proper Langmuir layer formation. shielding hydrophilic segment...
A facile and efficient synthesis of benzo[<italic>kl</italic>]acridines was developed based on a domino reaction <italic>via</italic> combinatorial catalyst approach.
A new set of perylene-based [Fe2S2(CO)6] photocatalyst dyads was synthesized and characterized. Four different strategies were employed to facilitate photoinduced electron transfer from the chromophore catalytically active site, increasing chance for successful photocatalytic proton reduction. X-ray photoelectron spectroscopy measurements demonstrated covalent attachment catalyst provided insights on oxidation states iron. Visible light absorption maxima presented complexes reached up 550 nm...
A new class of near-infrared (NIR) fluorophores, PAI, is obtained by consecutive C-N/C-C bond formation between diphenylamines and 9,10-dibromoperylenecarboximide. Owing to the rigid structure, extended π-conjugation pronounced push-pull substitution, these fluorophores show emission maxima up 804 nm large Stokes shifts. The extraordinarily high fluorescence quantum yields from 47 % 70 are attributed chloro substitution in bay positions perylene core. These characteristics, together with...
When drops are placed on a sufficiently soft surface, the drop surface tension drives an out of plane deformation around contact line (
Abstract A new class of near‐infrared (NIR) fluorophores, PAI , is obtained by consecutive C−N/C−C bond formation between diphenylamines and 9,10‐dibromoperylenecarboximide. Owing to the rigid structure, extended π‐conjugation pronounced push‐pull substitution, these fluorophores show emission maxima up 804 nm large Stokes shifts. The extraordinarily high fluorescence quantum yields from 47 % 70 are attributed chloro substitution in bay positions perylene core. These characteristics,...