A5029501194- Supramolecular Chemistry and Complexes
- Molecular Sensors and Ion Detection
- Crystallization and Solubility Studies
- X-ray Diffraction in Crystallography
- Porphyrin and Phthalocyanine Chemistry
- Organic and Molecular Conductors Research
- Molecular Junctions and Nanostructures
- Surface Chemistry and Catalysis
- Photochromic and Fluorescence Chemistry
- Mass Spectrometry Techniques and Applications
- Analytical Chemistry and Chromatography
- Perovskite Materials and Applications
- Crystallography and molecular interactions
- Photoreceptor and optogenetics research
- Metabolomics and Mass Spectrometry Studies
- Magnetism in coordination complexes
- Analytical Chemistry and Sensors
- Luminescence and Fluorescent Materials
- Electrochemical Analysis and Applications
Freie Universität Berlin
2017-2024
Reversible redox-switching of a planar chiral [2]rotaxane with tetrathiafulvalene-bearing crown ether macrocycle generates complete sign reversal the main band in ECD spectrum, as shown by experiment and rationalised DFT calculations.
We report a quite flexible naphthol-based cage (so-called "naphthocage") which adopts self-inclusion conformation in its free state and is able to bind singly charged organic cations extremely strongly (Ka > 107 M–1). Ion-selective electrodes prepared with this naphthocage show super-Nernstian response acetylcholine. In addition, the highly stable complex (1010 M–1) between ferrocenium can be switched electrochemically, lays basis for application stimuli-responsive materials.
Abstract Donor–acceptor materials with small HOMO–LUMO gaps are important in molecular electronics, but often difficult to synthesise. A simple and efficient way position tetrathiafulvalene (TTF) as the donor naphthalene diamide (NDI) acceptor close proximity each other a divalent crown/ammonium pseudo[2]rotaxane is presented. The design provides high chelate cooperativity much stronger binding compared monovalent analogue. was then doubly interlocked by stoppering it catalyst‐free...
Switchable crown ether–ammonium [2]rotaxanes with a redox-active tetrathiafulvalene (TTF) unit implemented in their wheels were synthesised and fully characterised.
A redox-active [3]rotaxane is reported, in which wheel pirouetting motions can be synchronised by electrochemical switching.
The structural annotation of isomeric metabolites remains a key challenge in untargeted electrospray ionization/high-resolution mass spectrometry (ESI/HRMS) metabolomic analysis. Many are polyfunctional compounds that may form protomers ionization sources and therefore yield multiple peaks ion mobility spectra. Protomer formation is strongly structure-specific. Here, we explore the possibility using protomer for elucidation metabolomics on example caffeine, its eight metabolites,...
Molecular recognition of stable organic radicals is a relatively novel, but important structural binding motif in supramolecular chemistry. Here, we report on redox-switchable veratrole-fused tetrathiafulvalene derivative VTTF which ideally suited for this purpose and the incorporation into stimuli-responsive systems. As revealed by electrochemistry, UV/Vis measurements, X-ray analysis, electrocrystallisation, can be reversibly oxidised to corresponding radical-cation or dication shows...
Dual-stimuli pseudorotaxane switches: Threaded complexes dissociate upon deprotonation or oxidation. A mechanical bond changes the influence of a ‘speed bump’ on outcome switching event.
Programming the sequence of functional units in redox-switchable hetero[3]rotaxanes is achieved by integrative self-sorting for a library five crown ethers.
Abstract In nature, molecular environments in proteins can sterically protect and stabilize reactive species such as organic radicals through non-covalent interactions. Here, we report a near-infrared fluorescent rotaxane which the stabilization of chemically labile squaraine fluorophore by coordination tetralactam macrocycle be controlled electrochemically. The switched between two co-conformations wheel either stabilizes or exposes fluorophore. Coordination affects squaraine’s stability...
From a library of five crown ether macrocycles with different ring sizes and redox-active moieties, such as tetrathiafulvalene (TTF) naphthalene dimiide (NDI), directional heterocircuit[3]rotaxanes were constructed. Using an axle two binding sites steric accessibility, the concept integrative self-sorting was applied to program sequence functional units in heteropseudo[3]rotaxanes. Depending on strength size smaller macrocycles, heteropseudo[3]rotaxane selectivities stabilities determined by...
From a library of five crown ether macrocycles with different ring sizes and redox-active moieties, such as tetrathiafulvalene (TTF) naphthalene dimiide (NDI), directional heterocircuit[3]rotaxanes were constructed. Using an axle two binding sites steric accessibility, the concept integrative self-sorting was applied to program sequence functional units in heteropseudo[3]rotaxanes. Depending on strength size smaller macrocycles, heteropseudo[3]rotaxane selectivities stabilities determined by...
From a library of five crown ether macrocycles with different ring sizes and redox-active moieties, such as tetrathiafulvalene (TTF) naphthalene dimiide (NDI), directional heterocircuit[3]rotaxanes were constructed. Using an axle two binding sites steric accessibility, the concept integrative self-sorting was applied to program sequence functional units in heteropseudo[3]rotaxanes. Depending on strength size smaller macrocycles, heteropseudo[3]rotaxane selectivities stabilities determined by...
From a library of five crown ether macrocycles with different ring sizes and redox-active moieties, such as tetrathiafulvalene (TTF) naphthalene dimiide (NDI), directional heterocircuit[3]rotaxanes were constructed. Using an axle two binding sites steric accessibility, the concept integrative self-sorting was applied to program sequence functional units in heteropseudo[3]rotaxanes. Depending on strength size smaller macrocycles, heteropseudo[3]rotaxane selectivities stabilities determined by...