A5074118404- X-ray Diffraction in Crystallography
- Crystallization and Solubility Studies
- Supramolecular Chemistry and Complexes
- Molecular Sensors and Ion Detection
- Metal-Organic Frameworks: Synthesis and Applications
- Supramolecular Self-Assembly in Materials
- Crystallography and molecular interactions
- Luminescence and Fluorescent Materials
- Magnetism in coordination complexes
- Enzyme Structure and Function
- Metal complexes synthesis and properties
- Various Chemistry Research Topics
- Photochromic and Fluorescence Chemistry
- Analytical Chemistry and Sensors
- Airway Management and Intubation Techniques
- Porphyrin and Phthalocyanine Chemistry
- Pleural and Pulmonary Diseases
- Nanocluster Synthesis and Applications
- Chemical Synthesis and Reactions
- Crystal structures of chemical compounds
- CO2 Reduction Techniques and Catalysts
- bioluminescence and chemiluminescence research
- Surface Chemistry and Catalysis
- Polyoxometalates: Synthesis and Applications
- Molecular Junctions and Nanostructures
TU Dortmund University
2018-2024
Leiden University
2023-2024
Robert Bosch (Germany)
2021
University of Trieste
2019
University of Udine
2017
Chemists of all fields currently publish about 50 000 crystal structures per year, the vast majority which are X-ray structures. We determined two molecular by employing electron rather than diffraction. For this purpose, an EIGER hybrid pixel detector was fitted to a transmission microscope, yielding diffractometer. The structure new methylene blue derivative at 0.9 Å resolution from smaller 1×2 μm
Heteroleptic coordination cages, nonstatistically assembled from a set of matching ligands, can be obtained by mixing individual components or via cage-to-cage transformations homoleptic precursors. Based on the latter approach, we here describe new level self-sorting in cage systems, namely, 'heteromeric completive self-sorting'. Here, two heteroleptic assemblies type Pd2A2B2 and Pd2A2C2, sharing one common ligand component A but differing other, are shown to coexist solution. This reached...
Azulene, a blue structural isomer of naphthalene, is introduced as the backbone for new family Pd(II)-based self-assemblies. Three organic ligands, equipped with varying donor groups, produce three [Pd2L4] cages different cavity dimensions. Unexpectedly, addition disulfonate guests to smallest lantern-shaped cage (featuring pyridine donors) led rapid and quantitative transformation distorted-tetrahedral [Pd4L8] species. On contrary, formed from ligands isoquinoline donors either just...
Abstract A strategy to engineer the stacking of diketopyrrolopyrrole (DPP) dyes based on non‐statistical metallosupramolecular self‐assembly is introduced. For this, DPP backbone equipped with nitrogen‐based donors that allow for different discrete assemblies be formed upon addition Pd(II), distinguished by number π‐stacked chromophores. Pd 3 L 6 three‐ring, a heteroleptic 2 L′ ravel composed two crossing DPPs (flanked carbazoles), and unprecedented self‐penetrated motifs (a triple 4...
Abstract A series of metal‐mediated cages, having multiple cavities, was synthesized from Pd II cations and tris‐ or tetrakis‐monodentate bridging ligands characterized by NMR spectroscopy, mass spectrometry, X‐ray methods. The peanut‐shaped [Pd 3 L 1 4 ] cage deriving the tris‐monodentate ligand could be quantitatively converted into its interpenetrated [5Cl@Pd 6 8 dimer featuring a linear {[Pd‐Cl‐] 5 Pd} stack as an unprecedented structural motif upon addition chloride anions. Small‐angle...
A strategy to implement four members of the classic coal-tar dye family, Michler's ketone, methylene blue, rhodamine B, and crystal violet, into [Pd2 L4 ] self-assemblies is introduced. Chromophores were incorporated bis-monodentate ligands using piperazine linkers that allow retain auxochromic dialkyl amine functionalities required for intense colors deep in visible spectrum. Upon palladium coordination, with pyridine donors form lantern-shaped dinuclear cages while quinoline lead strongly...
Abstract Eine Reihe metallvermittelt gebildeter Käfige mit mehreren Kavitäten wurde unter Verwendung von Pd II ‐Kationen und drei‐ oder vierzähnigen Liganden synthetisiert mittels NMR‐Spektroskopie, Massenspektrometrie Einkristallröntgenstrukturanalyse charakterisiert. Der Erdnuss‐förmige [Pd 3 L 1 4 ]‐Käfig auf Basis des dreizähnigen konnte durch Versetzen einem Chlorid‐Salz quantitativ in das interpenetrierte [5Cl@Pd 6 8 ]‐Dimer umgewandelt werden, eine lineare {[Pd‐Cl‐] 5 Pd}‐Stapelung...
Abstract Derzeit publizieren Chemiker aller Fachrichtungen ca. 50 000 Kristallstrukturen pro Jahr, von denen es sich bei der überwältigenden Mehrheit um Röntgenstrukturen handelt. Wir setzen Elektronen‐ statt Röntgenbeugung ein, die Struktur zweier molekularer Verbindungen zu bestimmen. Zu diesem Zweck wurde ein EIGER‐Hybridpixeldetektor an Transmissionselektronenmikroskop angebaut und so Elektronendiffraktometer konstruiert. Die eines neuen Methylenblauderivates aus einem Kristall kleiner...
Abstract Wir berichten über den Einbau klassischer Teerfarben (Michlers Keton, Methylen Blau, Rhodamin B und Kristallviolett) in selbstassemblierte Strukturen der Formel [Pd 2 L 4 ]. Die Chromophore wurden unter Verwendung von Piperazin‐Linkern bis‐monodentate Liganden integriert. Dies erlaubt die Erhaltung für intensive Farbgebung verantwortlichen auxochromen Dialkylamin‐Funktionen. mit Pyridin‐Donoren bilden laternenförmige dinukleare Käfige, während Chinolin‐Donoren stark gewundene...
Abstract Es wird eine Strategie zur Stapelung von Diketopyrrolopyrrol‐Farbstoffen (DPP) vorgestellt, die auf einem nicht‐statistischen Ansatz metallosupramolekularen Selbstassemblierung beruht. Dazu das DPP‐Grundgerüst mit stickstoffbasierten Donoren ausgestattet, bei Zugabe Pd(II) Kationen Bildung verschiedener diskreter Strukturen ermöglichen, welche sich durch Anzahl der π‐gestapelten Chromophore unterscheiden. Ein Pd 3 L 6 ‐Dreiring, heteroleptische 2 L′ ‐Anordnung, bestehend aus zwei...
Peculiar hydrogen-bonded molecular chains are spontaneously created from the self-assembly on a gold surface of porphyrin functionalized with four aromatic amine moieties. The formed by sequence dyads, where same molecule behaves alternately as hydrogen-bond acceptor or donor whole at all its amino groups. This remarkable bifunctional behavior is due to conformational flexibility functionalizing groups that switch planar, aniline-like conformation in donors pyramidal, amine-like one...
Triplet–triplet annihilation upconversion is a bimolecular process converting low-energy photons into high-energy photons. Here, we report calcium-sensing system working via triplet–triplet (TTA) upconverted emission. The probe itself was obtained by covalent conjugation of blue emitter, perylene, with calcium-chelating moiety, and it sensitized the red-light-absorbing photosensitizer palladium(II) tetraphenyltetrabenzoporphyrin (PdTPTBP). Sensing selective for Ca2+ occurred in micromolar...
Abstract Organic chromophores have been successfully implemented into supramolecular systems to bestow them with distinct photophysical properties for various applications, ranging from solar energy conversion, photochemical reactions or as receptors guest molecules optical readout. We had previously introduced first members of the large family coal‐tar dyes (methylene blue, crystal violet and rhodamine) integral components coordination cages. Here, we add two new chromophores, malachite...
Triplet-triplet annihilation upconversion is a bimolecular process converting low-energy light into high-energy one. All available calcium probes, despite their qualities, are downconverting, which leads to the autofluorescence caused by background emission of intra- and intercellular molecules. Here we report calcium-sensing system working via upconverted emission. The probe itself was obtained covalent conjugation perylene blue emitter with calcium-chelating moiety; it sensitized red-light...
A strategy to engineer the stacking of diketopyrropyrrole (DPP) dyes based on non-statistical metallosupramolecular self-assembly is introduced. Therefore, DPP backbone equipped with nitrogenbased donors that allow for different discrete assemblies be formed upon addition Pd(II), distinguished by number π-stacked chromophores. Pd3L6 three-ring, a heteroleptic Pd2L2LL’2 ravel composed two crossing DPPs (flanked carbazoles), and unprecedented self-penetrated motifs (a Pd2L3 triple Pd2L4...