A5009711653- X-ray Diffraction in Crystallography
- Crystallization and Solubility Studies
- Luminescence and Fluorescent Materials
- Radical Photochemical Reactions
- Porphyrin and Phthalocyanine Chemistry
- Organic Light-Emitting Diodes Research
- CO2 Reduction Techniques and Catalysts
- Molecular Sensors and Ion Detection
- Nanoplatforms for cancer theranostics
- Sulfur-Based Synthesis Techniques
- Advanced Photocatalysis Techniques
- Analytical Chemistry and Sensors
- Electrochemical sensors and biosensors
- Organoselenium and organotellurium chemistry
- Advanced Fiber Laser Technologies
- Advanced Chemical Sensor Technologies
- Nanocluster Synthesis and Applications
- Catalytic C–H Functionalization Methods
University of Freiburg
2023-2024
Technische Universität Braunschweig
2020
A convergent route toward nitrogen-bridged BODIPY oligomers has been developed. The synthetic key step is a Buchwald-Hartwig cross-coupling reaction of an α-amino-BODIPY and the respective halide. Not only does selective synthesis provide control oligomer size, but facile preparative procedure also enables easy access to these types dyes. Furthermore, functionalized examples were accessible via brominated derivatives.
The intra- and intermolecular synthesis of selenium-substituted acyclic heterocyclic acrylonitrile derivatives is presented. 1,2-difunctionalization several internal alkynes substituted not only by aliphatic aromatic residues but also heteroelements realized the Pd-catalyzed activation selenocyanates. A high functional group tolerance allows straightforward access to a broad scope tetrasubstituted olefins. X-ray studies some products reveal noncovalent chalcogen–chalcogen interactions...
Abstract We report a rapid, efficient, and scope‐extensive approach for the late‐stage electrochemical diselenation of BODIPYs. Photophysical analyses reveal red‐shifted absorption – corroborated by TD‐DFT DLPNO‐STEOM‐CCSD computations color‐tunable emission with large Stokes shifts in selenium‐containing derivatives compared to their precursors. In addition, due presence heavy Se atoms, competitive ISC generates triplet states which sensitize 1 O 2 display phosphorescence PMMA films at RT...
By combining the well-known motifs of BODIPY dyes and cycloparaphenylenes, novel nanohoop derivatives were accessible via established procedures. Absorption emission spectra showed overall bathochromic shifts, their photophysical behavior can be tuned by introducing steric demand to modulate conjugation throughout system. 19F NMR underline distinct differences in conformations, (TD)DFT calculations provide a deeper insight into geometry, behavior, influence demand.
A convergent route towards nitrogen-bridged BODIPY oligomers has been developed. The synthetic key step is a Buchwald-Hartwig cross-coupling reaction of an alpha-amino-BODIPY and the respective halide. Not only does selective synthesis provide control oligomer size, but facile preparative procedure also enables easy access to this type dyes. Furthermore, functionalized examples were accessible via brominated derivatives.
An established concept to create radical intermediates is photoexcitation of a catalyst higher energy intermediate, subsequently leading photoinduced electron transfer (PET) with reaction partner. The known consecutive (con‐PET) leads catalytically active species even in by the uptake two photons. Generally speaking, increased photon more potent reductant. Here, we report multi‐photoinduced catalysis (>2 photons), termed multi‐PET, which enabled one‐electron reductions an organic dye....
Abstract A new type of functionalized BODIPY dyes is described. Utilizing an established procedure for Buchwald–Hartwig reactions, we have been able to convert α-chloro BODIPYs α-azo-BODIPYs using phenylhydrazines. Optimization the reaction conditions and variation core phenylhydrazine were conducted. Absorption emission spectra recorded.
A facile access to N-heteroaryl-fused bis-BODIPY scaffolds has been developed. BODIPY dimer with an α,α-amine linker serves as a starting material obtain pyrrole- and pyridine-fused BODIPYs, either by direct oxidation or oxidative condensation aldehyde building block. Both species mark antipodal conjugative coupling conditions that result in distinct spectral outcomes. In stark contrast the pyrrole fusion, pyridine-coupled show unique panchromatic absorption profiles.
An established concept to create radical intermediates is photoexcitation of a catalyst higher energy intermediate, subsequently leading photoinduced electron transfer (PET) with reaction partner. The known consecutive (con‐PET) leads catalytically active species even in by the uptake two photons. Generally speaking, increased photon more potent reductant. Here, we report multi‐photoinduced catalysis (>2 photons), termed multi‐PET, which enabled one‐electron reductions an organic dye....
Invited for the cover of this issue are groups Holger Braunschweig at Julius-Maximilians-Universität Würzburg, Germany and Eufrânio N. da Silva Júnior Universidade Federal de Minas Gerais, UFMG, Brazil. The image depicts electrochemical synthesis selenium-containing BODIPY molecules with lightning symbolizing electrifying synthetic process, while surrounding elemental chaos hints red-shifted absorption emission transformative photophysical properties these new compounds. Read full text...