Aktuelle Meldungen AG Winter

After a long break due to Covid, the Freiburger Inorganic Days were finally called back to life, with keynote lectures by professors from all over Germany. The Freiburger Inorganic Days additionally offered over 50 students the chance to present their research in the form of a poster.

This year, the annual "Koordinationschemie Treffen" took place in Innsbruck, offering over 70 doctorate students the possibility to present their research in the form of a presentation and over 100 students to present their work in the form of a poster.

This study presents dinuclear alkenylruthenium complexes featuring π-extended trans,trans-distyrylbenzene or 1,4-(2-phenylethynyl)benzene linkers, analogous to oligophenylvinylene and oligophenylethynylene oligomers, as well as the macrocyclic analogue. Characterized by NMR spectroscopy and high-resolution ESI-MS, the compounds undergo detailed examination of their electrochemical and spectroscopic properties. The study explores the efficacy of intramolecular through-bond electron transfer in…

The study introduces four diruthenium complexes featuring divinylphenylene-bridged structures with N,O-chelating 2-hydroxypyridine and 2-hydroxy- or 8-hydroxyquinoline ligands. Through a combination of experimental techniques and (TD-)DFT calculations, the research reveals that the divinylphenylene bridge significantly influences redox processes, showcasing electron delocalization over the entire π-conjugated backbone with minimal involvement of the attached donor ligands.

Franci's latest paper discusses PyrDPE-RuCl and PyrDPE-Ru(acac) complexes with a π-extended 2,7-di(4-phenylethynyl)pyrene linker, undergoing one-electron oxidations without displaying an intervalence charge-transfer band, suggesting a lack of electronic coupling between {Ru} entities. The electronically decoupled central pyrenyl fluorophore enables stable, red-shifted pyrene-based fluorescence emissions at 77 K, showcasing the unique electronic properties of these complexes.

Valence tautomerism involves the coexistence of redox isomers with different charge and spin density distributions, induced by intramolecular electron transfer and stimuli like light, X-ray, or temperature variations. This study proposes chromium half-sandwich complexes as alternatives, highlighting their advantages, including easily adjustable oxidation potentials, CO ligands for infrared spectroscopy, and EPR activity at a more convenient temperature (77 K) compared to ferrocene complexes.

In this study, we report the synthesis of a new bis-(alkenylruthenium) complex, DBTTF-(ViRu)2, featuring a longitudinally extended π-conjugated dibenzotetrathiafulvalene (DBTTF) bridge. The research extends the understanding of organometallic tetrathiafulvalene-based compounds and their electrochemical properties.

Lars' study introduces seven new ferrocenyl-modified N,N′,N″-triethyltriazatruxenes (EtTATs) and a dodecyl counterpart, demonstrating their utility as molecular switching units on an Ag(111) surface. These compounds offer a promising avenue for high-density information storage and processing. Voltammetric studies reveal that the ferrocenyl residues of these compounds oxidize prior to the TAT core, leading to multiple electronic excitations in the near-infrared and visible spectra. EtTAT and its…

Harnessing the unique properties of diradical species has been a long-standing challenge in the field of molecular electronics. In this paper, Moritz Nau unveils a strategy for enhancing the stability of a diradical ferrocenium thioxanthyl radical valence tautomer and effectively suppressing its dimerization, along with that of its one-electron reduced neutral radical counterpart.