Kekulé-Institut für Organische Chemie und Biochemie

Aktueller Hinweis

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Foto Weynand.jpeg
© U. Weynand


Biochemie und Naturstoffe
Katalyse und nachhaltige Chemie
Neue Methoden in der Synthese
Organometallverbindungen in der Synthese
Organische Materialien
Supramolekulare Chemie und Sensoren

Nanoscale π-conjugated ladders

It is challenging to increase the rigidity of a macromolecule while maintaining solubility. Established strategies rely on templating by dendrons, or by encapsulation in macrocycles, and exploit supramolecular arrangements with limited robustness. Covalently bonded structures have entailed intramolecular coupling of units to resemble the structure of an alternating tread ladder with rungs composed of a covalent bond. We introduce a versatile concept of rigidification in which two rigid-rod polymer chains are repeatedly covalently associated along their contour by stiff molecular connectors. This approach yields almost perfect ladder structures with two well-defined π-conjugated rails and discretely spaced nanoscale rungs, easily visualized by scanning tunnelling microscopy. The enhancement of molecular rigidity is confirmed by the fluorescence depolarization dynamics and complemented by molecular-dynamics simulations. The covalent templating of the rods leads to self-rigidification that gives rise to intramolecular electronic coupling, enhancing excitonic coherence. The molecules are characterized by unprecedented excitonic mobility, giving rise to excitonic interactions on length scales exceeding 100 nm. Such interactions lead to deterministic single-photon emission from these giant rigid macromolecules, with potential implications for energy conversion in optoelectronic devices.

Subcomponent self-assembly of circular helical Dy6(L)6 and bipyramid Dy12(L)8 architectures

Subcomponent self-assembly gave access to Dy12(L)8 and Dy6(L)6 architectures via second-order template effects. The Dy6(L)6 assembly behaves as a single-molecule magnet exhibiting a high anisotropy barrier and butterfly-shaped magnetic hysteresis.

Structural Disorder as the Origin of Optical Properties and Spectral Dynamics in Squaraine Nano-Aggregates

In contrast to regular J- and H-aggregates, thin film squaraine aggregates usually have broad absorption spectra containing both J-and H-like features, which are favorable for organic photovoltaics. Despite being successfully applied in organic photovoltaics for years, a clear interpretation of these optical properties by relating them to specific excited states and an underlying aggregate structure has not been made. In this work, by static and transient absorption spectroscopy on aggregated n-butyl anilino squaraines, we provide evidence that both the red- and blue-shifted peaks can be explained by assuming an ensemble of aggregates with intermolecular dipole–dipole resonance interactions and structural disorder deriving from the four different nearest neighbor alignments - in sharp contrast to previous association of the peaks with intermolecular charge-transfer interactions. In our model, the next-nearest neighbor dipole-dipole interactions may be negative or positive, which leads to the occurrence of J- and H-like features in the absorption spectrum. Upon femtosecond pulse excitation of the aggregated sample, a transient absorption spectrum deviating from the absorbance spectrum emerges. The deviation finds its origin in the excitation of two-exciton states by the probe pulse. The lifetime of the exciton is confirmed by the band integral dynamics, featuring a single-exponential decay with a lifetime of 205 ps. Our results disclose the aggregated structure and the origin of red- and blue-shifted peaks and explain the absence of photoluminescence in squaraine thin films. Our findings underline the important role of structural disorder of molecular aggregates for photovoltaic applications.

A family of heterobimetallic cubes shows spin-crossover behaviour near room temperature

Starting from simple building blocks, six heterobimetallic cubes were obtained, following a straight-forward subcomponent self-assembly strategy. Three iron(II) based cages showed spin-crossover behaviour in solution. The crossover temperature was strongly dependent on interchangeable aldehyde components, giving rise to an efficient toolkit to manipulate magnetic behaviour.


GDCh Kolloquium - Professor Dr. Jieping Zhu
Chemische Institute - ...
17:00 - 18:00
Catalytic Enantioselective Pictet-Spengler Reaction of Ketones: Development and Applications in the Total Synthesis of Indole Alkaloids The asymmetric ...
GDCh Kolloquium - Junge Forscher stellen sich vor
Chemische Institute - ...
16:00 - 21:00
Stefan Flesch Photolytical formation of a nitrido-iron(V) complex tracked by ultrafast mid-IR spectroscopy Hagen Neugebauer Toward reliable quantum ...
Vorstellung der Wahlpflichtmodule (MSc Chemistry)
Gerhard-Domagk-Straße 1, ...
Studierende im Masterstudiengang Chemistry können ab dem zweiten Fachsemester aus einer Vielzahl von verschiedenen Wahlpflichtmodule wählen. Bei dieser ...



Jun. Prof. Dr. Bunescu
© A. Bunescu

Jun. Prof. Ala Bunescu

Transition Metal Catalysis
Organic Synthesis

© J. Dickschat

Prof. Dr. Jeroen Dickschat

Biosynthese, Synthese, Strukturaufklärung

© M. Engeser

PD Dr. Marianne Engeser


© Gansäuer

Prof. Dr. Andreas Gansäuer

Stereoselektive Synthese

© S. Höger

Prof. Dr. Sigurd Höger

Organische Chemie

© A. Lützen

Prof. Dr. Arne Lützen

Supramolekulare Chemie
Organische Synthese

© D. Menche

Prof. Dr. Dirk Menche                        

Charakterisierung, Totalsynthese,

© Jester

Dr. Stefan-Sven Jester

Supramolekulare Parkettierung von Oberflächen,

von Krbek
© L. von Krbek

Dr. Larissa von Krbek

Treibstoffgetriebene supramolekulare Systeme:
Synthese, Entwicklung und Untersuchung

Chemie im Nebenfach

Lehrveranstaltungen für Studierende der Humanmedizin, Zahnmedizin und Ernährungs- und Lebensmittelwissenschaften

Chemie für Mediziner und Zahnmediziner

Seminar, Vorlesung und Praktikum

Chemie für Ernährungs- und Lebensmittelwissenschaftler

Seminar, Vorlesung und Praktikum

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