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Faculty of Chemistry

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Clustomesogens are liquid crystalline hybrid materials containing anisometric transition metal cluster compounds. This class of nanomaterials discovered in Rennes in 2010 is now an integral part of liquid crystal nanoscience. In this work published in Angewandte Chemie on July 10th, alcali salts (K or Cs) of luminescent cluster compounds were synthesized by high temperature solid state chemistry and combined to crown-shaped organic discotic liquid crystals containing a 15C5 crown ether complexing center and flat aromatic peripheral units. The resulting hybrids are homogeneous and stable up to high temperature despite the weakness of the supramolecular interactions binding both components. All hybrids show hexagonal columnar arrangements and strong Red‐NIR emission. Surprisingly, when chlorinated clusters are used instead of brominated ones, the mesophase stability is largely enhanced. This work results from a fruitful collaboration partly financed by a DAAD-PHC Procope bilateral project between the University of Stuttgart (Department of organic chemistry, team of Prof. Sabine Laschat) and the University of Rennes (Institut des Sciences Chimiques de Rennes, Prof. Yann Molard and team CSM).

Publication by: Kevin Guy, Philipp Ehni, Serge Paofai, Claire Roiland, Maria Amela-Cortes, Stéphane Cordier, Sabine Laschat and Yann Molard

Angew. Chem. Int. Ed. 2018,
DOI: 10.1002/anie.201806556

For further information please contact:
Yann Molard
Institut des Sciences Chimiques de Rennes
E-Mail
Sabine Laschat
Institute of Organic Chemistry
University of Stuttgart
E-Mail

Financial support: PHC Procope “PLISE” n° 37689XA & ANR Clustomesogen ANR-13-BS07-0003-01

Soxazolinones are pharmacologically interesting densely functionalized heterocycles, which are usually difficult to produce in enantioenriched form by means of asymmetric catalysis. Moreover, the functionalization of isoxazolinones often suffers from a lack of regioselectivity. The Peters group has now reported the first enantioselective C-allylations of isoxazolinones. They proceeded with high regioselectivity favoring the linear allylation products, although Ir phosphoramidite catalysts were employed, which normally result in branched regioisomers in allylic substitutions. This investigation shows that the new reaction involves a cascade of steps including an initial regio- and enantioselective N-allylation giving a branched allyl intermediate, followed by a spontaneous [3,3]-rearrangement, which allows for a translocation of chirality.

Publication by: S. Rieckhoff, J. Meisner, J. Kästner, W. Frey, R. Peters

Angew. Chem. Int. Ed. 2018, 57, 1404–1408
https://doi.org/10.1063/1.5018928

For further information please contact
Prof. Dr. René Peters
Institute of Organic Chemistry
University of Stuttgart
E-Mail

Publication by: Taras Petrenko and Guntram Rauhut

J. Chem. Phys. 148, 054306, 2018
https://doi.org/10.1063/1.5018928

For further information please contact
Prof. Dr. Guntram Rauhut
Institute of Theoretical Chemistry
University of Stuttgart
E-Mail

Publication by: Stefan Kilper, Sandra J. Facey, Zaklina Burghard, Bernhard Hauer, Dirk Rothenstein,* and Joachim Bill

Adv. Funct. Mat. 2018
DOI: 10.1002/adfm.201705842

For further information please contact
Dr. Dirk Rothenstein
Institute of Material Science
University of Stuttgart
E-Mail

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