0000000001303521
AUTHOR
Michael Pfletscher
Hydrogen-bonded liquid crystals with broad-range blue phases
We report a modular supramolecular approach for the investigation of chirality induction in hydrogen-bonded liquid crystals. An exceptionally broad blue phase with a temperature range of 25 °C was found, which enabled its structural investigation by solid state 19F-NMR studies and allowed us to report order parameters of the blue phase I for the first time.
Improving the mesomorphic behaviour of supramolecular liquid crystals by resonance-assisted hydrogen bonding
A systematic structure-property relationship study on hydrogen-bonded liquid crystals was performed, revealing the impact of resonance-assisted hydrogen bonds (RAHBs) on the self-assembling behavior of the supramolecular architecture. The creation of a six-membered intramolecular hydrogen-bonded ring acts as a counterpart to the self-organization between hydrogen bond donators and acceptors and determines thus the suprastructure. Variation of the hydrogen-bonding pattern allowed us to significantly improve the temperature range of the reported liquid crystalline assemblies.
A modular approach towards functional supramolecular aggregates - subtle structural differences inducing liquid crystallinity.
Herein we report an efficient modular approach to supramolecular functional materials. Hierarchical self-assembly of azopyridine derivatives and hydrogen-bond donors yielded discotic assemblies. Subtle differences in the core units introduced mesomorphic behaviour and fast photo-response of the liquid crystals based on phloroglucinol. The presented results prove the benefits of a modular methodology towards highly responsive materials with tailor-made properties.
Photoresponsive Halogen-Bonded Liquid Crystals: The Role of Aromatic Fluorine Substitution
A new strategy for controlling the liquid crystalline and photophysical properties of supramolecular mesogens assembled via halogen bonding is reported. Changing the degree of fluorination at the halogen-bond donor of the supramolecular liquid crystal allows for the fine-tuning of the halogen bond strength and thereby provides control over the temperature range of the mesophase. At least three fluorine atoms have to be present to ensure efficient polarization of the halogen-bond donor and the formation of a mesophase. In addition, it was found that stilbazole acceptors are superior to their azopyridine counterparts in promoting stable liquid crystalline phases. The halogen-bond-driven supra…
On the impact of linking groups in hydrogen-bonded liquid crystals – a case study
The impact of the linking group in hydrogen-bonded liquid crystals is systematically studied by a modular approach. POM and DSC results exhibited tremendous differences in the mesomorphic behaviour of the assemblies, due to the versatile linkages of the side chains, which were correlated with structural features and the elctronical nature of the side chains.
CCDC 1866422: Experimental Crystal Structure Determination
Related Article: Marco Saccone, Matthias Spengler, Michael Pfletscher, Kim Kuntze, Matti Virkki, Christoph Wölper, Robert Gehrke, Georg Jansen, Pierangelo Metrangolo, Arri Priimagi, Michael Giese|2019|Chem.Mater.|31|462|doi:10.1021/acs.chemmater.8b04197
CCDC 1886744: Experimental Crystal Structure Determination
Related Article: Marco Saccone, Michael Pfletscher, Sven Kather, Christoph Wölper, Constantin Daniliuc, Markus Mezger, Michael Giese|2019|J.Mater.Chem.C|7|8643|doi:10.1039/C9TC02787D
CCDC 1866421: Experimental Crystal Structure Determination
Related Article: Marco Saccone, Matthias Spengler, Michael Pfletscher, Kim Kuntze, Matti Virkki, Christoph Wölper, Robert Gehrke, Georg Jansen, Pierangelo Metrangolo, Arri Priimagi, Michael Giese|2019|Chem.Mater.|31|462|doi:10.1021/acs.chemmater.8b04197
CCDC 1455700: Experimental Crystal Structure Determination
Related Article: Michael Pfletscher, Christoph Wölper, Jochen S. Gutmann, Markus Mezger, Michael Giese|2016|Chem.Commun.|52|8549|doi:10.1039/C6CC03966A
CCDC 1886743: Experimental Crystal Structure Determination
Related Article: Marco Saccone, Michael Pfletscher, Sven Kather, Christoph Wölper, Constantin Daniliuc, Markus Mezger, Michael Giese|2019|J.Mater.Chem.C|7|8643|doi:10.1039/C9TC02787D
CCDC 1866420: Experimental Crystal Structure Determination
Related Article: Marco Saccone, Matthias Spengler, Michael Pfletscher, Kim Kuntze, Matti Virkki, Christoph Wölper, Robert Gehrke, Georg Jansen, Pierangelo Metrangolo, Arri Priimagi, Michael Giese|2019|Chem.Mater.|31|462|doi:10.1021/acs.chemmater.8b04197
CCDC 1884535: Experimental Crystal Structure Determination
Related Article: Marco Saccone, Michael Pfletscher, Sven Kather, Christoph Wölper, Constantin Daniliuc, Markus Mezger, Michael Giese|2019|J.Mater.Chem.C|7|8643|doi:10.1039/C9TC02787D