0000000000609331

AUTHOR

Michael Pfletscher

showing 12 related works from this author

Hydrogen-bonded liquid crystals with broad-range blue phases

2019

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.

Range (particle radiation)Materials scienceHydrogenChemieSupramolecular chemistrySolid-statechemistry.chemical_element02 engineering and technologyGeneral ChemistryAtmospheric temperature range010402 general chemistry021001 nanoscience & nanotechnology01 natural sciencesLiquid Crystals Hydrogen Bonding Blue Phases Fluorine Supramolecular Chemistry0104 chemical sciencesCrystallographychemistryLiquid crystalPhase (matter)Materials ChemistrySettore CHIM/07 - Fondamenti Chimici Delle Tecnologie0210 nano-technologyChirality (chemistry)
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Improving the mesomorphic behaviour of supramolecular liquid crystals by resonance-assisted hydrogen bonding

2019

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.

Materials scienceLiquid crystallineHydrogen bondChemieSupramolecular chemistry02 engineering and technologyGeneral ChemistryAtmospheric temperature range010402 general chemistry021001 nanoscience & nanotechnologyRing (chemistry)Resonance (chemistry)01 natural sciences0104 chemical sciencesCrystallographyLiquid Crystals Hydrogen Bonding Structure-Property Supramolecular Chemistry intramolecularLiquid crystalIntramolecular forceMaterials ChemistrySettore CHIM/07 - Fondamenti Chimici Delle Tecnologie0210 nano-technologyJournal of Materials Chemistry C
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A modular approach towards functional supramolecular aggregates - subtle structural differences inducing liquid crystallinity.

2016

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.

Materials sciencebusiness.industryChemieMetals and AlloysSupramolecular chemistryNanotechnology02 engineering and technologyGeneral ChemistryModular design010402 general chemistry021001 nanoscience & nanotechnology01 natural sciencesCatalysis0104 chemical sciencesSurfaces Coatings and FilmsElectronic Optical and Magnetic MaterialsCrystallinityLiquid crystalMaterials ChemistryCeramics and Composites0210 nano-technologybusinessChemical communications (Cambridge, England)
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Photoresponsive Halogen-Bonded Liquid Crystals: The Role of Aromatic Fluorine Substitution

2019

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…

Materials scienceHalogen bondPhotoisomerizationGeneral Chemical EngineeringSupramolecular chemistryChemiechemistry.chemical_elementMesophase02 engineering and technologyGeneral Chemistry010402 general chemistry021001 nanoscience & nanotechnologyPhotochemistry01 natural sciences0104 chemical scienceschemistry.chemical_compoundAzobenzenechemistryLiquid crystalHalogenMaterials ChemistryFluorineHalogen Bonding Fluorine Liquid Crystals Photoresponsive MaterialsSettore CHIM/07 - Fondamenti Chimici Delle Tecnologie0210 nano-technology
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On the impact of linking groups in hydrogen-bonded liquid crystals – a case study

2018

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.

Materials scienceHydrogenChemiechemistry.chemical_element02 engineering and technologyGeneral Chemistry010402 general chemistry021001 nanoscience & nanotechnologyCondensed Matter Physics01 natural sciences0104 chemical sciencesCrystallographychemistryGroup (periodic table)Liquid crystalSide chain0210 nano-technologySoft Matter
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CCDC 1866422: Experimental Crystal Structure Determination

2019

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

Space GroupCrystallographyCrystal SystemCrystal StructureCell Parameters1-(4-propoxyphenyl)-2-(235-trifluoro-4-iodophenyl)diazene 4-[2-(4-methoxyphenyl)ethenyl]pyridineExperimental 3D Coordinates
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CCDC 1886744: Experimental Crystal Structure Determination

2019

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

Space GroupCrystallographytris(4-{[4-(hexyloxy)phenyl]diazenyl}pyridine) 2-[(hydroxyimino)methyl]benzene-135-triolCrystal SystemCrystal StructureCell ParametersExperimental 3D Coordinates
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CCDC 1866421: Experimental Crystal Structure Determination

2019

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

Space GroupCrystallographyCrystal SystemCrystal StructureCell Parameters1-(4-propoxyphenyl)-2-(236-trifluoro-4-iodophenyl)diazene 4-[2-(4-methoxyphenyl)ethenyl]pyridineExperimental 3D Coordinates
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CCDC 1455700: Experimental Crystal Structure Determination

2016

Related Article: Michael Pfletscher, Christoph Wölper, Jochen S. Gutmann, Markus Mezger, Michael Giese|2016|Chem.Commun.|52|8549|doi:10.1039/C6CC03966A

Space GroupCrystallographyCrystal SystemCrystal StructureCell Parameterstris(4-((4-butoxyphenyl)diazenyl)pyridine) benzene-135-triolExperimental 3D Coordinates
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CCDC 1886743: Experimental Crystal Structure Determination

2019

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

Space GroupCrystallographyCrystal SystemCrystal StructureCell Parametersbis(4-[(4-propoxyphenyl)diazenyl]pyridine) 1-(246-trihydroxyphenyl)ethan-1-oneExperimental 3D Coordinates
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CCDC 1866420: Experimental Crystal Structure Determination

2019

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

Space GroupCrystallography1-(4-propoxyphenyl)-2-(2356-tetrafluoro-4-iodophenyl)diazene 4-[2-(4-methoxyphenyl)ethenyl]pyridineCrystal SystemCrystal StructureCell ParametersExperimental 3D Coordinates
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CCDC 1884535: Experimental Crystal Structure Determination

2019

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

Space GroupCrystallography4-{[4-(octyloxy)phenyl]diazenyl}pyridine 2-nitrobenzene-135-triolCrystal SystemCrystal StructureCell ParametersExperimental 3D Coordinates
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