Bart Jan Ravoo
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Photoswitchable Peptides as Molecular Tools to Encode Structural Order and Disorder in Intracellular Assemblies Open
Understanding how self‐assembled structure formation affects cells remains a central challenge in supramolecular chemistry. However, chemical tools that allow access to both ordered and disordered intracellular assemblies from a single mol…
Photoregulation of the Chiral Nematic Phase by Using a Hexa-Arylazopyrazole-Substituted Co(III) Complex Open
A photoresponsive hexa-arylazopyrazole-substituted tris-(β-diketonato) Co-(III) complex was synthesized, and the Λ- and Δ-enantiomers were isolated. The complex shows reversible E/Z isomerization using UV (λmax = 365 nm) and visible light …
Orthogonal Photoswitching in Nematic Liquid Crystals Open
Photoresponsive materials capable of orthogonal and path‐independent switching are crucial for developing adaptive materials and smart technologies. In this work, we showcase a dual light‐responsive nematic liquid crystalline system based …
Photoregulation of the Chiral Nematic Phase by Using a Hexa-Arylazopyrazole-Substituted Co(III) Complex Open
A photoresponsive hexa-arylazopyrazole-substituted tris(β-diketonato) Co(III) complexes was synthesized and the Λ- or Δ-enantiomers were isolated. The complex shows reversible E/Z isomerization using UV (λmax = 365 nm) or visible light (λm…
Photoregulation of the Chiral Nematic Phase by Using a Hexa-Arylazopyrazole-Substituted Co(III) Complex Open
A photoresponsive hexa-arylazopyrazole-substituted tris(β-diketonato) Co(III) complexes was synthesized and the Λ- or Δ-enantiomers were isolated. The complex shows reversible E/Z isomerization using UV (λmax = 365 nm) or visible light (λm…
Thiophene-fused aromatic belts Open
Aromatic belts, ultrashort carbon nanotubes, and related structures, are emerging molecular entities in the fields of organic electronics and supramolecular chemistry owing to their structural rigidity, fully fused π-conjugation, and well-…
Near-infrared responsive three-component supramolecular hydrogels of peptide, agarose and upconversion nanoparticles Open
A hydrogel composed of a photoresponsive peptide, agarose, and upconversion nanoparticles responds to NIR light irradiation. The nanoparticles convert NIR light to UV light, triggering a reversible gel-to-sol transition by peptide isomeriz…
View article: A host–guest approach to ratiometric pH sensing using upconversion nanoparticles
A host–guest approach to ratiometric pH sensing using upconversion nanoparticles Open
A new pH nanosensor based on β-NaYF 4 :Yb 3+ /Tm 3+ upconversion nanoparticles functionalized with cyclodextrin and a pH-sensitive adamantane-modified nitrobenzoxadiazole dye (NBD-Ad).
Azobisheteroarene photoswitches based on isoxazoles and pyrazoles: tunable photostationary states, thermal relaxation and sensitization under confinement Open
Azo-type molecular photoswitches containing only pyrazoles and isoxazoles have numerous advantageous properties.
Photoresponsive molecular tweezers modulate Taspase 1 activity Open
“Claws Out!”: Molecular tweezers equipped with photoswitchable linkers dynamically open and close their “claws” on irradiation. This structural transition allows precise, reversible control over proteolytic activity in a light-dependent ma…
Nanocarriers for intracellular delivery of molecular payloads triggered by visible light Open
Green light for payload release: self-assembled nanocontainers release their contents upon exposure to visible light.
Exploring substituent effects in reversible photoswitchable low molecular weight arylazoisoxazole adhesives Open
Gluing with light: molecular design of low molecular weight arylazoisoxazole adhesives enhances their photoreversible phase transition and adhesive strength.
Sonochemical Nitroxide‐Mediated Polymerization: Harnessing Sonochemistry for Polymer Synthesis Open
In polymer science, mechanochemistry is emerging as a powerful tool for materials science and molecular synthesis, offering novel avenues for controlled polymerization and post‐synthetic modification. Building upon the previous research, n…
Surface Tension Manipulation with Visible Light through Sensitized Disequilibration of Photoswitchable Amphiphiles Open
Azoarene isomerization lies at the heart of numerous applications, from catalysis or energy storage to photopharmacology. While efficient switching between their E and Z isomers predominantly relies on UV light, a recent study by Klajn and…
Thiophene-fused aromatic belts Open
Aromatic belts, ultrashort carbon nanotubes and related structures, are emerging molecular entities in the fields of organic electronics and supramolecular chemistry owing to their structural rigidity, fully fused π-conjugation, and well-d…
Functional Linkers Support Targeting of Multivalent Tweezers to Taspase1 Open
Taspase 1 is a unique protease not only pivotal for embryonic development but also implicated in leukemias and solid tumors. As such, this enzyme is a promising while still challenging therapeutic target, and with its protein structure fea…
View article: Photoresponsive block copolymer nanostructures through implementation of arylazopyrazoles
Photoresponsive block copolymer nanostructures through implementation of arylazopyrazoles Open
Responsive nanomaterials that can undergo reversible changes in morphology are interesting for the development of functional materials that interact with and respond to their environment. Amphiphilic block copolymers are well known for the…
View article: Photoresponsive block copolymer nanostructures through implementation of arylazopyrazoles
Photoresponsive block copolymer nanostructures through implementation of arylazopyrazoles Open
Responsive nanomaterials that can undergo reversible changes in morphology are interesting for the development of functional materials that interact with and respond to their environment. Amphiphilic block copolymers are well known for the…
View article: Unravelling Competitive Interactions between Polymer Side Chains and End Groups with β‐Cyclodextrin
Unravelling Competitive Interactions between Polymer Side Chains and End Groups with β‐Cyclodextrin Open
This study investigates unexpected competitive host–guest interactions of β‐cyclodextrin (β‐CD), which can occur with polymers in aqueous solution, using the examples of the two polymers poly(oligo(ethylene glycol) methyl ether methacrylat…
View article: Unravelling competitive interactions between polymer side chains and end groups with β-cyclodextrin
Unravelling competitive interactions between polymer side chains and end groups with β-cyclodextrin Open
This study investigates unexpected competitive host-guest interactions of β-cyclodextrin which can occur with polymers in aqueous solution, using the examples of the two polymers poly(oligo(ethylene glycol) methyl ether methacrylate) (POEG…
Surface Tension Manipulation with Visible Light through Sensitized Disequilibration of Photoswitchable Amphiphiles Open
The light-induced N=N double bond isomerization of azoarenes lies at the heart of numerous applications ranging from catalysis, energy storage, or drug release to optogenetics and photopharmacology. While efficient switching between their …
Synthesis of Photoresponsive Water-Dispersible Magnetite Nanoparticles using Arylazopyrazole Modified Polymers Open
In order to design new nanomaterials with improved functionalities, magnetite nanoparticles (MNP) modified with arylazopyrazole (AAP) molecular photoswitches are presented. Water-dispersibility is achieved by using poly(acrylic acid) (pAA)…
Stiffness Modulation and Pulsatile Release in Dual Responsive Hydrogels Open
Inspired by nature, self‐regulation can be introduced in synthetic hydrogels by incorporating chemo‐mechanical signals or coupled chemical reactions to maintain or adapt the material's physico‐chemical properties when exposed to external t…
Photoswitching of arylazopyrazoles upon S<sub>1</sub> (nπ*) excitation studied by transient absorption spectroscopy and <i>ab initio</i> molecular dynamics Open
Arylazopyrazoles (AAPs) are an important class of molecular photoswitches with high photostationary states (PSS) and long thermal lifetimes.
View article: Calamitic Liquid Crystals for Reversible Light‐Modulated Phase Regulation Based on Arylazopyrazole Photoswitches
Calamitic Liquid Crystals for Reversible Light‐Modulated Phase Regulation Based on Arylazopyrazole Photoswitches Open
Invited for the cover of this issue are the groups of Kentaro Tanaka at Nagoya University and Bart Jan Ravoo at the University of Münster. The image depicts the photoisomerization of a mesogen upon irradiation with different wavelengths of…
View article: Front Cover: Calamitic Liquid Crystals for Reversible Light‐Modulated Phase Regulation Based on Arylazopyrazole Photoswitches (Chem. Eur. J. 2/2024)
Front Cover: Calamitic Liquid Crystals for Reversible Light‐Modulated Phase Regulation Based on Arylazopyrazole Photoswitches (Chem. Eur. J. 2/2024) Open
Graphical Abstract A birefringent thin film of liquid crystals based on photoswitchable arylazopyrazoles has been created. The typical schlieren structure is indicative of calamitic liquid crystals. Upon irradiation with UV light, the meso…
Photoswitching of arylazopyrazoles upon S1 (nπ*) excitation studied by transient absorption and ab-initio molecular dynamics Open
Arylazopyrazoles (AAPs) are an important class of molecular photoswitches with high photostationary states (PSS) and long thermal lifetimes. The ultrafast photoisomerization of four water-soluble arylazopyrazoles, all of them featuring an …
View article: Calamitic Liquid Crystals for Reversible Light‐Modulated Phase Regulation Based on Arylazopyrazole Photoswitches
Calamitic Liquid Crystals for Reversible Light‐Modulated Phase Regulation Based on Arylazopyrazole Photoswitches Open
The design of responsive liquid crystals enables a diversity of technological applications. Especially photochromic liquid crystals gained a lot of interest in recent years due to the excellent spatiotemporal control of their phase transit…
View article: Adaptive Photochemical Nonlinearities for Optical Neural Networks
Adaptive Photochemical Nonlinearities for Optical Neural Networks Open
Optical neural networks (ONNs) hold great potential for faster and more energy‐efficient information processing in coherent photonic circuits. To realize ONNs, linear combinations and nonlinear activation functions have to be implemented i…