A5087904857- Supramolecular Chemistry and Complexes
- Luminescence and Fluorescent Materials
- Supramolecular Self-Assembly in Materials
- Photochromic and Fluorescence Chemistry
- Photoreceptor and optogenetics research
- Molecular Sensors and Ion Detection
- Porphyrin and Phthalocyanine Chemistry
- Crystallization and Solubility Studies
- Molecular Junctions and Nanostructures
- X-ray Diffraction in Crystallography
- Conducting polymers and applications
- Crystallography and molecular interactions
- DNA and Nucleic Acid Chemistry
- Radical Photochemical Reactions
- Mass Spectrometry Techniques and Applications
- Polydiacetylene-based materials and applications
- Electrospun Nanofibers in Biomedical Applications
- Inorganic Fluorides and Related Compounds
- Advanced Sensor and Energy Harvesting Materials
- Advanced Memory and Neural Computing
- Electrocatalysts for Energy Conversion
- Chemical Reactions and Isotopes
- Liquid Crystal Research Advancements
- Catalysis and Oxidation Reactions
- Fluorine in Organic Chemistry
Institute of Organic Synthesis and Photoreactivity
2018-2024
National Research Council
2024
University of Bologna
2017-2023
Bologna Research Area
2021
Queen Mary University of London
2015
We exploit a reversible acid–base triggered molecular shuttling process to switch an appropriately designed rotaxane between prochiral and mechanically planar chiral forms. The enantiomers their interconversion, arising from ring shuttling, have been characterized by NMR spectroscopy. also show that the supramolecular interaction of positively charged with optically active anions causes imbalance in population two enantiomeric coconformations. This result represents unprecedented example...
We describe the modular design of a pseudorotaxane-based supramolecular pump and its photochemically driven autonomous nonequilibrium operation in dissipative regime. These properties derive from careful engineering energy maxima minima along threading coordinate their light-triggered modulation. Unlike precursor, this second-generation system is amenable to functionalization for integration into more complex devices.
Abstract The development and investigation of (supra)molecular‐based architectures characterized by light‐activated functionalities is a highly relevant topic chemical research. interest on photo‐controlled systems arises not only from their potential applications in different fields technology but also scientific significance related to the understanding light–matter interactions at nanoscale. Indeed, light peculiar unique tool as it can be conveniently applied supply energy required affect...
The general principles guiding the design of molecular machines based on interlocked structures are well known. Nonetheless, identification suitable components for a precise tuning energetic parameters that determine mechanical link is still challenging. Indeed, what reasons "all-or-nothing" effect, which turns "speed-bump" into stopper in pseudorotaxane-based architectures? Here we investigate threading and dethreading processes representative class components, symmetric dibenzylammonium...
Researchers continue to generate ingenious (supra)molecular structures in which light can trigger controlled and directed movements of the components.
The development of artificial nanoscale motors that can use energy from a source to perform tasks requires systems capable performing directionally controlled molecular movements and operating away chemical equilibrium. Here, the design, synthesis properties pseudorotaxanes are described, in which photon input triggers unidirectional motion macrocyclic ring with respect non-symmetric axle. photoinduced ratcheting at basis pumping mechanism is validated by measuring relevant thermodynamic...
We report the synthesis and characterisation of [2]rotaxanes based on a stilbazolium dye calix[6]arene macrocycle. Since both components are non-symmetric, two orientational isomers obtained. The display distinct photophysical photochemical properties in solution solid state, superior to unencapsulated dye.
The translation of the well-known reversible electrochemical switching viologen species from solution to solid state may open enormous possibilities for developing electrically responsive materials. In this work, we present and discuss response a derivative, 1,1′-dipropyl-4,4′-bipyridinium bis-hexafluorophosphate (Bpy2+), embedded into polyurethane fibrous matrix. results showcase possibility stimulate electrochemically active molecule inside polymer fibers, both in random aligned...
Abstract The general principles guiding the design of molecular machines based on interlocked structures are well known. Nonetheless, identification suitable components for a precise tuning energetic parameters that determine mechanical link is still challenging. Indeed, what reasons “all‐or‐nothing” effect, which turns “speed‐bump” into stopper in pseudorotaxane‐based architectures? Here we investigate threading and dethreading processes representative class components, symmetric...
Chemical actinometers are a useful tool in photochemistry, which allows to measure the photon flux of light source carry out quantitative analysis on photoreactions. The most commonly employed so far show minor drawbacks, such as difficult data treatment, parasite reactions, low stability or impossible reset. We propose herewith use 4,4'-dimethylazobenzene chemical actinometer. This compound undergoes clean and efficient E/Z isomerization, approaching total conversion upon irradiation at 365...
Here, we exploited the UV light and thermal triggered E ↔ Z photoisomerization of an azobenzene compound to fabricate multimodal readable rewritable data matrix based devices.
Abstract A versatile and simple methodology for the creation of mixed monolayers on glassy carbon (GC) surfaces was developed, using an osmium–bipyridyl complex anthraquinone as model redox probes. The work consisted in electrochemical grafting GC a mixture mono‐protected diamine linkers varying ratios which, after attachment to surface, allowed orthogonal deprotection. After optimisation deprotection conditions, it possible remove one protecting groups selectively, couple suitable osmium...
Abstract Modified crown ethers are fundamental building blocks in supramolecular chemistry, with applications phase transfer catalysis, metal extraction, smart materials, and molecular machines. Here we report on a one‐pot highly chemo‐ regioselective photocatalytic fluoroalkylation protocol for the mono‐functionalization of benzo substituted ethers. For this important class macrocycles, method described here represents one few late‐stage functionalization procedures that is both high...
We describe the synthesis and characterization of a [2]rotaxane comprising dibenzo‐24‐crown‐8 (DB24C8) macrocyclic component thread containing three recognition sites: ammonium (AmH+), bipyridinium (Bpy2+) triazolium (Trz+). AmH+ Bpy2+ are responsive to fully orthogonal stimuli, pH electrochemical, which allows precisely control directional translation macrocycle along axle. A better understanding processes driving operation system was obtained thanks an in‐depth thermodynamic...
We describe the synthesis and characterization of a [2]rotaxane comprising dibenzo‐24‐crown‐8 (DB24C8) macrocyclic component thread containing three recognition sites: ammonium (AmH+), bipyridinium (Bpy2+) triazolium (Trz+). AmH+ Bpy2+ are responsive to fully orthogonal stimuli, pH electrochemical, which allows precisely control directional translation macrocycle along axle. A better understanding processes driving operation system was obtained thanks an in‐depth thermodynamic...
Natural and artificial autonomous molecular machines operate by constantly dissipating energy coming from an external source to maintain a non-equilibrium state. The in-depth study of these dissipative states is highly challenging as they exist only long provided. Here we report on the detailed physicochemical characterization operation supramolecular pump transducing light into chemical shifting equilibrium self-assembly reactions. composition system under irradiation was followed in...