A5070352772- Electrocatalysts for Energy Conversion
- Advanced Photocatalysis Techniques
- Crystallization and Solubility Studies
- X-ray Diffraction in Crystallography
- Porphyrin and Phthalocyanine Chemistry
- Metalloenzymes and iron-sulfur proteins
- CO2 Reduction Techniques and Catalysts
- Advanced Nanomaterials in Catalysis
- Polyoxometalates: Synthesis and Applications
- Radical Photochemical Reactions
- Metal-Catalyzed Oxygenation Mechanisms
- Advanced battery technologies research
- Photochemistry and Electron Transfer Studies
- Oxidative Organic Chemistry Reactions
- Organic Light-Emitting Diodes Research
- Photosynthetic Processes and Mechanisms
- Metal complexes synthesis and properties
- Luminescence and Fluorescent Materials
- Magnetism in coordination complexes
- Catalytic C–H Functionalization Methods
- Carbon dioxide utilization in catalysis
- Copper-based nanomaterials and applications
- Catalytic Processes in Materials Science
- Sulfur-Based Synthesis Techniques
- Quantum Dots Synthesis And Properties
University of Ferrara
2016-2025
Istituto Nazionale di Fisica Nucleare, Sezione di Ferrara
2014-2020
University of Padua
2015
University of Trieste
2013
Institut de Science et d'Ingénierie Supramoléculaires
2013
Isostructural cubane-shaped catalysts [Co(III)(4)(μ-O)(4)(μ-CH(3)COO)(4)(p-NC(5)H(4)X)(4)], 1-X (X = H, Me, t-Bu, OMe, Br, COOMe, CN), enable water oxidation under dark and illuminated conditions, where the primary step of photoinduced electron transfer obeys to Hammett linear free energy relationship behavior. Ligand design catalyst optimization are instrumental for sustained O(2) productivity with quantum efficiency up 80% at λ > 400 nm, thus opening a new perspective in vitro molecular...
Abstract The functional core of oxygenic photosynthesis is in charge catalytic water oxidation by a multi‐redox Mn III /Mn IV manifold that evolves through five electronic states (S i , where =0–4). synthetic model system this cycle and its S 0 →S 4 intermediates the expected turning point for artificial photosynthesis. tetramanganese‐substituted tungstosilicate [Mn 3 O (CH COO) (A‐α‐SiW 9 34 )] 6− (Mn POM) offers an unprecedented mimicry natural reduced state; it features hybrid...
Catalytic amounts (2.5 mol %) of [Fe(bpy)3]Br2 complex in the presence visible light and MacMillan catalyst 3 (20 are highly effective promoting an enantioselective organocatalytic photoredox alkylation aldehydes with various α-bromo carbonyl compounds. Reaction yields isolated compounds enantioselectivities very good comparable to ones obtained by [Ru(bpy)3]2+, organic dyes, or semiconductors, same organocatalysts. The use first-row, abundant, cheap metals photocatalyzed reactions can open...
Efficient photocatalytic hydrogen evolution is obtained from 1 M phosphate buffer at pH 7 in the presence of a Ru(bpy)3(2+) sensitizer, an ascorbic acid sacrificial donor, and water-soluble Co(II) porphyrin catalyst. Spectroscopic investigation system by stationary time-resolved techniques enables complete characterization photoinduced dynamics.
The first water oxidation catalyst containing only vanadium atoms as metal centers is reported. compound the mixed-valence [(VIV5VV1)O7(OCH3)12]− species, 1. Photoinduced catalyzed by 1, in presence of Ru(bpy)32+ (bpy = 2,2′-bipyridine) and Na2S2O8, acetonitrile/aqueous phosphate buffer takes place with a quantum yield 0.20. A hole scavenging reaction between photochemically generated Ru(bpy)33+ 1 occurs bimolecular rate constant 2.5 × 108 M–1 s–1. time-resolved formation oxidized molecular...
The ability of a new pentapyridine cobalt(<sc>ii</sc>) complex to power photochemical hydrogen evolution from water is investigated in detail.
Photochemical hydrogen generation from aqueous solutions can be accomplished with a combination of at least three molecular components: namely, photosensitizer, hydrogen-evolving catalyst, and an electron donor. A parameter that plays key role in the light to efficiency such three-component systems is solution pH. While this evidence has been usually observed several works aiming identifying catalysts optimizing their performances, detailed studies capable shining on issue have extremely...
The increasing popularity of four-member rings in drug discovery has prompted the synthetic chemistry community to advance and reinvent old strategies craft these structures. Recently, strain-release concept been used build complex architectures. However, although there are many for accessing small carbocyclic derivatives, synthesis azetidines remains underdeveloped. Here we report a photocatalytic radical strategy densely functionalized from azabicyclo[1.1.0]butanes. protocol operates with...
Photoinduced water oxidation to molecular oxygen takes place in systems made of [Ru(bpy)3]2+ (bpy = 2,2′-bipyridine) as the photosensitizer, [Co4O4(O2CMe)4(py)4] (py pyridine) catalyst and Na2S2O8 sacrificial electron acceptor. The photochemical quantum yield process reaches outstanding value 30% depends on pH concentration. Transient absorption spectroscopy experiments aimed clarify first events photocatalytic are also reported.
The tetraruthenium polyoxometalate [Ru4(μ-O)4(μ-OH)2(H2O)4(γ-SiW10O36)2]10- (1) behaves as a very efficient water oxidation catalyst in photocatalytic cycles using Ru(bpy)32+ sensitizer and persulfate sacrificial oxidant. Two interrelated issues relevant to this behavior have been examined detail: (i) the effects of ion pairing between polyanionic cationic sensitizer, (ii) kinetics hole transfer from oxidized catalyst. Complementary charge interactions aqueous solution leads an static...
Water oxidation catalysts: evolution of [Co4(H2O)2(α-PW9O34)2]10− to catalytically active species is assessed by laser flash photolysis in sacrificial photocatalytic cycles with Ru(bpy)32+ as a photosensitizer.
A salophen cobalt(II) complex enables water oxidation at neutral pH in photoactivated sacrificial cycles under visible light, thus confirming the high appeal of earth abundant single site catalysis for artificial photosynthesis.
Abstract A noble‐metal‐free system for photochemical hydrogen production is described, based on ascorbic acid as sacrificial donor, aluminium pyridyl porphyrin photosensitizer, and cobaloxime catalyst. Although the platform has docking sites both donor catalyst, resulting associated species are essentially inactive because of fast unimolecular reversible electron‐transfer quenching. Rather, photochemically active fraction sensitizer present, in aqueous/organic solvent used evolution, free...
Photochemical hydrogen evolution studies aimed at evaluating new molecular catalysts have usually exploited Ru(bpy)3(2+) (where bpy = 2,2'-bipyridine) as the reference photosensitizer, thanks to its suitable optical and redox properties. In principle, an additional improvement of photocatalytic performances can be achieved also by a careful adjustment photophysical and/or electrochemical characteristics ruthenium-based sensitizer. Herein we describe homogeneous systems for composed series...
Twelve naphthochromenone photocatalysts (PCs) were synthesized on gram scale. They absorb across the UV/Vis range and feature an extremely wide redox window (up to 3.22 eV) that is accessible using simple visible light irradiation sources (CFL or LED). Their excited-state potentials, PC*/PC.- 1.65 V) PC.+ /PC* -1.77 V vs. SCE), are such these novel PCs can engage in both oxidative reductive quenching mechanisms with strong thermodynamic requirements. The potential of bimodal was benchmarked...
Cobalt(ii) complexes featuring hexadentate amino-pyridyl ligands have been recently discovered as highly active catalysts for the Hydrogen Evolution Reaction (HER), whose high performance arises from possibility of assisting proton transfer processes
Direct photochemical conversion of CO2 into a single carbon‐based product currently represents one the major issues in catalysis reduction reaction (CO2RR). In this work, we demonstrate that combination an organic photosensitizer with heptacoordinated iron(II) complex allows to attain noble‐metal‐free system capable efficient and selective CO upon light irradiation presence N,N‐diisopropylethylamine (DIPEA) 2,2,2‐trifluoroethanol (TFE) as electron proton donor, respectively, unprecedented...
Catalytic conversion of CO2 into carbon‐based products (CO2 reduction reaction, CO2RR) using light can be profitably achieved through the merging a molecular catalyst based on redox‐active metals, light‐harvesting sensitizer, and an electron donor. Within this framework, discovery novel chromophores represents critical task. Cyanoarenes are thermally‐activated delayed fluorescence (TADF) dyes which have been largely considered as photoactive components in field lighting organic...
Photocatalytic nanomaterials offer promising solutions for conducting chemical transformations under safe, green and sustainable conditions. In particular, the storage of solar energy into bonds is an appealing but challenging...
In this work we have successfully synthesized five new heteroleptic copper(I) complexes ( C1–5 ), bearing N,N ligands derived from dipyridylamine and S -BINAP as the P,P auxiliary ligand. All were structurally...
Abstract A novel, highly stable photochromic dyad 3 based on a perylene bisimide (PBI) fluorophore and diarylethene (DAE) photochrome was synthesized the optical photophysical properties of this were studied in detail by steady‐state time‐resolved ultrafast spectroscopy. This can be switched reversibly UV‐light irradiation its ring‐open form o leading to ring‐closed c , back reaction with visible light. Solvent‐dependent fluorescence studies revealed that emission is drastically quenched...