Francesco Nastasi

University of Messina

Author Statistics

Papers

Citation

H-Index

i-10 index

Research Trends

Author Order

Document Type

Co-Authors

Sebastiano Campagna

University of Messina

Fausto Puntoriero

University of Messina

Giuseppina La Ganga

University of Messina

Scolastica Serroni

University of Messina

A. Santoro

University of Messina

Antonino Arrigo

University of Messina

Maurilio Galletta

University of Messina

Raymond Ziessel

Newcastle University

Philippe P. Lainé

Interfaces Traitements Organisation et Dynamique des Systèmes

Marie‐Pierre Santoni

Centre National de la Recherche Scientifique

Cooperative Institutions

University of Messina

Centre National de la Recherche Scientifique

University of Catania

National Research Council

Université de Strasbourg

Institute for Chemical and Physical Processes

Instituto de Ciências Farmacêuticas

University of Bologna

National Interuniversity Consortium of Materials Science and Technology

Institute for Microelectronics and Microsystems

Author Statistics

Papers

Citation

H-Index

i-10 index

Research Field

Photoinduced water oxidation sensitized by a tetranuclear Ru(ii) dendrimer

Dalton Transactions (2009)

Giuseppina La Ganga Francesco Nastasi Sebastiano Campagna Fausto Puntoriero

A multimetallic ruthenium(II) dendrimer is used for the first time to photosensitize dioxygen production from water by IrO2 nanoparticles; the system is more efficient than an analogous system based on the more commonly used [Ru(bpy)3]2+-type photosensitizers, in particular for the ability of the dendrimer to take advantage of the red portion of the solar spectrum.

Broad spectrum

10.1039/b907257h

Cite

Citations (37)

Metal‐Catalyzed Hydride Transfer from Alcohols to Photoexcited Dipyridophenazine^†

Photochemistry and Photobiology (2021)

Joseph M. Aslan Melissa M. Reardon Nagham Alatrash Francesco Nastasi Frederick M. MacDonnell

Abstract Dipyridophenazine (dppz) is known to react with alcohols upon photoexcitation into an n‐π* transition at 378 nm to yield dihydrodipyridophenazine (dppzH 2 ). This process occurs via H‐atom abstraction from alcohols and subsequent disproportionation of the dppzH • radical species, to the final product. This reaction shows a primary kinetic isotope effect (KIE = 4.9) in methanol/perdeuteromethanol solvents, consistent with H‐atom transfer processes. Addition of excess Zn(II) ions to the dppz solution not only accelerates the rate of photoreduction, but also lowers the KIE to 1.7, indicating a change in reaction mechanism. We postulate that the coordination of the alcoholic solvent to Zn(II) activates the alcohol α C‐H bonds toward hydride transfer processes which would be consistent with the lowered KIE and faster overall reduction of the aromatic ligand. Interestingly, this appears to be an intramolecular process in which the Zn(II) is coordinated to both the dppz ligand and the reactive alcohol, as a sharp inflection in the overall rate increase is observed at a Zn:dppz ratio of 2:1. At this ratio, the dominant dppz species involves a Zn(II) bound to one dppz and several solvent molecules (methanol and water).

Kinetic isotope effect

Photoexcitation

10.1111/php.13437

Cite

Citations (0)

Fast transport of HCl across a hydrophobic layer over macroscopic distances by using a Pt(ii) compound as the transporter: micro- and nanometric aggregates as effective transporters

Dalton Transactions (2020)

Antonino Giannetto Francesco Nastasi Fausto Puntoriero Giovanni Bella Sebastiano Campagna

Nano- and micrometric chloroform aggregates formed because of the dynamic behavior of the carrier Pt in the presence of HCl are responsible for the fast transport of HCl across a hydrophobic layer over macroscopic distances.

10.1039/d0dt03600e

Cite

Citations (8)

Multichromophoric hybrid species made of perylene bisimide derivatives and Ru(ii) and Os(ii) polypyridine subunits

Physical Chemistry Chemical Physics (2017)

Francesco Nastasi Giuseppina La Ganga Sebastiano Campagna Zois Syrgiannis Francesco Rigodanza

Herein, the synthesis and the photophysical and redox properties of a new perylene bisimide (PBI) species (L), bearing two 1,10-phenanthroline (phen) ligands at the two imide positions of the PBI, and its dinuclear Ru(ii) and Os(ii) complexes, [(bpy)2Ru(μ-L)Ru(bpy)2](PF6)4 (Ru2; bpy = 2,2'-bipyridine) and [(Me2-bpy)2Os(μ-L)Os(Me2-bpy)2](PF6)4 (Os2; Me2-bpy = (4,4'-dimethyl)-2,2'-bipyridine), are reported. The absorption spectra of the compounds are dominated by the structured bands of the PBI subunit due to the lowest-energy spin-allowed π-π* transition. The spin-allowed MLCT transitions in Ru2 and Os2 are inferred by the absorption at 350-470 nm, where the PBI absorption is negligible. The absorption band extends towards the red region for Os2 due to the spin-forbidden MLCT transitions, intensified by the heavy osmium center. The reduction processes of the compounds are dominated by two successive mono-electronic PBI-based processes, which in the metal complexes are slightly shifted compared to the free ligand. On oxidation, both metal complexes undergo an apparent bi-electronic process (at 1.31 V vs. SCE for Ru2 and 0.77 V for Os2), attributed to the simultaneous one-electron oxidation of the two weakly-interacting metal centers. In Ru2 and Os2, the intense fluorescence of L subunit (λmax, 535 nm; τ, 4.3 ns; Φ, 0.91) is fully quenched, mainly by photoinduced electron transfer from the metal centers, on the ps timescale (time constant, 11 ps in Ru2 and 3 ps in Os2). Such photoinduced electron transfer leads to the formation of a charge-separated state, which directly decays to the ground state in about 70 ps in Os2, but produces the triplet π-π* state of the PBI subunit in 35 ps in Ru2. The results provide information on the excited-state processes of the hybrid species combining two dominant classes of chromophore/luminophore species, the PBI and the metal polypyridine complexes, and can be used for future design on new hybrid species with made-to-order properties.

10.1039/c7cp01597f

Cite

Citations (4)

CCDC 744711: Experimental Crystal Structure Determination

The Cambridge Structural Database (2011)

Jérôme Fortage F. Tuyeras P. Ochsenbein F. Puntoriero Francesco Nastasi

An entry from the Cambridge Structural Database, the world’s repository for small molecule crystal structures. The entry contains experimental data from a crystal diffraction study. The deposited dataset for this entry is freely available from the CCDC and typically includes 3D coordinates, cell parameters, space group, experimental conditions and quality measures.

10.5517/ccszxyl

Cite

Citations (0)

A New Carbon Dots-Eu(III) Complex as Red Emitting pH-Sensor

Lecture notes in electrical engineering (2022)

Giuseppe Nocito Fausto Puntoriero Sabrina Conoci Maurilio Galletta Francesco Nastasi

Carbon fibers

10.1007/978-3-031-08136-1_11

Cite

Citations (0)

Expanded Pyridiniums: Bis‐cyclization of Branched Pyridiniums into Their Fused Polycyclic and Positively Charged Derivatives—Assessing the Impact of Pericondensation on Structural, Electrochemical, Electronic, and Photophysical Features

Chemistry - A European Journal (2010)

Jérôme Fortage F. Tuyeras Philippe Ochsenbein Fausto Puntoriero Francesco Nastasi

Abstract This study evaluates the impact of the extension of the π‐conjugated system of pyridiniums on their various properties. The molecular scaffold of aryl‐substituted expanded pyridiniums (referred to as branched species) can be photochemically bis‐cyclized into the corresponding fused polycyclic derivatives (referred to as pericondensed species). The representative 1,2,4,6‐tetraphenylpyridinium ( 1 H ) and 1,2,3,5,6‐pentaphenyl‐4‐( p ‐tolyl)pyridinium ( 2 Me ) tetra‐ and hexa‐branched pyridiniums are herein compared with their corresponding pericondensed derivatives, the fully fused 9‐phenylbenzo[1,2]quinolizino[3,4,5,6‐ def ]phenanthridinium ( 1 H f ) and the hitherto unknown hemifused 9‐methyl‐1,2,3‐triphenylbenzo[ h ]phenanthro[9,10,1‐ def ]isoquinolinium ( 2 Me f ). Combined solid‐state X‐ray crystallography and solution NMR experiments showed that stacking interactions are barely efficient when the pericondensed pyridiniums are not appropriately substituted. The electrochemical study revealed that the first reduction process of all the expanded pyridiniums occurs at around −1 V vs. SCE, which indicates that the lowest unoccupied molecular orbital (LUMO) remains essentially localized on the pyridinium core regardless of pericondensation. In contrast, the electronic and photophysical properties are significantly affected on going from branched to pericondensed pyridiniums. Typically, the number of absorption bands increases with extended activity towards the visible region (down to ca. 450 nm in MeCN), whereas emission quantum yields are increased by three orders of magnitude (at ca. 0.25 on average). A relationship is established between the observed differential impact of the pericondensation and the importance of the localized LUMO on the properties considered: predominant for the first reduction process compared with secondary for the optical and photophysical properties.

HOMO/LUMO

10.1002/chem.201000504

Cite

Citations (46)

Photophysics of transition metal complexes

Photochemistry (2013)

Francesco Nastasi Maria Letizia Di Pietro Emanuela Trovato Fausto Puntoriero

This chapter deals with studies on the photophysical properties of selected metal complexes and their polynuclear supramolecular assemblies reported in literature in the period January 2011 to December 2012. The transition metal species considered here belong to families of complexes featuring largely studied optical properties. The complexes are from the following metal centres: d6 Ru(II), Os(II), Re(I), Ir(III) and Rh(III), d8 Pt(II) and Pd(II), d10 Cu(I) and Au(I), d3 Cr(III); finally some example is given of lanthanide (Ln) complexes or supramolecular arrays.

10.1039/9781849737722-00156

Cite

Citations (3)

Physicochemical Characterization and Antibacterial Properties of Carbon Dots from Two Mediterranean Olive Solid Waste Cultivars

Nanomaterials (2022)

Giuseppe Nocito Emanuele Luigi Sciuto Domenico Franco Francesco Nastasi Luca Pulvirenti

Carbon nanomaterials have shown great potential in several fields, including biosensing, bioimaging, drug delivery, energy, catalysis, diagnostics, and nanomedicine. Recently, a new class of carbon nanomaterials, carbon dots (CDs), have attracted much attention due to their easy and inexpensive synthesis from a wide range of precursors and fascinating physical, chemical, and biological properties. In this work we have developed CDs derived from olive solid wastes of two Mediterranean regions, Puglia (CDs_P) and Calabria (CDs_C) and evaluated them in terms of their physicochemical properties and antibacterial activity against Staphylococcus aureus (S. aureus) and Pseudomonas aeruginosa (P. aeruginosa). Results show the nanosystems have a quasi-spherical shape of 12-18 nm in size for CDs_P and 15-20 nm in size for CDs_C. UV-Vis characterization indicates a broad absorption band with two main peaks at about 270 nm and 300 nm, respectively, attributed to the π-π* and n-π* transitions of the CDs, respectively. Both samples show photoluminescence (PL) spectra excitation-dependent with a maximum at λem = 420 nm (λexc = 300 nm) for CDs_P and a red-shifted at λem = 445 nm (λexc = 300 nm) for CDs_C. Band gaps values of ≈ 1.48 eV for CDs_P and ≈ 1.53 eV for CDs_C are in agreement with semiconductor behaviour. ζ potential measures show very negative values for CDs_C compared to CDs_P (three times higher, -38 mV vs. -18 mV at pH = 7). The evaluation of the antibacterial properties highlights that both CDs have higher antibacterial activity towards Gram-positive than to Gram-negative bacteria. In addition, CDs_C exhibit bactericidal behaviour at concentrations of 360, 240, and 120 µg/mL, while lesser activity was found for CDs_P (bacterial cell reduction of only 30% at the highest concentration of 360 µg/mL). This finding was correlated to the higher surface charge of CDs_C compared to CDs_P. Further investigations are in progress to confirm this hypothesis and to gain insight on the antibacterial mechanism of both cultivars.

Nanomaterials

Characterization

Carbon fibers

10.3390/nano12050885

Cite

Citations (20)

Front Cover: Mechanistic Insights into Light‐Activated Catalysis for Water Oxidation (Eur. J. Inorg. Chem. 15/2019)

European Journal of Inorganic Chemistry (2019)

Mirco Natali Francesco Nastasi Fausto Puntoriero Andrea Sartorel

The Front Cover shows a sundial from Vannes (Brittany region, France), on which the hours of the day have been replaced by the timescale of the photocatalytic cycle of water oxidation, spanning from femtoseconds to seconds (picture taken by Lisa Bissacco, picture edited by Fausto Puntoriero). More information can be found in the Minireview by M. Natali, A. Sartorel et al. For more on the story behind the cover research, see the Cover Profile.

Front cover

Cover story

10.1002/ejic.201900364

Cite

Citations (0)