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134 results on '"Salvitti, Chiara"'

2. Photo-Activated Carbon Dots as Catalysts in Knoevenagel Condensation: An Advance in the Synthetic Field.

Author

Michenzi, Cinzia, Scaramuzzo, Francesca, Salvitti, Chiara, Pepi, Federico, Troiani, Anna, and Chiarotto, Isabella

Subjects
CARBON nanodots, CATALYSTS, METHYLENE compounds, PHOTOCHEMISTRY, ALDEHYDES
Abstract

Photoinduced chemical reactions and the development of new materials represent a current and significant topic. We present a sustainable and eco-friendly approach to the Knoevenagel condensation reaction involving carbonyl and active methylene compounds. Our method utilizes photo-activated carbon dots (CDs) derived from 5-hydroxymethylfurfural (5HMF) within an aqueous medium and does not require acidic, basic, or thermal conditions. This protocol operates effectively with aromatic, aliphatic, and heteroaromatic aldehydes and ketones. The 5HMF-derived-CDs can be reused four times without significant loss of activity. Moreover, this methodology is suitable for scaling up reactions, thereby highlighting its potential for industrial applications. [ABSTRACT FROM AUTHOR]

Published
2024
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20. The Peroxymonocarbonate Anion HCO 4 − as an Effective Oxidant in the Gas Phase: A Mass Spectrometric and Theoretical Study on the Reaction with SO 2.

Author

Salvitti, Chiara, Pepi, Federico, Troiani, Anna, Rosi, Marzio, and de Petris, Giulia

Subjects
*ELECTROSPRAY ionization mass spectrometry, *SULFUR trioxide, *ANIONS
Abstract

The peroxymonocarbonate anion, HCO4−, the covalent adduct between the carbon dioxide and hydrogen peroxide anion, effectively reacts with SO2 in the gas phase following three oxidative routes. Mass spectrometric and electronic structure calculations show that sulphur dioxide is oxidised through a common intermediate to the hydrogen sulphate anion, sulphur trioxide, and sulphur trioxide anion as primary products through formal HO2−, oxygen atom, and oxygen ion transfers. The hydrogen sulphite anion is also formed as a secondary product from the oxygen atom transfer path. The uncommon nucleophilic behaviour of HCO4− is disclosed by the Lewis acidic properties of SO2, an amphiphilic molecule that forms intermediates with characteristic and diagnostic geometries with peroxymonocarbonate. [ABSTRACT FROM AUTHOR]

Published
2023
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29. Cover Feature: Photo‐activated Carbon dots (CDs) as Catalysts in the Knoevenagel Condensation: A Mechanistic Study by Dual‐Mode Monitoring via ESI‐MS (ChemPlusChem 8/2024).

Author

Cosentino, Francesca, Michenzi, Cinzia, Di Noi, Alessia, Salvitti, Chiara, Pepi, Federico, de Petris, Giulia, Chiarotto, Isabella, and Troiani, Anna

Subjects
RADICAL anions, CONDENSATION, CATALYSTS, SUPEROXIDES
Abstract

This article, published in ChemPlusChem, discusses the use of electrospray ionization mass spectrometry (ESI-MS) to monitor the Knoevenagel condensation reaction catalyzed by carbon dots that are activated by UV light. The authors of the article focus on the role of the superoxide radical anion in the formation of the reaction product. The research article provides more in-depth details on this topic and is authored by Chiara Salvitti, Isabella Chiarotto, Anna Troiani, and their colleagues. [Extracted from the article]

Published
2024
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37. Vitamin C: an experimental and theoretical study on the gas-phase structure and ion energetics of protonated ascorbic acid

Author

Ricci, Andreina, Pepi, Federico, Cimino, Paola, Troiani, Anna, Garzoli, Stefania, Salvitti, Chiara, Di Rienzo, Brunella, Barone, Vincenzo, Ricci, Andreina, Pepi, Federico, Cimino, Paola, Troiani, Anna, Garzoli, Stefania, Salvitti, Chiara, Di Rienzo, Brunella, and Barone, Vincenzo

Subjects
Kinetic, Ions, Models, Molecular, gas-phase basicity of ascorbic acid, Gase, p), B3LYP/6-31 + G(d, Ascorbic Acid, DFT, quantum mechanical calculation, Mass Spectrometry, (ESI/TQ/MS), protonated ascorbic acid, Kinetics, Gases, Ion, kinetic method, mass spectrometry, spectroscopy, Spectroscopy, (ESI/TQ/MS), B3LYP/6-31 + G(d,p) , DFT
Abstract

In order to investigate the gas-phase mechanisms of the acid catalyzed degradation of ascorbic acid (AA) to furan, we undertook a mass spectrometric (ESI/TQ/MS) and theoretical investigation at the B3LYP/6-31 + G(d,p) level of theory. The gaseous reactant species, the protonated AA, [C6 H8 O6 ]H(+) , were generated by electrospray ionization of a 10(-3) M H2 O/CH3 OH (1 : 1) AA solution. In order to structurally characterize the gaseous [C6 H8 O6 ]H(+) ionic reactants, we estimated the proton affinity and the gas-phase basicity of AA by the extended Cooks's kinetic method and by computational methods at the B3LYP/6-31 + G(d,p) level of theory. As expected, computational results identify the carbonyl oxygen atom (O2) of AA as the preferred protonation site. From the experimental proton affinity of 875.0 ± 12 kJ mol(-1) and protonation entropy ΔSp 108.9 ± 2 J mol(-1) K(-1) , a gas-phase basicity value of AA of 842.5 ± 12 kJ mol(-1) at 298 K was obtained, which is in agreement with the value issuing from quantum mechanical computations. Copyright © 2016 John Wiley & Sons, Ltd.

Published
2016

38. Charge‐Tagged N‐Heterocyclic Carbenes (NHCs): Revealing the Hidden Side of NHC‐Catalysed Reactions through Electrospray Ionization Mass Spectrometry.

Author

Salvitti, Chiara, Chiarotto, Isabella, Pepi, Federico, and Troiani, Anna

Subjects
*ELECTROSPRAY ionization mass spectrometry, *CARBENES
Abstract

N‐heterocyclic carbenes (NHCs) are key intermediates in a variety of chemical reactions. Owing to their transient nature, the interception and characterization of these reactive species have always been challenging. Similarly, the study of reaction mechanisms in which carbenes act as catalysts is still an active research field. This Minireview describes the contribution of electrospray ionization mass spectrometry (ESI‐MS) to the detection of charge‐tagged NHCs resulting from the insertion of an ionic group into the molecular scaffold. The use of different mass spectrometric techniques, combined with the charge‐tagging strategy, allowed clarification of the involvement of NHCs in archetypal reactions and the study of their intrinsic chemistry. [ABSTRACT FROM AUTHOR]

Published
2021
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49. Characterization of naproxen–polymer conjugates for drug-delivery

Author

Forte, Gianpiero, primary, Chiarotto, Isabella, additional, Giannicchi, Ilaria, additional, Loreto, Maria Antonietta, additional, Martinelli, Andrea, additional, Micci, Roberta, additional, Pepi, Federico, additional, Rossi, Serena, additional, Salvitti, Chiara, additional, Stringaro, Annarita, additional, Tortora, Luca, additional, Vecchio Ciprioti, Stefano, additional, and Feroci, Marta, additional

Published
2015
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