Search

Your search keyword '"Gaeta, Carmine"' showing total 599 results
Start Over Author "Gaeta, Carmine"
599 results on '"Gaeta, Carmine"'

9. Chirality Sensing of Cryptochiral Guests with Prism[n]arenes

Author

DELLA SALA, PAOLO, primary, Calice, Umberto, additional, Iuliano, Veronica, additional, Geremia, Silvano, additional, Hickey, Neal, additional, Belviso, Sandra, additional, Summa, Francesco Ferdinando, additional, Monaco, Guglielmo, additional, Gaeta, Carmine, additional, and Superchi, Stefano, additional

Published
2024
Full Text
View/download PDF

13. Novel Octacationic-Resorcin[4]arenes Featuring Quaternary Ammonium Groups as Multivalent Biocides

Author

Ferrara, Vittoria, primary, Iuliano, Veronica, additional, Neri, Placido, additional, Geremia, Silvano, additional, Hickey, Neal, additional, Di Stasio, Luca, additional, Vigliotta, Giovanni, additional, Paolella, Gaetana, additional, Caputo, I., additional, DELLA SALA, PAOLO, additional, Gaeta, Carmine, additional, and Talotta, Carmen, additional

Published
2024
Full Text
View/download PDF

15. Deep-Cavity Calix[4]naphth[4]arene Macrocycles: Synthesis, Conformational Features, and Solid-State Structures.

Author

Della Sala, Paolo, Iuliano, Veronica, De Rosa, Margherita, Talotta, Carmen, Del Regno, Rocco, Neri, Placido, Geremia, Silvano, Hickey, Neal, and Gaeta, Carmine

Subjects
CONFORMATIONAL analysis, HYDROGEN bonding, AROMATIC compounds, NAPHTHALENE, PHENOL
Abstract

We recently introduced calix[n]naphth[m]arenes as a novel class of deep-cavity hybrid macrocycles constituted by phenol (n) and naphthalene (m) units. In this study, we report the synthesis, conformational analysis, spectroscopic properties, and solid-state structures of calix[4]naphth[4]arene (C4N4) and its permethylated analog (C4N4-Me), thereby expanding the calix[n]naphth[m]arene family. C4N4 was synthesized through a 2 + 2 fragment coupling macrocyclization under acidic conditions, where the solvent played a crucial role in selectively forming the C4N4 derivative. The X-ray structure of C4N4 reveals a chair-like 1,2,3,4-alternate conformation characterized by two opposing 3/4-cone moieties stabilized by intramolecular hydrogen bonds. In contrast, the X-ray structure of C4N4-Me exhibits a 1,3,5,7-alternate conformation. [ABSTRACT FROM AUTHOR]

Published
2024
Full Text
View/download PDF

18. Large Calixarenes

Author

Talotta, Carmen, Gaeta, Carmine, Soriente, Annunziata, De Rosa, Margherita, Geraci, Corrada, Neri, Placido, Neri, Placido, editor, Sessler, Jonathan L., editor, and Wang, Mei-Xiang, editor

Published
2016
Full Text
View/download PDF

28. Calix[2]naphth[2]arene: A Novel Class of Hybrid Macrocycles

Author

Del Regno, Rocco, DELLA SALA, Paolo, Spinella, Aldo, Talotta, Carmen, Silvano, Geremia, Neal, Hickey, Neri, Placido, and Gaeta, Carmine

Subjects
Aromatic compounds, Cations, Aromatic compounds, Cations, Conformation, Hydrocarbons, Macrocycles, Conformation, Macrocycles, Hydrocarbons
Published
2022

29. New supramolecular eco-friendly syntans for a more sustainable and ethic tanning process

Author

Quaratesi, Ilaria, Immacolata, Bruno, Antonio, Pauciulo, Andrea Roberta Bartiromo, Elena, Badea, Cristina, Carșote, Gaeta, Carmine, Neri, Placido, Noemi, Proietti, Valeria Di Tullio, Franca, Nuti, Rinaldi, Massimo, Antonuccio, Cepparrone, and Rocco, Gliubizzi

Subjects
Eco-friendly, oligosaccharide, inclusion complexes, syntans
Published
2022

31. Biodegradable leather: sodium alginate derivatives as re-tanning agents

Author

Quaratesi, Ilaria, Ioan, Călinescu, Petre, Chipurici, Cristina, Carșote, Concepció, Casas, Anna, Bacardit, Neri, Placido, Gaeta, Carmine, Rocco, Gliubizzi, Franca, Nuti, and Elena, Badea

Subjects
ultrasound technology, re-tanning agents, Biodegradable leather, Biodegradable leather, bio-renewable materials, sodium alginate, ultrasound technology, re-tanning agents, bio-renewable materials, sodium alginate
Published
2022

35. Hexahexyloxycalix[6]arene, a Conformationally Adaptive Host for the Complexation of Linear and Branched Alkylammonium Guests.

Author

Iuliano, Veronica, Talotta, Carmen, Della Sala, Paolo, De Rosa, Margherita, Soriente, Annunziata, Neri, Placido, and Gaeta, Carmine

Subjects
BINDING constant, MOLECULAR recognition, STEREOISOMERS
Abstract

Hexahexyloxycalix[6]arene 2b leads to the endo-cavity complexation of linear and branched alkylammonium guests showing a conformational adaptive behavior in CDCl3 solution. Linear n-pentylammonium guest 6a+ induces the cone conformation of 2b at the expense of the 1,2,3-alternate, which is the most abundant conformer of 2b in the absence of a guest. In a different way, branched alkylammonium guests, such as tert-butylammonium 6b+ and isopropylammonium 6c+, select the 1,2,3-alternate as the favored 2b conformation (6b+/6c+⊂2b1,2,3-alt), but other complexes in which 2b adopts different conformations, namely, 6b+/6c+⊂2bcone, 6b+/6c+⊂2bpaco, and 6b+/6c+⊂2b1,2-alt, have also been revealed. Binding constant values determined via NMR experiments indicated that the 1,2,3-alternate was the best-fitting 2b conformation for the complexation of branched alkylammonium guests, followed by cone > paco > 1,2-alt. Our NCI and NBO calculations suggest that the H-bonding interactions (+N–H···O) between the ammonium group of the guest and the oxygen atoms of calixarene 2b are the main determinants of the stability order of the four complexes. These interactions are weakened by increasing the guest steric encumbrance, thus leading to a lower binding affinity. Two stabilizing H-bonds are possible with the 1,2,3-alt- and cone-2b conformations, whereas only one H-bond is possible with the other paco- and 1,2-alt-2b stereoisomers. [ABSTRACT FROM AUTHOR]

Published
2023
Full Text
View/download PDF

39. Confused‐Prism[5]arene: a Conformationally Adaptive Host by Stereoselective Opening of the 1,4‐Bridged Naphthalene Flap.

Author

Della Sala, Paolo, del Regno, Rocco, Capobianco, Amedeo, Iuliano, Veronica, Talotta, Carmen, Geremia, Silvano, Hickey, Neal, Neri, Placido, and Gaeta, Carmine

Subjects
NAPHTHALENE, PLANAR chirality, STEREOISOMERS, MOLECULAR recognition
Abstract

The confused‐prism[5]arene macrocycle (c‐PrS[5]Me) shows conformational adaptive behavior in the presence of ammonium guests. Upon guest inclusion, the 1,4‐bridged naphthalene flap reverses its planar chirality from pS to pR (with reference to the pS(pR)4 enantiomer). Stereoselective directional threading is also observed in the presence of directional axles, in which up/down stereoisomers of homochiral (pR)5‐c‐PrS[5]Me pseudorotaxanes are formed. [ABSTRACT FROM AUTHOR]

Published
2023
Full Text
View/download PDF

49. Modified carboxymethylcellulose‐based scaffolds as new potential ecofriendly superplasticizers with a retardant effect for mortar: From the synthesis to the application

Author

Capacchione, Clotilde, Partschefeld, Stephan, Osburg, Andrea, Gliubizzi, Rocco, and Gaeta, Carmine

Subjects
Technology, Microscopy, QC120-168.85, Carboxymethylcellulose, Mortar, Superplasticizers, QH201-278.5, Engineering (General). Civil engineering (General), Article, TK1-9971, Descriptive and experimental mechanics, Electrical engineering. Electronics. Nuclear engineering, TA1-2040
Abstract

This article is focused on the research and development of new cellulose ether derivatives as innovative superplasticizers for mortar systems. Several synthetic strategies have been pursued to obtain new compounds to study their properties on cementitious systems as new bio-based additives. The new water-soluble admixtures were synthesized using a complex carboxymethylcellulose-based backbone that was first hydrolyzed and then sulfo-ethylated in the presence of sodium vinyl sulphonate. Starting with a complex biopolymer that is widely known as a thickening agent was very challenging. Only by varying the hydrolysis times and temperatures of the reactions was achieved the aimed goal. The obtained derivatives showed different molecular weight (Mw) and anionic charges on their backbones. An improvement in shear stress and dynamic viscosity values of CEM II 42.5R cement was observed with the samples obtained with a longer time of higher temperature hydrolysis and sulfo-ethylation. Investigations into the chemical nature of the pore solution, calorimetric studies and adsorption experiments clearly showed the ability of carboxymethyl cellulose superplasticizer (CMC SP) to interact with cement grains and influence hydration processes within a 48-h time window, causing a delay in hydration reactions in the samples. The fluidity of the cementitious matrices was ascertained through slump test and preliminary studies of mechanical and flexural strength of the hardened mortar formulated with the new ecological additives yielded values in terms of mechanical properties. Finally, the computed tomography (CT) images completed the investigation of the pore network structure of hardened specimens, highlighting their promising structure porosity.

Published
2021

Catalog

Books, media, physical & digital resources
See catalog results