1,721,004 research outputs found
Pyrrolyl and quinolinonyl derivatives as novel anti-HIV agents targeted to the ribonuclease H function of the HIV-1 reverse transcriptase enzyme
No full textSynthesis and Properties of Calix[n]arene Receptors for the Preparation of “Active” Organic-Inorganic Hybrid Materials
No full textSupramolecular chemistry principles, in particular the calix[n]arene unit with its specific and functional properties were used to design and improve the characteristics of new hybrid materials like gold based MPCs. In this thesis was studied the factors necessary to gain the full control on the synthesis and characterization of these new functional devices characterized by a calix[n]arene organic shell. As second step were tested the recognition and self-assembly properties in solution towards bypiridine based cation spacers acting as guests for the calix[n]arene cavity. All the knowledges obtained from these studies were useful to translate our calix[n]arene based functional systems from solution to inorganic surfaces like polycrystalline Cu and Si(100). Our calix[n]arene based molecular devices were successfully anchored on these inorganic surfaces and their complexing capabilities were tested with good results through X-ray photoelectron spectroscopy (XPS).I principi di chimica supramolecolare, in particolare l’unità calix[n]arenica con le sue specifiche proprietà funzionali, sono stati utilizzati per creare e migliorare le caratteristiche di materiali ibridi come ad esempio i monostrati organici a base di oro (Au MPCs). In questa tesi sono stati studiati i fattori necessari per ottenere il pieno controllo sulla sintesi e la caratterizzazione di questi nuovi dispositivi funzionali caratterizzati da un monostrato organico a base calix[n]arenica. Come secondo passaggio sono state esaminate le proprietà di riconoscimento molecolare in soluzione, nei confronti di spaziatori a base bipiridinica. Tutte i risultati e conoscenze ottenuti da questi studi sono stati utili per traslare i sistemi a base calix[n]arenica finora creati, dalla soluzione a superfici inorganiche come Cu policristallino e Si(100). I recettori a base cali[n]arenica sono stati ancorati con successo su queste superfici inorganiche e le loro capacità complessanti sono state positivamente testate mediante spettroscopia fotoelettronica a raggi X (XPS)
Structural electronic study via XPS and TEM of sub-nanometric gold particles protected by calixarenes
No full textIn the last years, substituted ferrocenes have been investigated as active redox molecules,
able to tune the response of a functionalized electrode (especially gold and silicon) on which they are adsorbed, due to their attractive electrochemical characteristics: fast electron-transfer rate, low oxidation potential, and two stable redox states [1]. Ferrocene derivatives present also the advantage of a facile tunability of their redox potential via substitution of one or more H atoms of the cyclopentadyenil (Cp) ring with distinct functional groups.
We present the results of an experimental and theoretical investigation on pure ethyl-, vinyl and ethynylferrocene in the gas phase by means of NEXAFS at the C K-edge, and XPS of the C 1s region, and by DFT calculations. Such a combination probes both the state of charge of the C atoms of the substituent group of the three molecules, and the extent of conjugation of the C-C arm with the Cp ring. A reliable assignment of the characteristic NEXAFS features associated to double and triple C-C bond of the lateral substituents of such closely related molecules may offer the fingerprint of the preservation or loss of the unsaturation in the anchoring arm upon its reaction with a surface, as well as shed light on the reaction mechanism for the surface anchoring on Si with different recipes, which is an actively investigated, yet still open, issue
PIRROLIL-IDROSSAMMATI PER USO NELLA PREVENZIONE E/O NEL TRATTAMENTO DI INFEZIONI BATTERICHE
No full textUNA SERIE DI COMPOSTI CHIMICI IN FOMA INSATURA E SATURA IN ZINCO NELLA PREVENZIONE E CURA DI INFEZIONI BATTERICH
Pyrrolyl-Hydroxamates for use in the prevention and/or treatment of bacterial infections
No full textCalix[4]arene receptors and rotaxanes on Si(100) and Cu surfaces: synthesis and characterization
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