Author
Roberto Palombari
Bio: Roberto Palombari is an academic researcher. The author has contributed to research in topics: Equilibrium constant & Thiocyanate. The author has an hindex of 4, co-authored 10 publications receiving 126 citations.
Papers
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TL;DR: In this paper, the equilibrium between Cu2+, copper metal and Cu+ ion has been studied, at 25°C in a series of (Na)ClO4 as well as (Na2)SO4 ionic media, by passing Cu2+ solutions through a column of finely divided copper metal In the effluent liquid phase, which was made to percolate at a rate low enough for equilibrium to be attained, the number of equivalents of reducing agent was determined by constant current coulometry.
67 citations
TL;DR: In this paper, the equilibria of dioxouranium (VI) and carbonate ions in acid solution (log [H+] > −5) have been studied at 25°C by measuring, with a glass electrode, the hydrogen ion concentration of a series of UO2−2+ perchlorate solutions, saturated with CO2(g) at known partial pressure.
40 citations
TL;DR: In this article, the effect of the ionic environment on acid-base indicators is accounted for by using the specific interaction theory (SIT) of Broensted, Scatchard, and Guggenheim.
Abstract: The effect of the ionic environment on the dissociation constant of acid-base indicators is accounted for by using the specific interaction theory (SIT) of Broensted, Scatchard, and Guggenheim. It is shown that the SIT may be applied to evaluate the activity coefficients of organic ions, regardless of their size and structure, if suitable modifications are introduced.
10 citations
TL;DR: In this article, the entropy changes for the stepwise formation of the chloride, thiocyanate and mononuclear hydroxo complexes of the mercury(II) ion have been determined at 25·00°C, in 1 M NaClO4 ionic medium, by a direct calorimetric titration procedure.
6 citations
TL;DR: In this paper, the equilibria between Mn3+ and phosphate ions have been studied, at 25°C in 3M(Li+, H+)ClO4− media, by measuring the potential of the Mn 3+Mn2+ half-cell at a series of [H+] as a function of the [H3PO4] and of the[Mn(III)].
4 citations
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TL;DR: Huisgen's 1,3-dipolar cycloadditions become nonconcerted when copper(I) acetylides react with azides and nitrile oxides, providing ready access to 1,4-disubstituted 1,2, 3-triazoles and 3, 4-disubsided isoxazoles, respectively.
Abstract: Huisgen's 1,3-dipolar cycloadditions become nonconcerted when copper(I) acetylides react with azides and nitrile oxides, providing ready access to 1,4-disubstituted 1,2,3-triazoles and 3,4-disubstituted isoxazoles, respectively. The process is highly reliable and exhibits an unusually wide scope with respect to both components. Computational studies revealed a stepwise mechanism involving unprecedented metallacycle intermediates, which appear to be common for a variety of dipoles.
1,486 citations
TL;DR: “Green”
Abstract: Chemical Reviews is published by the American Chemical Society. 1155 Sixteenth Street N.W., Washington, DC 20036 “Green” Atom Transfer Radical Polymerization: From Process Design to Preparation of Well-Defined Environmentally Friendly Polymeric Materials Nicolay V. Tsarevsky, and Krzysztof Matyjaszewski Chem. Rev., 2007, 107 (6), 2270-2299• DOI: 10.1021/cr050947p • Publication Date (Web): 27 May 2007 Downloaded from http://pubs.acs.org on April 2, 2009
1,150 citations
TL;DR: It is reported that polarsolvents such as H(2)O, alcohols, dipolar aprotic solvents, ethylene and propylene carbonate, and ionic liquids instantaneously disproportionate Cu(I)X into Cu(0) and Cu(II)X(2), facilitating an ultrafast LRP in which the free radicals are generated by the nascent and extremely reactive Cu( 0) atomic species.
Abstract: Conventional metal-catalyzed organic radical reactions and living radical polymerizations (LRP) performed in nonpolar solvents, including atom-transfer radical polymerization (ATRP), proceed by an inner-sphere electron-transfer mechanism. One catalytic system frequently used in these polymerizations is based on Cu(I)X species and N-containing ligands. Here, it is reported that polar solvents such as H(2)O, alcohols, dipolar aprotic solvents, ethylene and propylene carbonate, and ionic liquids instantaneously disproportionate Cu(I)X into Cu(0) and Cu(II)X(2) species in the presence of a diversity of N-containing ligands. This disproportionation facilitates an ultrafast LRP in which the free radicals are generated by the nascent and extremely reactive Cu(0) atomic species, while their deactivation is mediated by the nascent Cu(II)X(2) species. Both steps proceed by a low activation energy outer-sphere single-electron-transfer (SET) mechanism. The resulting SET-LRP process is activated by a catalytic amount of the electron-donor Cu(0), Cu(2)Se, Cu(2)Te, Cu(2)S, or Cu(2)O species, not by Cu(I)X. This process provides, at room temperature and below, an ultrafast synthesis of ultrahigh molecular weight polymers from functional monomers containing electron-withdrawing groups such as acrylates, methacrylates, and vinyl chloride, initiated with alkyl halides, sulfonyl halides, and N-halides.
1,058 citations
TL;DR: In this article, the authors present the latest progress in two related polymerization methodologies that rely on singleelectron transfer (SET), single-electron-transfer degenerative chain transfer living radical polymerization (SET-DTLRP), and single-Electron Transfer Living Radical Poly(SET-LRP) for the synthesis of tailored polymers.
Abstract: The special of Chemical Review informs about studies conducted on single-electron transfer and single-electron transfer degenerative chain transfer living radical polymerization. Researchers have demonstrated that living radical polymerization (LRP) can be significantly effective for the synthesis of tailored polymers. The special issue aims at covering the latest progress in two related polymerization methodologies that rely on single-electron transfer (SET), single-electron transfer degenerative chain transfer living radical polymerization (SET-DTLRP), and single-electron transfer living radical polymerization (SET-LRP). It is demonstrated that SET-DTLRP proceeds through SET initiation and competition of SET activation, deactivation, and degenerative transfer (DT). SET-LRP proceeds exclusively through a SET initiation, activation, and deactivation. It is also revealed that the two techniques have arose from investigations into Cu-catalyzed LRP initiated with sulfonyl halides.
814 citations
TL;DR: The room-temperature living radical polymerization (LRP) of vinyl chloride in H2O/THF in the presence of Cu0 or CuI salts as catalysts, tren or PEI as ligands, and iodoform as initiator is described.
Abstract: This paper describes the room-temperature living radical polymerization (LRP) of vinyl chloride in H2O/THF in the presence of Cu0 or CuI salts as catalysts, tren or PEI as ligands, and iodoform as initiator. The disproportionation reaction 2CuI + L → Cu0 + CuII(L) is the crucial step, as it continuously provides the active species for both the initiation (Cu0) and the reversible termination step (CuII). Mn was found to increase linearly with conversion and is in good agreement with Mth, with the Mw/Mn being approximately 1.5.
400 citations