A5082577918- Chemical and Physical Properties in Aqueous Solutions
- Electrochemical Analysis and Applications
- Chemical Thermodynamics and Molecular Structure
- Thermodynamic properties of mixtures
- Molecular Sensors and Ion Detection
- Thermal and Kinetic Analysis
- Analytical chemistry methods development
- Spectroscopy and Quantum Chemical Studies
- Radioactive element chemistry and processing
- Inorganic and Organometallic Chemistry
- Arsenic contamination and mitigation
- Organometallic Compounds Synthesis and Characterization
- Analytical Chemistry and Chromatography
- Crystallization and Solubility Studies
- Ionic liquids properties and applications
- Corrosion Behavior and Inhibition
- Analytical Chemistry and Sensors
- Free Radicals and Antioxidants
- Chemical Synthesis and Characterization
- Metal complexes synthesis and properties
- Biochemical effects in animals
- Environmental Chemistry and Analysis
- Fluorine in Organic Chemistry
- Marine Biology and Environmental Chemistry
- Chemical Reaction Mechanisms
University of Messina
2015-2024
Instituto de Ciências Farmacêuticas
2015-2020
Alcon (China)
2018
Ab Analitica (Italy)
2006
University of Palermo
1996-2002
Norfolk State University
1995-1998
University of Turin
1998
University of Central Florida
1991-1997
North Carolina State University
1997
This paper describes a modified version of the SIT (Specific ion Interaction Theory) method and its use in determining dependence on ionic strength activity coefficients. In new approach interaction coefficients (ε) are not constant but depend (I /mol kg-1) according to simple relationship:ε = ε∞+ (ε0 - ε∞) / (l + 1)where ε0 true constants for I→ 0 l→ ∞, respectively. To check two parameter equation, we calculated HCl, LiCl, NaCl, KCl, MgCl2, CaCl2 SrCl2, wide range (0.1 ≤ l/mol kg-1 4.5,...
The solubility of three dicarboxylic acids, (COOH)−(CH2)n−(COOH) (n = 6, 7, 8), was determined in NaCl(aq) (0.5 to 4.5) mol·L-1, (CH3)4NCl(aq) (0.25 3) (C2H5)4NI 1) and pure water at t 25 °C. trend is > (CH3)4NCl NaCl. Setschenow constants activity coefficients neutral species were calculated from these data. To fully characterize the acid−base behavior above protonation same conditions. From data, together with ones, Pitzer SIT parameters calculated.
A potentiometric and 1H NMR investigation on the interactions between Hg2+ some biologically important sulfhydryl ligands, such as cysteine (H2CYS), penicillamine (H2PSH), glutathione (H3GSH), is reported. Equilibria were studied at T = 298.15 K, in ionic strength range (0.1 to 1) mol·kg–1, using medium NaCl presence of iodide (NaI) a competitive ligand. Results show formation HgL2–z, HgLH3–z, HgLH24–z, HgL22–2z, HgL2H3–2z, HgL2H24–2z species (Lz– CYS2–, PSH2–, or GSH3–) together with...
The acid–base properties of dopamine were studied in different experimental conditions by potentiometry, UV-spectrophotometry, and spectrofluorimetry. distribution measurements between 2-methyl-1-propanol/pure water (or NaCl aqueous solutions up to I = 1.02 mol kg–1) carried out at T 298.15 K 310.15 K. potentiometric used calculate the total concentration ligand each phase, from simple mass balance equations, using free hydrogen protonation constants, it was possible neutral species...
A thermodynamic picture is reported for cys–Pb<sup>2+</sup>, psh–Pb<sup>2+</sup>, gsh–Pb<sup>2+</sup>, and gsh–Zn<sup>2+</sup>systems, equilibrium constants can be predicted any experimental condition.
By combining <italic>ab initio</italic> molecular dynamics simulations and experiments, the stable hydrolytic species formed by As<sup>3+</sup> As<sup>5+</sup> have been identified both in natural waters biologically relevant systems.
The hydrolysis of (CH3)2Sn2+ was studied potentiometrically, in different aqueous media (sodium and tetramethylammonium chlorides, sodium nitrate, perchlorate, sulfate), a wide range ionic strength, at t = 25 °C. Least squares calculations are consistent with the formation species [M(OH)]+, [M(OH)2]0, [M(OH)3]-, [M2(OH)2]2+, [M2(OH)3]+, M (CH3)2Sn2+. dependence on strength for salt solutions taken into account by using Debye−Hückel type equation. Medium effects were explained considering...
A study on chemical equilibria of different Hg2+−organic ligand systems is reported to establish the sequestration power N/O donor groups versus metal. Ligand classes considered are: O-donors (succinate, 1,2,3,4-butanetetracarboxylate, 1,2,3,4,5,6-benzenehexacarboxylate, polymethacrylate, and polyacrylates); N-donors (ethylenediamine, diethylenetriamine, spermidine, triethylentetramine, tetraethylenpentamine, poly(allylamine), poly(ethylenimine)); amino acids (glycine, histidine, aspartic...
The protonation enthalpies of some polycarboxylate anions (malonate, citrate, 1,2,3-propanetricarboxylate, and 1,2,3,4-butanetetracarboxylate) were studied calorimetrically at different ionic strengths, 1 ≤ I 5 mol kg-1 , in NaCl aqueous solutions. Some potentiometric measurements also made 15 55 °C. Both calorimetric data (including previously reported data) used to obtain complete sets ΔG, ΔH, TΔS values for the carboxylate anions. dependence ΔH on strength was modeled by simple linear...
Replacing carboxylic with phosphonic groups in NTA significantly affects the sequestering ability toward Hg<sup>2+</sup>, CH<sub>3</sub>Hg<sup>+</sup>, Sn<sup>2+</sup> and (CH<sub>3</sub>)<sub>2</sub>Sn<sup>2+</sup>.