A5062248011- Chemical Thermodynamics and Molecular Structure
- Ionic liquids properties and applications
- Crystallization and Solubility Studies
- X-ray Diffraction in Crystallography
- Phase Equilibria and Thermodynamics
- Chemical and Physical Properties in Aqueous Solutions
- Thermal and Kinetic Analysis
- Free Radicals and Antioxidants
- Electrochemical Analysis and Applications
- Thermodynamic properties of mixtures
- Catalysis and Oxidation Reactions
- thermodynamics and calorimetric analyses
- Crystal structures of chemical compounds
- Crystallography and molecular interactions
- Advanced Chemical Physics Studies
- Analytical Chemistry and Chromatography
- Adsorption, diffusion, and thermodynamic properties of materials
- Metal complexes synthesis and properties
- Synthesis and biological activity
- Surfactants and Colloidal Systems
- Chemistry and Chemical Engineering
- Molecular Junctions and Nanostructures
- Inorganic and Organometallic Chemistry
- Structural and Chemical Analysis of Organic and Inorganic Compounds
- Photochemistry and Electron Transfer Studies
Universidade do Porto
2016-2025
Faculdade de Tecnologia e Ciências
2023
Fernando Pessoa University
2006-2019
Universidade Federal de Sergipe
2018
University of Aveiro
2005-2016
Universidade Nova de Lisboa
2006-2010
Universidade Estadual de Campinas (UNICAMP)
2009
Universidade de Santiago de Compostela
2009
National Institute of Standards and Technology
2009
Rede de Química e Tecnologia
2009
The ionic nature of liquids (ILs) results in a unique combination intrinsic properties that produces increasing interest the research these fluids as environmentally friendly "neoteric" solvents. One main fields is their exploitation solvents for liquid-liquid extractions, but although ILs cannot vaporize leading to air pollution, they present non-negligible miscibility with water may be cause some environmental aquatic risks. It thus important know mutual solubilities between and before...
Ionic liquids (ILs) have recently garnered increased attention because of their potential environmental benefits as "green" replacements over conventional volatile organic solvents. While ILs cannot significantly volatilize and contribute to air pollution, even the most hydrophobic ones present some miscibility with water posing risks aquatic ecosystems. Thus, knowledge toxicity solubility must be assessed before an accurate judgment prior industrial applications. In this work, mutual...
Among new potential solvents for lignocellulosic materials, ionic liquids (ILs) are attracting considerable attention. Hence, the knowledge of thermophysical properties such fluids is essential design related industrial processes. Therefore, in this work, a set properties, namely, density, viscosity, and refractive index, as function temperature, isobaric thermal expansivity heat capacities at constant were determined eight with 1-ethyl-3-methylimidazolium cation combined following anions:...
Electrospray ionization mass spectrometry with variable collision induced dissociation of the isolated [(cation)(2)anion](+) and/or [(anion)(2)cation](-) ions imidazolium-, pyridinium-, pyrrolidinium-, and piperidinium-based ionic liquids (ILs) combined a large set anions, such as chloride, tetrafluoroborate, hexafluorophosphate, trifluoromethanesulfonate, bis[(trifluoromethyl)sulfonyl]imide, was used to carry out systematic comprehensive study on relative interaction energies. The results...
Aiming at evaluating the impact of cation symmetry on nanostructuration ionic liquids (ILs), in this work, densities and viscosities as a function temperature small-wide angle X-ray scattering (SWAXS) patterns ambient conditions were determined analyzed for 1-alkyl-3-methylimidazolium bis(trifluoromethylsulfonyl)imide (asymmetric) 1,3-dialkylimidazolium (symmetric) series liquids. The symmetric IL series, [CN/2CN/2im][NTf2], presents lower than asymmetric [CN-1C1im][NTf2] counterparts. For...
Molar enthalpies of vaporization, a homologous series 1-alkyl-3-methylimidazolium bis(trifluoromethyl sulfonyl)imides, [Cnmim][NTf2], (with 2 ≤ n 8) were directly determined for the first time. The results obtained in this study emphasize and constitute clear experimental support novel concept that these liquid salts are composed polar nonpolar domains; is, they exhibit microphase segregation.
Despite the recent increase in number of works addressing effect water on thermophysical properties ionic liquids (ILs), particular densities and viscosities, strong content region low these requires further study for a deeper understanding phenomenon. Densities viscosities two imidazolium-based liquids, 1-butyl-3-methylimidazolium dicyanamide [C4mim][N(CN)2] tricyanomethane [C4mim][C(CN)3], their binaries with water, mole fractions up to 0.6, at atmospheric pressure temperatures from...
For the first time, two distinct trends are clearly evidenced for enthalpies and entropies of vaporization along [Cnmim][Ntf2] ILs series. The trend shifts observed Δ(l)(g)H(m)(o) Δ(l)(g)S(m)(o), which occur at [C6mim][Ntf2], related to structural modifications. thermodynamic results reported in present article constitute quantitative experimental evidence percolation phenomenon make a significant contribution better understanding relationship among cohesive energies, volatilities, liquid...
New classes of acidic or basic ionic liquids (ILs) are gaining special attention, since the efficiency many processes can be enhanced by judicious manipulation these properties. The absorption sour gases character IL. fluorination cation anion also contribute to enhance gas solubility. In this work two characteristics evaluated through study gas-liquid equilibrium based on similar anions, 1-butyl-3-methylimidazolium acetate ([C4mim][Ac]) and trifluoroacetate ([C4mim][TFA]), with carbon...
Ion specific effects on the mutual solubilities between hydrophobic ionic liquids (ILs) and water are complex not fully understood. The aim of this work is to obtain further evidence about molecular mechanism behind phenomenon by evaluating effect a large series inorganic organic salts liquid 1-butyl-3-methylimidazolium bis(trifluoromethylsulfonyl)imide, [C(4)mim][Tf(2)N]. magnitudes salting-in salting-out were assessed changing either cation or anion, in salts, as well salt concentration....
A new static apparatus, capable of measuring vapor pressures in the range (0.4 to 133) Pa and temperature (243 413) K, is fully described. The performance apparatus was checked by four compounds recommended as reference materials for measurement pressurenaphthalene, benzoic acid, benzophenone, ferrocene. value enthalpy sublimation (298.15 K) = (95.1 ± 1.9) kJ·mol-1, suggested.
Abstract The outcome of the Suzuki–Miyaura cross‐coupling for direct competition reaction between two boronic acids was evaluated under routine synthesis conditions. selectivity found to depend on amount base used, with fewer bases favoring reactivity acid lower p K a (stronger acid). dependence stoichiometry increase in difference values competing acids. These results confirm relationship acid–base chemistry and catalytic cycle. Moreover, indicate that these specific conditions, most...
The solubility of water in tetradecyltrihexylphosphonium-based ionic liquids (ILs) with the bromide, bis(trifluoromethylsulfonyl)imide, bis(2,4,4-trimethylpentyl)phosphinate, chloride, decanoate, and dicyanimide anions was measured at temperatures between (288.15 318.15) K atmospheric pressure. effect nature IL anion, as well influence temperature, are analyzed discussed. From experimental results, it found that anion-induced hydrophobicity increases from...
By employing 1H NMR spectroscopy and molecular simulations, we provide an explanation for recent observations that the aqueous solubilities of ionic liquids exhibit salting-out to salting-in regimes upon addition distinct inorganic salt ions. Using a typical liquid [1-butyl-3-methylimidazolium bis(trifluoromethylsulfonyl)imide], observed existence preferential specific interactions between low electrical charge density ("apolar moiety") parts cation salts. These priori unexpected become...