A5042206429- Surfactants and Colloidal Systems
- Supramolecular Chemistry and Complexes
- Molecular Sensors and Ion Detection
- Chemical Reaction Mechanisms
- Analytical Chemistry and Chromatography
- Photochemistry and Electron Transfer Studies
- Drug Solubulity and Delivery Systems
- Spectroscopy and Quantum Chemical Studies
- Crystallography and molecular interactions
- Protein Interaction Studies and Fluorescence Analysis
- Ionic liquids properties and applications
- Chemical and Physical Properties in Aqueous Solutions
- Chemical Reactions and Mechanisms
- Crystallization and Solubility Studies
- Lipid Membrane Structure and Behavior
- Thermodynamic properties of mixtures
- Organic and Inorganic Chemical Reactions
- Electrostatics and Colloid Interactions
- Chemical Synthesis and Reactions
- Porphyrin and Phthalocyanine Chemistry
- Luminescence and Fluorescent Materials
- Environmental Chemistry and Analysis
- Advanced Polymer Synthesis and Characterization
- Polymer Surface Interaction Studies
- X-ray Diffraction in Crystallography
Universidade de Santiago de Compostela
2016-2025
Center for Research in Molecular Medicine and Chronic Diseases
2012-2021
Universidad de Santiago de Chile
2000-2018
Centro Singular de Investigación en Química Biológica y Materiales Moleculares
2011-2017
Research Centre in Biological Chemistry of Córdoba
2014-2017
Rede de Química e Tecnologia
2016-2017
Universidade de Vigo
2000-2013
University of Lisbon
1998-2011
University of Groningen
2006
University of Algarve
2003
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTEffects of Additives on the Internal Dynamics and Properties Water/AOT/Isooctane MicroemulsionsLuis Garcia-Rio, J. Ramon Leis, Juan C. Mejuto, M. Elena Pena, Emilia IglesiasCite this: Langmuir 1994, 10, 6, 1676–1683Publication Date (Print):June 1, 1994Publication History Published online1 May 2002Published inissue 1 June 1994https://pubs.acs.org/doi/10.1021/la00018a013https://doi.org/10.1021/la00018a013research-articleACS PublicationsRequest reuse...
The interactions between bovine serum albumin (BSA) and gemini surfactants derived from cystine have been investigated were compared with the conventional single-chain surfactant cysteine. influence of stereochemistry on its behavior toward BSA was also investigated, as well effects pH temperature. Electrical conductivity surface tension measurements used to obtain important system parameters such critical aggregation concentration (cac), polymer saturation point (psp), degree ionization...
p-Sulfonatocalixarenes are a special class of water soluble macrocyclic molecules made 4-hydroxybenzenesulfonate units linked by methylene bridges. One the main features these compounds relies on their ability to form inclusion complexes with cationic and neutral species. This feature, together solubility apparent biological compatibility, had enabled them emerge as one most important host receptors in supramolecular chemistry. Attachment hydrophobic alkyl chains leads formation amphiphilic...
Phosphate diester hydrolysis is strongly accelerated, by a factor of 104, in the presence artificial enzymes especially designed light spatiotemporal concepts, anchoring imidazoles pillar[5]arene matrix. Host:guest complexes cleave aryl phosphodiesters via nucleophilic attack properly placed imidazole moieties with release 2,4-dinitrophenolate and formation unstable phosphoroamidates that regenerate catalyst 2,4-dinitrophenyl phosphate. Comparison reactivity P5IMD shows 270-fold increase....
The mixed system between p-sulfonatocalix[4]arene and tetradecyltrimethylammonium bromide forms unilamellar vesicles after sonication of the aqueous dispersion. Furthermore these can be stored, without use lyoprotectants, by lyophilization then rehydration change in size or shape.
To understand the analogies and differences between cucurbituril cyclodextrin cavities different solvolytic reactions have been studied in presence of cucurbit[7]uril, CB7, β-CD or its methylated derivative, DM-β-CD. Solvolysis 1-bromoadamantane has used as a test to evaluate ability solvate Br− leaving group. Obtained results show that both cases polarity inside cavity is similar 70% ethanol:water mixture. substituted benzoyl chlorides shows great difference CB7 DM-β-CD cavity. electron...
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTTransfer of the nitroso group in water/AOT/isooctane microemulsions: intrinsic and apparent reactivityLuis Garcia-Rio, J. Ramon Leis, M. Elena Pena, Emilia IglesiasCite this: Phys. Chem. 1993, 97, 13, 3437–3442Publication Date (Print):April 1, 1993Publication History Published online1 May 2002Published inissue 1 April 1993https://pubs.acs.org/doi/10.1021/j100115a057https://doi.org/10.1021/j100115a057research-articleACS PublicationsRequest reuse...
Gather together: The host–guest complex formed by a calix[6]arene and the cationic surfactant dodecyltrimethylammonium bromide (DTABr) self-aggregates at lower concentrations than pure surfactant. This result is explained in terms of properties its propensity for self-aggregation to form micelles.
The self-aggregation of five amphiphilic p-sulfonatocalix[n]arenes bearing alkyl chains at the lower rim was investigated by NMR spectroscopy and electrical conductivity. critical micelle concentration determined, tendency this special class surfactants to self-aggregate in aqueous solution analyzed as a function chain length number aromatic units macrocyclic ring. structure monomeric micellized states elucidated means (1)H and, case calix[6]arene derivative, with 2D experiments. While all...
In this work, we have studied the interactions between water-soluble p-sulfonatocalix[6]arene and cationic surfactants octyltrimethylammonium bromide below cmc dodecyltrimethylammonium above cmc, by saturation transfer difference (STD) NMR spectroscopy. From STD build-up curves, obtained T1 independent cross relaxation rates, results show that established headgroup of surfactant OMe group macrocycle play an important role in stabilization complex, both cmc.
Abstract A microcalorimetric study on the inclusion of monovalent and divalent metal cations by p ‐sulfonatocalix[4]arene was performed. The thermodynamic parameters for complexation alkali Ag + were obtained first time at neutral pH. Na cation is routinely present as counterion calixarene in aqueous solution, this must be taken into account determination other considering a sequential or competitive binding scheme. Δ H ° S values show that process entropically driven, although an influence...
The mixed micelle formation in basic aqueous solutions between an anionic gemini amino acid-based surfactant derived from cysteine (C8Cys)2 and the bile salts sodium cholate (NaC) deoxycholate (NaDC) has been studied by conductivity, results have compared with ones obtained for binary of conventional dodecyl sulfate (SDS). A nonideal mixing pattern was observed systems, a striking behavior found surfactant–bile salt mixtures, gemini–bile interactions changing synergistic to antagonistic...
Abstract We present a simple procedure for the synthesis of quasi‐spherical Au nanoparticles in wide size range mediated by macrocyclic host molecules, ammonium pillar[5]arene (AP[5]A). The strategy is based on seeded growth process which water‐soluble undergoes complexation salt through groups, thereby avoiding nucleation, while acting as stabilizer. presence onto nanoparticle particle surface demonstrated surface‐enhanced Raman scattering (SERS) spectroscopy, and most probable conformation...
The self-aggregation behavior of the double-chained ionic liquid (IL) 1,3-didecyl-2-methylimidazolium chloride ([C10C10mim]Cl) in aqueous solution has been investigated with a number different experimental techniques. Two cmc values (cmc1 and cmc2) are obtained from conductivity measurements. fraction neutralized charge on micellar surface suggests that cmc1 corresponds to formation spherical micelles cmc2 transition cylindrical micelles. Data fluorescence spectroscopy (using pyrene Nile red...
Phosphate ester destabilization inside pillar[5]arene due to disrupting the H-bonding water speed its hydrolysis reaction.
Novel plasmonic thin films based on electrostatic layer-by-layer (LbL) deposition of citrate-stabilized Au nanoparticles (NPs) and ammonium pillar[5]arene (AP[5]A) have been developed. The supramolecular-induced LbL assembly the yields formation controlled hot spots with uniform interparticle distances. At same time, this strategy allows modulating density dimensions aggregates, therefore optical response, film number AuNP-AP[5]A cycles. Characterization hybrid platforms as a function cycles...
Cucurbit[7]uril (CB7) catalyzes the acid hydrolysis of alkoxyphenyldioxolanes bearing both neutral and cationic alkoxy groups. The magnitude catalytic effect depends on dioxolane structure, as reflected by CB7 binding constants catalysis rate constants. However, there is no clear relationship in such a way that increasing affinity (cationic dioxolanes or large groups) does not enhance effect. A-1 mechanism for involves protonation formation carbocation protonated ring opening. Supramolecular...
The formation of host–guest complexes between seven flavylium cations and water-soluble p-sulfonatocalix[4]arene (SC4) was investigated by UV/vis absorption, fluorescence, NMR spectroscopies. results show the cationic guests form with affinities in submillimolar range. A representative chalcone/flavylium photoswitch more detail regarding its pH- light-triggered interconversion two forms. dramatic affinity differentiation SC4 binding switchable species (40 M–1 for trans-chalcone versus 3.5 ×...
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTInfluence of Water Structure on Solvolysis in Water-in-Oil MicroemulsionsL. Garcia-Rio, J. R. Leis, and E. IglesiasCite this: Phys. Chem. 1995, 99, 32, 12318–12326Publication Date (Print):August 1, 1995Publication History Published online1 May 2002Published inissue 1 August 1995https://pubs.acs.org/doi/10.1021/j100032a041https://doi.org/10.1021/j100032a041research-articleACS PublicationsRequest reuse permissionsArticle...
The formation of mixed micelles composed dodecyltrimethylammonium bromide (C(12)TAB) and a hexamethylated p-sulfonatocalix[6]arene (SC6HM) was studied by several techniques. It found that above the critical aggregation concentration concentrations free micellized surfactant are strongly related to SC6HM. When there is SC6HM in solution, addition C(12)TAB mainly results an increase surfactant, but when all has been aggregated, substantial solution. equal micelle pure system, second...