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M. O. Lépori C, Soledad Orellano M, Mariano Correa N, Silber JJ, Darío Falcone R. Understanding the interfacial properties of bmim-AOT reverse micelles for their application as nanoreactors. J Mol Liq 2022. [DOI: 10.1016/j.molliq.2022.120238] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/31/2022]
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2
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Sensitive and Rapid Detection of Glutamic Acid in Colloidal Solution by Surfactant Mediated Silver Nanoparticles. J CLUST SCI 2022. [DOI: 10.1007/s10876-021-02066-9] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/21/2022]
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3
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Harada M, Sakai H, Fukunaga Y, Okada T. Hydration of bromide at reverse micelle interfaces studied by X-ray absorption fine structure. J Colloid Interface Sci 2021; 599:79-87. [PMID: 33933799 DOI: 10.1016/j.jcis.2021.04.070] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/24/2021] [Revised: 04/12/2021] [Accepted: 04/13/2021] [Indexed: 10/21/2022]
Abstract
Nanoconfined water exhibits various interesting properties, which are not only of fundamental importance but also of practical use. Because reverse micelles (RMs) provide versatile ways to prepare nanoconfined water, the understanding of their physicochemical properties is essential for developing efficient applications. Although the water properties in the RMs could be affected by its interaction with the RM interface, the details have not been well understood. This study focuses on the local structures of Br- in hexadecyltrimethylammonium bromide (HTAB) RMs formed in chloroform and 10% hexanol/heptane. The dependence in Br- hydration on the molar ratio of water to HTAB (w) is investigated using X-ray absorption fine structure (XAFS). These systems cover a wide range of w values (0-30) and allow us to study the impact of this parameter on the local structure of Br- at the RM interface, which comprises water, surfactant headgroups, and organic solvent components. The presence of multiple scattering paths complicates the XAFS spectra and makes it difficult to analyze them using standard fitting methods. The linear combination of the spectra corresponding to the individual scattering paths captures the molecular processes that occur at the RM interface upon increasing w. The maximum hydration number of Br- is found to be 4.5 at w > 15, suggesting that although most of the ions remain at the interface as partly hydrated ions, some of them dissociate as completely hydrated ones.
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Affiliation(s)
- Makoto Harada
- Department of Chemistry, Tokyo Institute of Technology, Meguro-ku, Tokyo 152-8551, Japan.
| | - Hinako Sakai
- Department of Chemistry, Tokyo Institute of Technology, Meguro-ku, Tokyo 152-8551, Japan
| | - Yu Fukunaga
- Department of Chemistry, Tokyo Institute of Technology, Meguro-ku, Tokyo 152-8551, Japan
| | - Tetsuo Okada
- Department of Chemistry, Tokyo Institute of Technology, Meguro-ku, Tokyo 152-8551, Japan.
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4
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Karanth S, Iyyaswami R. Mixed Surfactant‐Based Reverse Micellar Extraction Studies of Bovine Lactoperoxidase. J SURFACTANTS DETERG 2021. [DOI: 10.1002/jsde.12489] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Affiliation(s)
- Shwetha Karanth
- Department of Chemical Engineering National Institute of Technology Karnataka Surathkal Mangalore 575025 India
| | - Regupathi Iyyaswami
- Department of Chemical Engineering National Institute of Technology Karnataka Surathkal Mangalore 575025 India
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5
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Doucette KA, Chaiyasit P, Calkins DL, Martinez KN, Van Cleave C, Knebel CA, Tongraar A, Crans DC. The Interfacial Interactions of Glycine and Short Glycine Peptides in Model Membrane Systems. Int J Mol Sci 2020; 22:ijms22010162. [PMID: 33375246 PMCID: PMC7795424 DOI: 10.3390/ijms22010162] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/30/2020] [Revised: 12/19/2020] [Accepted: 12/22/2020] [Indexed: 12/20/2022] Open
Abstract
The interactions of amino acids and peptides at model membrane interfaces have considerable implications for biological functions, with the ability to act as chemical messengers, hormones, neurotransmitters, and even as antibiotics and anticancer agents. In this study, glycine and the short glycine peptides diglycine, triglycine, and tetraglycine are studied with regards to their interactions at the model membrane interface of Aerosol-OT (AOT) reverse micelles via 1H NMR spectroscopy, dynamic light scattering (DLS), and Langmuir trough measurements. It was found that with the exception of monomeric glycine, the peptides prefer to associate between the interface and bulk water pool of the reverse micelle. Monomeric glycine, however, resides with the N-terminus in the ordered interstitial water (stern layer) and the C-terminus located in the bulk water pool of the reverse micelle.
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Affiliation(s)
- Kaitlin A. Doucette
- Cell and Molecular Biology Program, Colorado State University, Fort Collins, CO 80523, USA;
- Department of Chemistry, Colorado State University, Fort Collins, CO 80523, USA; (D.L.C.); (K.N.M.); (C.V.C.); (C.A.K.)
| | - Prangthong Chaiyasit
- School of Chemistry, Institute of Science, Suranaree University of Technology, Nakhon Ratchasima 30000, Thailand; (P.C.); (A.T.)
| | - Donn L. Calkins
- Department of Chemistry, Colorado State University, Fort Collins, CO 80523, USA; (D.L.C.); (K.N.M.); (C.V.C.); (C.A.K.)
| | - Kayli N. Martinez
- Department of Chemistry, Colorado State University, Fort Collins, CO 80523, USA; (D.L.C.); (K.N.M.); (C.V.C.); (C.A.K.)
| | - Cameron Van Cleave
- Department of Chemistry, Colorado State University, Fort Collins, CO 80523, USA; (D.L.C.); (K.N.M.); (C.V.C.); (C.A.K.)
| | - Callan A. Knebel
- Department of Chemistry, Colorado State University, Fort Collins, CO 80523, USA; (D.L.C.); (K.N.M.); (C.V.C.); (C.A.K.)
| | - Anan Tongraar
- School of Chemistry, Institute of Science, Suranaree University of Technology, Nakhon Ratchasima 30000, Thailand; (P.C.); (A.T.)
| | - Debbie C. Crans
- Cell and Molecular Biology Program, Colorado State University, Fort Collins, CO 80523, USA;
- Department of Chemistry, Colorado State University, Fort Collins, CO 80523, USA; (D.L.C.); (K.N.M.); (C.V.C.); (C.A.K.)
- Correspondence: ; Tel.: +1-970-491-7635
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6
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Sakai H, Harada M, Okada T. Reverse micelle chromatography for evaluation of partition of organic solutes to micellar pseudophases. J Colloid Interface Sci 2020; 577:191-198. [DOI: 10.1016/j.jcis.2020.05.074] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/16/2020] [Revised: 05/18/2020] [Accepted: 05/18/2020] [Indexed: 10/24/2022]
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7
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Siddiqui A, Anwar H, Ahmed SW, Naqvi S, Shah MR, Ahmed A, Ali SA. Synthesis and sensitive detection of doxycycline with sodium bis 2-ethylhexylsulfosuccinate based silver nanoparticle. SPECTROCHIMICA ACTA. PART A, MOLECULAR AND BIOMOLECULAR SPECTROSCOPY 2020; 225:117489. [PMID: 31476646 DOI: 10.1016/j.saa.2019.117489] [Citation(s) in RCA: 16] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/10/2019] [Revised: 07/23/2019] [Accepted: 08/25/2019] [Indexed: 06/10/2023]
Abstract
The monitoring of residual antibiotics in the environment has gained a significant importance for the effective control, because of the high risk to human health. A simple strategy was designed for the green synthesis and detection of doxycycline (Dox) by using anionic surfactant sodium bis 2-ethylhexylsulfosuccinate based silver nanoparticles (AOT-AgNPs). The chemical reduction and capping of Ag+1 ions was achieved by sulfonyl and carbonyl functional groups of AOT molecule. The AOT-AgNPs were found to have excellent stability at variable environmental parameters (i.e. temperature, storage period, salt concentration and pH) possibly due to the strong emulsifying nature of the surfactant. Mechanism of interaction between the AOT-AgNPs and Dox was established with UV/visible, Fourier transform infrared (FTIR) spectroscopy, Atomic force microscopy (AFM) and Dynamic light scattering (DLS) techniques, which suggests the interaction via aggregates formation. The synthesize probe could detect the Dox within 15 min over a wide range of concentrations from 0.1 to 140μM with limit of detection (LOD) of 0.2 μM. As proof of strategy, we have illustrated that the AOT-AgNPs also detect Dox in biological and environmental samples with negligible interference and very significant recovery rates. Moreover, non-toxic nature against various tested cell lines (i.e. normal mouse fibroblast (NIH-3 T3) and cancerous non-small lung carcinoma (NCI-H460)) and significant antimicrobial, antibiofilm and biofilm eradicating potential of AOT-AgNPs were provide ideal nanomaterial for further applications.
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Affiliation(s)
- Asma Siddiqui
- Department of Chemistry, Federal Urdu University of Arts, Science and Technology, Gulshan-e-Iqbal, Campus Karachi, Karachi, Pakistan
| | - Humera Anwar
- Department of Chemistry, Federal Urdu University of Arts, Science and Technology, Gulshan-e-Iqbal, Campus Karachi, Karachi, Pakistan
| | - Syed Waseem Ahmed
- Department of Chemistry, Federal Urdu University of Arts, Science and Technology, Gulshan-e-Iqbal, Campus Karachi, Karachi, Pakistan; H.E.J. Research Institute of Chemistry, International Center for Chemical and Biological Sciences, University of Karachi, Karachi 75270, Pakistan
| | - Sumra Naqvi
- Department of Chemistry, Federal Urdu University of Arts, Science and Technology, Gulshan-e-Iqbal, Campus Karachi, Karachi, Pakistan
| | - Muhammed Raza Shah
- H.E.J. Research Institute of Chemistry, International Center for Chemical and Biological Sciences, University of Karachi, Karachi 75270, Pakistan
| | - Ayaz Ahmed
- Dr. Panjwani Center for Molecular Medicine and Drug Research, International Center for Chemical and Biological Sciences (ICCBS), University of Karachi, Karachi 75270, Pakistan
| | - Syed Abid Ali
- H.E.J. Research Institute of Chemistry, International Center for Chemical and Biological Sciences, University of Karachi, Karachi 75270, Pakistan.
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8
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Lépori CMO, Correa NM, Silber JJ, Vaca Chávez F, Falcone RD. Interfacial properties modulated by the water confinement in reverse micelles created by the ionic liquid-like surfactant bmim-AOT. SOFT MATTER 2019; 15:947-955. [PMID: 30644504 DOI: 10.1039/c8sm02217h] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/09/2023]
Abstract
The behavior of the interfacial water entrapped in reverse micelles (RMs) that were formed by the ionic liquid-like surfactant 1-butyl-3-methylimidazolium 1,4-bis-2-ethylhexylsulfosuccinate (bmim-AOT) was investigated with the use of UV-Vis absorption spectroscopy and nuclear magnetic resonance (NMR) relaxometry. The solvatochromism of two molecular probes, namely, 1-methyl-8-oxyquinolinium betaine (QB) and N,N,N',N'-tetramethylethylenediamine copper(ii)acetylacetonate tetraphenylborate ([Cu(acac)(tmen)][B(C6H5)4]), was investigated. As a comparison, the analog RMs formed by sodium 1,4-bis-2-ethylhexylsulfosuccinate (Na-AOT) were also explored. By varying the water content inside the RMs and consequently the different magnitude of the water-surfactant interactions at the interface, interesting properties were observed by comparing bmim-AOT and Na-AOT RMs. From the solvatochromic behavior of ([Cu(acac)(tmen)][B(C6H5)4]), we found that the interface in bmim-AOT RMs shows a smaller electron donating capacity than that in Na-AOT RMs. QB revealed that the interfacial region is a weaker hydrogen bond donor and less polar than the corresponding Na-AOT RMs. NMR experiments showed that the molecular motion of water in bmim-AOT RMs is less restricted than that of the water molecules confined in Na-AOT RMs. In summary, the results show how the nature of the bmim+ cation affects the interaction between the entrapped water and the RM interface, greatly modifying the interfacial water structure in comparison with the results known for Na-AOT.
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Affiliation(s)
- Cristian M O Lépori
- Departamento de Química, Universidad Nacional de Río Cuarto, Agencia Postal # 3, C.P. X5804BYA Río Cuarto, Argentina.
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9
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Vidal M, Pastenes C, Rezende MC, Aliaga C, Domínguez M. The inverted solvatochromism of protonated ferrocenylethenyl-pyrimidines: the first example of the solvatochromic reversal of a hybrid organic/inorganic dye. Org Chem Front 2019. [DOI: 10.1039/c9qo01043b] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/29/2022]
Abstract
Five new solvatochromic 2,6-diaryl-4-ferrocenylethenylpyrimidines were synthesized and their spectral variations in solution investigated in twenty-seven solvents of variable polarity.
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Affiliation(s)
- Matías Vidal
- Facultad de Química y Biología
- Universidad de Santiago de Chile
- Santiago
- Chile
| | - Camila Pastenes
- Facultad de Química y Biología
- Universidad de Santiago de Chile
- Santiago
- Chile
- Centro para el Desarrollo de la Nanociencia y la Nanotecnología
| | | | - Carolina Aliaga
- Facultad de Química y Biología
- Universidad de Santiago de Chile
- Santiago
- Chile
- Centro para el Desarrollo de la Nanociencia y la Nanotecnología
| | - Moisés Domínguez
- Facultad de Química y Biología
- Universidad de Santiago de Chile
- Santiago
- Chile
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10
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Girardi VR, Silber JJ, Falcone RD, Correa NM. Micropolarity and Hydrogen-Bond Donor Ability of Environmentally Friendly Anionic Reverse Micelles Explored by UV/Vis Absorption of a Molecular Probe and FTIR Spectroscopy. Chemphyschem 2018; 19:759-765. [PMID: 29418056 DOI: 10.1002/cphc.201701264] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/23/2017] [Revised: 12/27/2017] [Indexed: 11/07/2022]
Abstract
In the present work we show how two biocompatible solvents, methyl laurate (ML) and isopropyl myristate (IPM), can be used as a less toxic alternative to replace the nonpolar component in a sodium 1,4-bis-2-ethylhexylsulfosuccinate (AOT) reverse micelles (RMs) formulation. In this sense, the micropolarity and the hydrogen-bond ability of the interface were monitored through the use of the solvatochromism of a molecular probe (1-methyl-8-oxyquinolinium betaine, QB) and Fourier transform infrared spectroscopy (FTIR). Our results demonstrate that the micropolarity sensed by QB in ML RMs is lower than in IPM RMs. Additionally, the water molecules form stronger H-bond interactions with the polar head of AOT in ML than in IPM. By FTIR was revealed that more water molecules interact with the interface in ML/AOT RMs. On the other hand, for AOT RMs generated in IPM, the weaker water-surfactant interaction allows the water molecules to establish hydrogen bonds with each other trending to bulk water more easily than in ML RMs, a consequence of the dissimilar penetration of nonpolar solvents into the interfacial region. The penetration process is strongly controlled by the polarity and viscosity of the external solvents. All of these results allow us to characterize these biocompatible systems, providing information about interfacial properties and how they can be altered by changing the external solvent. The ability of the nontoxic solvent to penetrate or not into the AOT interface produces a new interface with attractive properties.
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Affiliation(s)
- Valeria R Girardi
- Departamento de Química, Universidad Nacional de Río Cuarto, Agencia Postal # 3, C.P., X5804BYA, Río Cuarto, Argentina
| | - Juana J Silber
- Departamento de Química, Universidad Nacional de Río Cuarto, Agencia Postal # 3, C.P., X5804BYA, Río Cuarto, Argentina
| | - Ruben Darío Falcone
- Departamento de Química, Universidad Nacional de Río Cuarto, Agencia Postal # 3, C.P., X5804BYA, Río Cuarto, Argentina
| | - N Mariano Correa
- Departamento de Química, Universidad Nacional de Río Cuarto, Agencia Postal # 3, C.P., X5804BYA, Río Cuarto, Argentina
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11
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Crans DC, Peters BJ, Wu X, McLauchlan CC. Does anion-cation organization in Na+-containing X-ray crystal structures relate to solution interactions in inhomogeneous nanoscale environments: Sodium-decavanadate in solid state materials, minerals, and microemulsions. Coord Chem Rev 2017. [DOI: 10.1016/j.ccr.2017.03.016] [Citation(s) in RCA: 19] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/19/2022]
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12
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Monti GA, Fernández GA, Correa NM, Falcone RD, Moyano F, Silbestri GF. Gold nanoparticles stabilized with sulphonated imidazolium salts in water and reverse micelles. ROYAL SOCIETY OPEN SCIENCE 2017; 4:170481. [PMID: 28791171 PMCID: PMC5541566 DOI: 10.1098/rsos.170481] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/10/2017] [Accepted: 06/20/2017] [Indexed: 05/20/2023]
Abstract
Herein we describe the synthesis of gold nanoparticles (Au-NPs) in presence of sulphonated imidazolium salts [1,3-bis(2,6-diisopropyl-4-sodiumsulfonatophenyl)imidazolium (L1), 1-mesityl-3-(3-sulfonatopropyl)imidazolium (L2) and 1-(3-sulfonatopropyl)imidazolium (L3)] in water and in a confinement environment created by reverse micelles (RMs). The Au-NPs were characterized-with an excellent agreement between different techniques-by UV-vis spectroscopy, transmission electron microscopy (TEM), dynamic light scattering (DLS) and zeta potential. In homogeneous media, the Au-NPs interact with the imidazolium ring and the sulphonate groups were directed away from the NPs' surface. This fact is responsible for the Au-NPs' stability-over three months-in water. Based on the obtained zeta potential values we assume the degree of coverage of the Au-NPs by the imidazolium salts. In n-heptane/sodium 1,4-bis (2-ethylhexyl) sulfosuccinate (AOT)/water RMs, the Au-NPs formed in presence of sulphonated imidazolium salts present different patterns depending on the ligand used as stabilizer. Interestingly, the Au-NPs are more stable in time when the salts are present in AOT RMs (three weeks) in comparison with the same RMs system but in absence of ligands (less than an hour). Clearly, the sulphonated imidazolium salts are very effective Au-NPs stabilizers in a different medium and this generates a plus to be able to use them for multiple purposes.
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Affiliation(s)
- Gustavo A. Monti
- Departamento de Química, Universidad Nacional de Río Cuarto, Agencia Postal no. 3, C.P. X5804BYA Río Cuarto, Argentina
| | - Gabriela A. Fernández
- INQUISUR, Departamento de Química, Universidad Nacional del Sur (UNS)-CONICET, Av. Alem 1253, B8000CPB, Bahía Blanca, Argentina
| | - N. Mariano Correa
- Departamento de Química, Universidad Nacional de Río Cuarto, Agencia Postal no. 3, C.P. X5804BYA Río Cuarto, Argentina
| | - R. Darío Falcone
- Departamento de Química, Universidad Nacional de Río Cuarto, Agencia Postal no. 3, C.P. X5804BYA Río Cuarto, Argentina
| | - Fernando Moyano
- Departamento de Química, Universidad Nacional de Río Cuarto, Agencia Postal no. 3, C.P. X5804BYA Río Cuarto, Argentina
- Authors for correspondence: Fernando Moyano e-mail:
| | - Gustavo F. Silbestri
- INQUISUR, Departamento de Química, Universidad Nacional del Sur (UNS)-CONICET, Av. Alem 1253, B8000CPB, Bahía Blanca, Argentina
- Authors for correspondence: Gustavo F. Silbestri e-mail:
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13
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Lépori CMO, Silber JJ, Falcone RD, Correa NM. Improvement of the amphiphilic properties of a dialkyl phosphate by creation of a protic ionic liquid-like surfactant. RSC Adv 2017. [DOI: 10.1039/c7ra08907d] [Citation(s) in RCA: 15] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
Imim-DEHP, an interesting protic IL-like surfactant to create RMs in aliphatic and aromatic non-polar solvents and unilamellar vesicles in water.
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Affiliation(s)
- Cristian M. O. Lépori
- Departamento de Química
- Universidad Nacional de Río Cuarto
- C.P. X5804BYA Río Cuarto
- Argentina
| | - Juana J. Silber
- Departamento de Química
- Universidad Nacional de Río Cuarto
- C.P. X5804BYA Río Cuarto
- Argentina
| | - R. Darío Falcone
- Departamento de Química
- Universidad Nacional de Río Cuarto
- C.P. X5804BYA Río Cuarto
- Argentina
| | - N. Mariano Correa
- Departamento de Química
- Universidad Nacional de Río Cuarto
- C.P. X5804BYA Río Cuarto
- Argentina
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14
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Reissig HU, Domínguez M. N-Methylpyridinium-4-phenolates: Generation of a Betaine Dye Library Bearing Different Spacer Units and Their Solvatochromism. ChemistrySelect 2016. [DOI: 10.1002/slct.201601148] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Affiliation(s)
- Hans-Ulrich Reissig
- Institut für Chemie und Biochemie; Freie Universität Berlin; Takustrasse 3 14195 Berlin Germany
| | - Moisés Domínguez
- Institut für Chemie und Biochemie; Freie Universität Berlin; Takustrasse 3 14195 Berlin Germany
- Facultad de Química y Biología; Universidad de Santiago de Chile; Avenida Libertador Bernardo O'Higgins 3363 Santiago Chile
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15
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Peters BJ, Groninger AS, Fontes FL, Crick DC, Crans DC. Differences in Interactions of Benzoic Acid and Benzoate with Interfaces. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2016; 32:9451-9. [PMID: 27482911 PMCID: PMC6168200 DOI: 10.1021/acs.langmuir.6b02073] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/09/2023]
Abstract
The interaction of benzoic acid and benzoate with model membrane systems was characterized to understand the molecular interactions of the two forms of a simple aromatic acid with the components of the membrane. The microemulsion system based on bis(2-ethylhexyl)sulfosuccinate (AOT) allowed determination of the molecular positioning using 1D NMR and 2D NMR spectroscopic methods. Benzoic acid and benzoate were both found to penetrate the membrane/water interfaces; however, the benzoic acid was able to penetrate much deeper and thus is more readily able to traverse a membrane. The Langmuir monolayer model system, using dipalmitoylphosphatidylcholine, was used as a generic membrane lipid for a cell. Compression isotherms of monolayers demonstrated a pH dependent interaction with a lipid monolayer and confirming the pH dependent observations shown in the reverse micellar model system. These studies provide an explanation for the antimicrobial activity of benzoic acid while benzoate is inactive. Furthermore, these studies form the framework upon which we are investigating the mode of bacterial uptake of pyrazinoic acid, the active form of pyrazinamide, a front line drug used to combat tuberculosis.
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Affiliation(s)
- Benjamin J Peters
- Department of Chemistry, ‡Department of Biochemistry, §Cell and Molecular Biology Program, and ∥Mycobacteria Research Laboratories, Department of Microbiology, Immunology, and Pathology, Colorado State University , Fort Collins, Colorado 80523, United States
| | - Allison S Groninger
- Department of Chemistry, ‡Department of Biochemistry, §Cell and Molecular Biology Program, and ∥Mycobacteria Research Laboratories, Department of Microbiology, Immunology, and Pathology, Colorado State University , Fort Collins, Colorado 80523, United States
| | - Fabio L Fontes
- Department of Chemistry, ‡Department of Biochemistry, §Cell and Molecular Biology Program, and ∥Mycobacteria Research Laboratories, Department of Microbiology, Immunology, and Pathology, Colorado State University , Fort Collins, Colorado 80523, United States
| | - Dean C Crick
- Department of Chemistry, ‡Department of Biochemistry, §Cell and Molecular Biology Program, and ∥Mycobacteria Research Laboratories, Department of Microbiology, Immunology, and Pathology, Colorado State University , Fort Collins, Colorado 80523, United States
| | - Debbie C Crans
- Department of Chemistry, ‡Department of Biochemistry, §Cell and Molecular Biology Program, and ∥Mycobacteria Research Laboratories, Department of Microbiology, Immunology, and Pathology, Colorado State University , Fort Collins, Colorado 80523, United States
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16
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Domínguez M, Rezende MC. A Monte Carlo-quantum mechanics study of a solvatochromic π* probe. J Mol Model 2016; 22:218. [PMID: 27553303 DOI: 10.1007/s00894-016-3083-0] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/15/2016] [Accepted: 08/05/2016] [Indexed: 11/28/2022]
Abstract
The solvation and the solvatochromic behavior of 5-(dimethylamino)-5'-nitro-2,2'-bithiophene 1, the basis of a π* scale of solvent polarities, was investigated theoretically in toluene, dichloromethane, methanol and formamide with a Monte Carlo and quantum mechanics (QM/MM) iterative approach. The calculated transition energies of the solvatochromic band of 1, obtained as averages of statistically uncorrelated configurations, including the solute and explicit solvent molecules of the first solvation layer, besides showing good agreement with the experimental transitions, reproduced very well the positive solvatochromism of this probe in various solvents.
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Affiliation(s)
- Moisés Domínguez
- Facultad de Química y Biología, Universidad de Santiago de Chile, Av. Bernando O'Higgins 3363, Santiago, Chile.
- Facultad de Química y Biología, Universidad de Santiago, Casilla 40, Correo 33, Santiago, Chile.
| | - Marcos Caroli Rezende
- Facultad de Química y Biología, Universidad de Santiago de Chile, Av. Bernando O'Higgins 3363, Santiago, Chile
- Facultad de Química y Biología, Universidad de Santiago, Casilla 40, Correo 33, Santiago, Chile
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17
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Lépori CMO, Correa NM, Silber JJ, Falcone RD. How the cation 1-butyl-3-methylimidazolium impacts the interaction between the entrapped water and the reverse micelle interface created with an ionic liquid-like surfactant. SOFT MATTER 2016; 12:830-844. [PMID: 26542472 DOI: 10.1039/c5sm02421h] [Citation(s) in RCA: 27] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/05/2023]
Abstract
The behavior of the interfacial water entrapped in reverse micelles (RMs) formed by the ionic liquid-like surfactant 1-butyl-3-methylimidazolium 1,4-bis-2-ethylhexylsulfosuccinate (bmim-AOT) dissolved in benzene (or chlorobenzene) was investigated using noninvasive techniques such as dynamic light scattering (DLS), static light scattering (SLS), FT-IR and (1)H NMR. The DLS and SLS results reveal the formation of discrete spherical and non-interacting water droplets stabilized by the bmim-AOT surfactant. Moreover, since the droplet size increases as the W0 (W0 = [water]/[surfactant]) value increases, water interacts with the RM interface. From FT-IR and (1)H NMR data, a weaker water-surfactant interaction in bmim-AOT RMs in comparison with the RMs created by sodium 1,4-bis-2-ethylhexylsulfosuccinate (Na-AOT) is detected. Consequently, there are less water molecules interacting with the interface in bmim-AOT RMs, and their hydrogen bond network is not completely disrupted as they are in Na-AOT RMs. The results show how the nature of the new cation impacts the interaction between the entrapped water and the RM interface, modifying the interfacial water structure in comparison with the results known for Na-AOT.
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Affiliation(s)
- Cristian M O Lépori
- Departamento de Química, Universidad Nacional de Río Cuarto, Agencia Postal # 3, C.P. X5804BYA Río Cuarto, Argentina.
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18
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Cobo Solis AK, Mariano Correa N, Molina PG. Electrochemical and photophysical behavior of 1-naphthol in benzyl-n-hexadecyldimethylammonium 1,4-bis(2-ethylhexyl)sulfosuccinate large unilamellar vesicles. Phys Chem Chem Phys 2016; 18:15645-53. [DOI: 10.1039/c6cp01979j] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The behavior of 1-naphthol and its partition process in LUVs formed from a new catanionic surfactant were studied by electrochemical and spectroscopic techniques.
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Affiliation(s)
- Airam K. Cobo Solis
- Departamento de Química
- Facultad de Ciencias Exactas
- Físico-Químicas y Naturales
- Universidad Nacional de Río Cuarto
- Río Cuarto
| | - N. Mariano Correa
- Departamento de Química
- Facultad de Ciencias Exactas
- Físico-Químicas y Naturales
- Universidad Nacional de Río Cuarto
- Río Cuarto
| | - Patricia G. Molina
- Departamento de Química
- Facultad de Ciencias Exactas
- Físico-Químicas y Naturales
- Universidad Nacional de Río Cuarto
- Río Cuarto
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19
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Florez Tabares JS, Correa NM, Silber JJ, Sereno LE, Molina PG. Droplet-droplet interactions investigated using a combination of electrochemical and dynamic light scattering techniques. The case of water/BHDC/benzene:n-heptane system. SOFT MATTER 2015; 11:2952-2962. [PMID: 25727358 DOI: 10.1039/c5sm00146c] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/04/2023]
Abstract
In this contribution the electrochemistry of [Fe(CN)6](4-/3-) as the probe molecule was investigated in benzyl-n-hexadecyldimethylammonium chloride (BHDC) reverse micelles (RMs) varying the composition of the external solvent (benzene:n-heptane mixtures) and the surfactant concentration, at a fixed water content and probe concentration. The electrochemical and dynamic light scattering results show that in water/BHDC/benzene:n-heptane systems the aggregate sizes increase on increasing BHDC concentration. This behavior was unexpected since it is known that for water/BHDC/benzene RM systems keeping the water content constant and the surfactant concentration below 0.2 M, the droplet sizes are independent of the concentration of the surfactant. We explain the results considering that on changing the external solvent to benzene:n-heptane mixtures, RMs tend to associate in clusters and equilibrium between free RMs and droplet clusters is established. A model is presented which, using electrochemical and dynamic light scattering data, allows calculating the aggregation number of the RMs, the number of RMs that form the droplet clusters and the standard electron transfer heterogeneous rate constant.
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20
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Quintana SS, Dario Falcone R, Silber JJ, Moyano F, Mariano Correa N. On the characterization of NaDEHP/n-heptane nonaqueous reverse micelles: the effect of the polar solvent. Phys Chem Chem Phys 2015; 17:7002-11. [DOI: 10.1039/c4cp05024j] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Schematic representation of different interfaces in the novel nonaqueous NaDEHP/n-heptane reverse micelle.
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Affiliation(s)
- Silvina S. Quintana
- Departamento de Química
- Universidad Nacional de Río Cuarto
- Río Cuarto
- Argentina
| | - R. Dario Falcone
- Departamento de Química
- Universidad Nacional de Río Cuarto
- Río Cuarto
- Argentina
| | - Juana J. Silber
- Departamento de Química
- Universidad Nacional de Río Cuarto
- Río Cuarto
- Argentina
| | - Fernando Moyano
- Departamento de Química
- Universidad Nacional de Río Cuarto
- Río Cuarto
- Argentina
| | - N. Mariano Correa
- Departamento de Química
- Universidad Nacional de Río Cuarto
- Río Cuarto
- Argentina
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21
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Girardi VR, Silber JJ, Mariano Correa N, Darío Falcone R. The use of two non-toxic lipophilic oils to generate environmentally friendly anionic reverse micelles without cosurfactant. Comparison with the behavior found for traditional organic non-polar solvents. Colloids Surf A Physicochem Eng Asp 2014. [DOI: 10.1016/j.colsurfa.2014.05.077] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
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22
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Koninti RK, Gavvala K, Sengupta A, Hazra P. Excited State Proton Transfer Dynamics of Topotecan Inside Biomimicking Nanocavity. J Phys Chem B 2014; 119:2363-71. [DOI: 10.1021/jp5066902] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Raj Kumar Koninti
- Department
of Chemistry, Indian Institute of Science Education and Research (IISER), Pune 411008, Maharashtra, India
| | - Krishna Gavvala
- Department
of Chemistry, Indian Institute of Science Education and Research (IISER), Pune 411008, Maharashtra, India
| | - Abhigyan Sengupta
- Department
of Chemistry, Indian Institute of Science Education and Research (IISER), Pune 411008, Maharashtra, India
| | - Partha Hazra
- Department
of Chemistry, Indian Institute of Science Education and Research (IISER), Pune 411008, Maharashtra, India
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23
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Villa CC, Silber JJ, Correa NM, Falcone RD. Effect of the cationic surfactant moiety on the structure of water entrapped in two catanionic reverse micelles created from ionic liquid-like surfactants. Chemphyschem 2014; 15:3097-109. [PMID: 25044685 DOI: 10.1002/cphc.201402307] [Citation(s) in RCA: 24] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/08/2014] [Indexed: 11/08/2022]
Abstract
The behavior of water entrapped in reverse micelles (RMs) formed by two catanionic ionic liquid-like surfactants, benzyl-n-hexadecyldimethylammonium 1,4-bis-2-ethylhexylsulfosuccinate (AOT-BHD) and cetyltrimethylammonium 1,4-bis-2-ethylhexylsulfosuccinate (AOT-CTA), was investigated by using dynamic (DLS) and static (SLS) light scattering, FTIR, and (1)H NMR spectroscopy techniques. To the best of our knowledge, this is the first report in which AOT-CTA has been used to create RMs and encapsulate water. DLS and SLS results revealed the formation of RMs in benzene and the interaction of water with the RM interface. From FTIR and (1)H NMR spectroscopy data, a difference in the magnitude of the water-catanionic surfactant interaction at the interface is observed. For the AOT-BHD RMs, a strong water-surfactant interaction can be invoked whereas for AOT-CTA this interaction seems to be weaker. Consequently, more water molecules interact with the interface in AOT-BHD RMs with a completely disrupted hydrogen-bond network, than in AOT-CTA RMs in which the water structure is partially preserved. We suggest that the benzyl group present in the BHD(+) moiety in AOT-BHD is responsible for the behavior of the catanionic interface in comparison with the interface created in AOT-CTA. These results show that a simple change in the cationic component in the catanionic surfactant promotes remarkable changes in the RMs interface with interesting consequences, in particular when using the systems as nanoreactors.
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Affiliation(s)
- Cristian C Villa
- Departamento de Química, Universidad Nacional de Río Cuarto, Agencia Postal # 3. C.P. X5804BYA Río Cuarto (Argentina)
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24
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Thakur R, Das A, Chakraborty A. Interaction of human serum albumin with liposomes of saturated and unsaturated lipids with different phase transition temperatures: a spectroscopic investigation by membrane probe PRODAN. RSC Adv 2014. [DOI: 10.1039/c4ra01214c] [Citation(s) in RCA: 33] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
The interaction of human serum albumin (HSA) with liposomes made of saturated and unsaturated phosphocholines has been studied using circular dichroism (CD), steady state and time resolved fluorescence spectroscopic techniques.
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Affiliation(s)
- Raina Thakur
- Department of Chemistry
- Indian Institute of Technology Indore
- , India
| | - Anupam Das
- Department of Chemistry
- Indian Institute of Technology Indore
- , India
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Agazzi FM, Rodriguez J, Falcone RD, Silber JJ, Correa NM. PRODAN dual emission feature to monitor BHDC interfacial properties changes with the external organic solvent composition. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2013; 29:3556-3566. [PMID: 23441973 DOI: 10.1021/la304951f] [Citation(s) in RCA: 23] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/01/2023]
Abstract
We have investigated the water/benzyl-n-hexadecyldimethylammonium chloride (BHDC)/n-heptane:benzene reverse micelles (RMs) interfaces properties using 6-propionyl-2-(N,N-dimethyl)aminonaphthalene, PRODAN, as molecular probe. We have used absorption and emission (steady-state and time-resolved) spectroscopy of PRODAN to monitor the changes in the RMs interface functionalities upon changing the external organic solvent blend. We demonstrate that PRODAN is a useful probe to investigate how the external solvent composition affects the micelle interface properties. Our results show that changes in the organic solvent composition in water/BHDC/n-heptane:benzene RMs have a dramatic effect on the photophysics of PRODAN. Thus, increasing the aliphatic solvent content over the aromatic one produces PRODAN partition and PRODAN intramolecular electron transfer (ICT) processes. Additionally, the water presence in these RMs makes the PRODAN ICT process favored with the consequent decreases in the LE emission intensity and a better definition of the charge transfer (CT) band. All this evidence suggests that the benzene molecules are expelled out of the interface, and the water-BHDC interactions are stronger with more presence of water molecules in the polar part of the interface. Thus, we demonstrate that a simple change in the composition of the external phase promotes remarkable changes in the RMs interface. Finally, the results obtained with PRODAN together with those reported in a previous work in our lab reveal that the external phase is important when trying to control the properties of RMs interface. It should be noted that the external phase itself, besides the surfactant and the polar solvent sequestrated, is a very important control variable that can play a key role if we consider smart application of these RMs systems.
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Affiliation(s)
- Federico M Agazzi
- Departamento de Química, Universidad Nacional de Río Cuarto, Agencia Postal # 3, C.P X5804BYA Río Cuarto, Argentina
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26
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Guchhait B, Biswas R, Ghorai PK. Solute and Solvent Dynamics in Confined Equal-Sized Aqueous Environments of Charged and Neutral Reverse Micelles: A Combined Dynamic Fluorescence and All-Atom Molecular Dynamics Simulation Study. J Phys Chem B 2013; 117:3345-61. [DOI: 10.1021/jp310285k] [Citation(s) in RCA: 37] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Biswajit Guchhait
- Department
of Chemical, Biological and
Macromolecular Sciences, S. N. Bose National Centre for Basic Sciences, JD Block, Sector III, Salt
Lake, Kolkata 700098, India
| | - Ranjit Biswas
- Department
of Chemical, Biological and
Macromolecular Sciences, S. N. Bose National Centre for Basic Sciences, JD Block, Sector III, Salt
Lake, Kolkata 700098, India
| | - Pradip K. Ghorai
- Indian Institute of Science Education and Research, Kolkata, Mohanpur Campus, Nadia 741252,
India
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27
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Blach D, Silber JJ, Correa NM, Falcone RD. Electron donor ionic liquids entrapped in anionic and cationic reverse micelles. Effects of the interface on the ionic liquid–surfactant interactions. Phys Chem Chem Phys 2013; 15:16746-57. [DOI: 10.1039/c3cp52273c] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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28
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Villa CC, Moyano F, Ceolin M, Silber JJ, Falcone RD, Correa NM. A Unique Ionic Liquid with Amphiphilic Properties That Can Form Reverse Micelles and Spontaneous Unilamellar Vesicles. Chemistry 2012; 18:15598-601. [DOI: 10.1002/chem.201203246] [Citation(s) in RCA: 59] [Impact Index Per Article: 4.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/11/2012] [Indexed: 11/10/2022]
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29
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Domínguez ME, Rezende MC, Márquez S. Theoretical study of the solvatochromism of a donor-acceptor bithiophene. J Mol Model 2012; 19:689-96. [PMID: 23011609 DOI: 10.1007/s00894-012-1593-y] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/07/2012] [Accepted: 08/30/2012] [Indexed: 11/27/2022]
Abstract
The solvation and the solvatochromic behavior of the 5-(methylthio)-5'-nitro-2,2'-bithiophene 1 in diethyl ether, dichloromethane, acetonitrile, methanol and formamide was theoretically investigated with an iterative molecular and quantum mechanics (QM/MM) approach. Calculated longest-wavelength solvatochromic absorption band of 1, obtained as averages of statistically uncorrelated configurations, including the solute and explicit solvent molecules of the first and second solvation layer, were in excellent agreement with the experimental results.
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Affiliation(s)
- Moisés Elías Domínguez
- Institut für Chemie und Biochemie, Freie Universität Berlin, Takustrasse 3, 14195, Berlin, Germany.
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