1
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Moon HJ, Carrillo JMY, Song M, Rim G, Heller WT, Leisen J, Proaño L, Short GN, Banerjee S, Sumpter BG, Jones CW. Underlying Roles of Polyol Additives in Promoting CO 2 Capture in PEI/Silica Adsorbents. CHEMSUSCHEM 2024:e202400967. [PMID: 38830830 DOI: 10.1002/cssc.202400967] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/06/2024] [Accepted: 06/03/2024] [Indexed: 06/05/2024]
Abstract
Solid-supported amines having low molecular weight branched poly(ethylenimine) (PEI) physically impregnated into porous solid supports are promising adsorbents for CO2 capture. Co-impregnating short-chain poly(ethylene glycol) (PEG) together with PEI alters the performance of the adsorbent, delivering improved amine efficiency (AE, mol CO2 sorbed/mol N) and faster CO2 uptake rates. To uncover the physical basis for this improved gas capture performance, we probe the distribution and mobility of the polymers in the pores via small angle neutron scattering (SANS), solid-state NMR, and molecular dynamic (MD) simulation studies. SANS and MD simulations reveal that PEG displaces wall-bound PEI, making amines more accessible for CO2 sorption. Solid-state NMR and MD simulation suggest intercalation of PEG into PEI domains, separating PEI domains and reducing amine-amine interactions, providing potential PEG-rich and amine-poor interfacial domains that bind CO2 weakly via physisorption while providing facile pathways for CO2 diffusion. Contrary to a prior literature hypothesis, no evidence is obtained for PEG facilitating PEI mobility in solid supports. Instead, the data suggest that PEG chains coordinate to PEI, forming larger bodies with reduced mobility compared to PEI alone. We also demonstrate promising CO2 uptake and desorption kinetics at varied temperatures, facilitated by favorable amine distribution.
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Affiliation(s)
- Hyun June Moon
- School of Chemical & Biomolecular Engineering, Georgia Institute of Technology, Atlanta, GA 30332, USA
| | - Jan-Michael Y Carrillo
- Center for Nanophase Materials Sciences, Oak Ridge National Laboratory, Oak Ridge, TN 37380, USA
| | - MinGyu Song
- School of Chemical & Biomolecular Engineering, Georgia Institute of Technology, Atlanta, GA 30332, USA
| | - Guanhe Rim
- School of Chemical & Biomolecular Engineering, Georgia Institute of Technology, Atlanta, GA 30332, USA
| | - William T Heller
- Neutron Scattering Division, Oak Ridge National Laboratory, Oak Ridge, TN 37831, USA
| | - Johannes Leisen
- School of Chemistry and Biochemistry, Georgia Institute of Technology, Atlanta, GA 30332, USA
| | - Laura Proaño
- School of Chemical & Biomolecular Engineering, Georgia Institute of Technology, Atlanta, GA 30332, USA
| | - Gabriel N Short
- School of Chemical & Biomolecular Engineering, Georgia Institute of Technology, Atlanta, GA 30332, USA
| | - Sayan Banerjee
- School of Chemical & Biomolecular Engineering, Georgia Institute of Technology, Atlanta, GA 30332, USA
| | - Bobby G Sumpter
- Center for Nanophase Materials Sciences, Oak Ridge National Laboratory, Oak Ridge, TN 37380, USA
| | - Christopher W Jones
- School of Chemical & Biomolecular Engineering, Georgia Institute of Technology, Atlanta, GA 30332, USA
- School of Chemistry and Biochemistry, Georgia Institute of Technology, Atlanta, GA 30332, USA
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2
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Gerig JT. Examination of Solvent Interactions with Trp-Cage in 1,1,1,3,3,3-Hexafluoro-2-propanol-water at 298 K through MD Simulations and Intermolecular Nuclear Overhauser Effects. J Phys Chem B 2023; 127:5062-5071. [PMID: 37249321 PMCID: PMC10258800 DOI: 10.1021/acs.jpcb.3c01029] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/14/2023] [Revised: 05/08/2023] [Indexed: 05/31/2023]
Abstract
MD simulations of the peptide Trp-cage dissolved in 28% hexafluoroisopropanol (HFIP)-water have been carried out at 298 K with the goal of exploring peptide hydrogen-solvent fluorine nuclear spin cross-relaxation. The work was motivated by the observation that most experimental fluoroalcohol-peptide cross-relaxation terms at 298 K are small, both positive and negative, and not always well predicted from simulations. The cross-relaxation terms for hydrogens of the caged tryptophan residue of Trp-cage are substantially negative, a result consistent with simulations. It was concluded that hexafluoroisopropanol interactions near this part of the peptide are particularly long-lived. While both HFIP and water are present in all regions of the simulation box, the composition of the solvent mixture is not homogeneous throughout the system. HFIP generally accumulates near the peptide surface, while water molecules are preferentially found in regions that are more than 1.5 nm from the surface of the peptide. However, some water remains in higher-than-expected amounts in the solvent layer surrounding 6Trp, 9Asp, Ser13, and Ser14 residues in the helical region of Trp-cage. As observed in simulations of this system at 278 K, HFIP molecules aggregate into clusters that continually form and re-form. Translational diffusion of both HFIP and water appears to be slowed near the surface of the peptide with reduction in diffusion near the 6Trp residue 2- to 3-fold larger than calculated for solvent interactions with other regions of Trp-cage.
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Affiliation(s)
- J. T. Gerig
- Department of Chemistry &
Biochemistry, University of California,
Santa Barbara, Santa
Barbara, California 93106, United States
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3
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Tian FX, Qu J. Studies on the Origin of the Stabilizing Effects of Fluorinated Alcohols and Weakly Coordinated Fluorine-Containing Anions on Cationic Reaction Intermediates. J Org Chem 2022; 87:1814-1829. [PMID: 35020378 DOI: 10.1021/acs.joc.1c02361] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/19/2022]
Abstract
Many synthetic methods that use fluorinated alcohols as solvents have been reported, and the fluorinated alcohols have been found to be crucial to the success of these methods. In addition, there have been reports indicating that adding a weakly coordinated fluorine-containing anion, such as BF4-, PF6-, or SbF6-, to fluorinated alcohols can improve yields. The boosting effect of fluorinated alcohols is attributed mainly to hydrogen bond activation. A few studies have suggested that the very polar fluorinated alcohols can stabilize cationic reaction intermediates. However, how they do so and why weakly coordinated fluorine-containing anions improve yields have not been studied in depth. Here, we used quaternary ammonium cations, a quaternary phosphonium cation, and a triaryl-substituted carbocation as models for short-lived cationic intermediates and studied the possible interactions of these cations with fluorinated alcohols and BF4-, PF6-, or SbF6-. On the basis of the results, we propose that the C-F dipoles of fluorinated alcohols and the E-F dipoles (where E is B, P, or Sb) of weakly coordinated fluorine-containing anions stabilized these cations by intermolecular charge-dipole interactions. We deduced that in the same fashion the C-F and E-F dipoles can thermodynamically stabilize cationic reaction intermediates.
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Affiliation(s)
- Feng-Xian Tian
- The State Key Laboratory and Institute of Elemento-Organic Chemistry, College of Chemistry, Nankai University, Tianjin 300071, China
| | - Jin Qu
- The State Key Laboratory and Institute of Elemento-Organic Chemistry, College of Chemistry, Nankai University, Tianjin 300071, China
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4
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Muhammad A, Di Carmine G, Forster L, D'Agostino C. Solvent Effects in the Homogeneous Catalytic Reduction of Propionaldehyde with Aluminium Isopropoxide Catalyst: New Insights from PFG NMR and NMR Relaxation Studies. Chemphyschem 2020; 21:1101-1106. [PMID: 32271976 PMCID: PMC7317967 DOI: 10.1002/cphc.202000267] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/31/2020] [Revised: 04/09/2020] [Indexed: 11/08/2022]
Abstract
Solvent effects in homogeneous catalysis are known to affect catalytic activity. Whilst these effects are often described using qualitative features, such as Kamlet‐Taft parameters, experimental tools able to quantify and reveal in more depth such effects have remained unexplored. In this work, PFG NMR diffusion and T1 relaxation measurements have been carried out to probe solvent effects in the homogeneous catalytic reduction of propionaldehyde to 1‐propanol in the presence of aluminium isopropoxide catalyst. Using data on diffusion coefficients it was possible to estimate trends in aggregation of different solvents. The results show that solvents with a high hydrogen‐bond accepting ability, such as ethers, tend to form larger aggregates, which slow down the molecular dynamics of aldehyde molecules, as also suggested by T1 measurements, and preventing their access to the catalytic sites, which results in the observed decrease of catalytic activity. Conversely, weakly interacting solvents, such as alkanes, do not lead to the formation of such aggregates, hence allowing easy access of the aldehyde molecules to the catalytic sites, resulting in higher catalytic activity. The work reported here is a clear example on how combining traditional catalyst screening in homogeneous catalysis with NMR diffusion and relaxation time measurements can lead to new physico‐chemical insights into such systems by providing data able to quantify aggregation phenomena and molecular dynamics.
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Affiliation(s)
- Atika Muhammad
- Department of Chemical Engineering and Analytical Science, The University of Manchester, The Mill, Sackville Street, Manchester, M13 9PL, UK
| | - Graziano Di Carmine
- Department of Chemical Engineering and Analytical Science, The University of Manchester, The Mill, Sackville Street, Manchester, M13 9PL, UK
| | - Luke Forster
- Department of Chemical Engineering and Analytical Science, The University of Manchester, The Mill, Sackville Street, Manchester, M13 9PL, UK
| | - Carmine D'Agostino
- Department of Chemical Engineering and Analytical Science, The University of Manchester, The Mill, Sackville Street, Manchester, M13 9PL, UK
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5
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Coughlan NJA, Liu C, Lecours MJ, Campbell JL, Hopkins WS. Preferential Ion Microsolvation in Mixed-Modifier Environments Observed Using Differential Mobility Spectrometry. JOURNAL OF THE AMERICAN SOCIETY FOR MASS SPECTROMETRY 2019; 30:2222-2227. [PMID: 31529402 DOI: 10.1007/s13361-019-02332-1] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/12/2019] [Revised: 08/20/2019] [Accepted: 08/27/2019] [Indexed: 06/10/2023]
Abstract
The preferential solvation behavior for eight different derivatives of protonated quinoline was measured in a tandem differential mobility spectrometer mass spectrometer (DMS-MS). Ion-solvent cluster formation was induced in the DMS by the addition of chemical modifiers (i.e., solvent vapors) to the N2 buffer gas. To determine the effect of more than one modifier in the DMS environment, we performed DMS experiments with varying mixtures of water, acetonitrile, and isopropyl alcohol solvent vapors. The results show that doping the buffer gas with a binary mixture of modifiers leads to the ions binding preferentially to one modifier over another. We used density functional theory to calculate the ion-solvent binding energies, and in all cases, calculations show that the quinolinium ions bind most strongly with acetonitrile, then isopropyl alcohol, and most weakly with water. Computational results support the hypothesis that the quinolinium ions bind exclusively to whichever solvent they have the strongest interaction with, regardless of the presence of other modifier gases.
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Affiliation(s)
- Neville J A Coughlan
- Department of Chemistry, University of Waterloo, 200 University Ave. W., Waterloo, ON, N2L 3G1, Canada
| | - Chang Liu
- SCIEX, Four Valley Dr., Concord, ON, L4K 4V8, Canada
| | - Michael J Lecours
- Department of Chemistry, University of Waterloo, 200 University Ave. W., Waterloo, ON, N2L 3G1, Canada
| | - J Larry Campbell
- Department of Chemistry, University of Waterloo, 200 University Ave. W., Waterloo, ON, N2L 3G1, Canada.
- SCIEX, Four Valley Dr., Concord, ON, L4K 4V8, Canada.
| | - W Scott Hopkins
- Department of Chemistry, University of Waterloo, 200 University Ave. W., Waterloo, ON, N2L 3G1, Canada.
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6
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Gerig JT. Examination of Trifluoroethanol Interactions with Trp-Cage in Trifluoroethanol-Water at 298 K through Molecular Dynamics Simulations and Intermolecular Nuclear Overhauser Effects. J Phys Chem B 2019; 123:3248-3258. [PMID: 30916962 DOI: 10.1021/acs.jpcb.9b01171] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/19/2022]
Abstract
Molecular dynamics simulations of the protein model Trp-cage in 42% trifluoroethanol (TFE)-water at 298 K have been carried out with the goal of exploring peptide hydrogen-solvent fluorine nuclear spin cross-relaxation. The TFE5 model of TFE developed in a previous work was used with the TIP5P-Ew model of water. System densities and component translational diffusion coefficients predicted by the simulations were within 20% of the experimental values. Consideration of the calculated relative amounts of TFE and water surrounding the hydrogens of Trp-cage indicated that the composition of the solvent mixture beyond ∼1.5 nm from the van der Waals surface of the peptide is close to the composition of the bulk solvent, but as observed by others, TFE accumulates preferentially near the peptide surface. In the simulations, both TFE and water molecules make contacts with the peptide surface; water molecules predominate in contacts with the peptide backbone atoms and TFE molecules generally preferentially interact with side chains. Translational diffusion of solvent molecules appears to be slowed near the surface of the peptide. Depending on the location in the structure, TFE molecules form complexes with the peptide that may persist for up to ∼7 ns. Many of the peptide spin-solvent fluorine cross-relaxation parameters (ΣHF) for which experimental values are available are reasonably well-predicted from the simulations. However, the calculated ΣHF values were too small for some hydrogens of the 6Trp indole ring and the amino acid hydrogens near this residue in the native structure, whereas ΣHF values for hydrogens on the side chains of 1Asn, 4Ile, and 7Leu are too large. In 42% TFE-water, persistent conformations of Trp-cage are found, which differ from the conformation found in water by the orientation of the 3Tyr ring.
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Affiliation(s)
- J T Gerig
- Department of Chemistry & Biochemistry , University of California, Santa Barbara , Santa Barbara , California 93106 , United States
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7
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Gerig JT. Examination of Trifluoroethanol Interactions with Trp-Cage through MD Simulations and Intermolecular Nuclear Overhauser Effects. J Phys Chem B 2016; 120:11256-11265. [DOI: 10.1021/acs.jpcb.6b08430] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- J. T. Gerig
- Department of Chemistry and
Biochemistry, University of California at Santa Barbara, Santa Barbara, California 93106, United States
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8
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von Krbek LKS, Achazi AJ, Solleder M, Weber M, Paulus B, Schalley CA. Allosteric and Chelate Cooperativity in Divalent Crown Ether/Ammonium Complexes with Strong Binding Enhancement. Chemistry 2016; 22:15475-15484. [DOI: 10.1002/chem.201603098] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/29/2016] [Indexed: 11/10/2022]
Affiliation(s)
- Larissa K. S. von Krbek
- Institut für Chemie und Biochemie; Organische Chemie; Freie Universität Berlin; Takustr. 3 14195 Berlin Germany
| | - Andreas J. Achazi
- Institut für Chemie und Biochemie; Organische Chemie; Freie Universität Berlin; Takustr. 3 14195 Berlin Germany
| | - Marthe Solleder
- Zuse Institute Berlin (ZIB); Takustr. 7 14195 Berlin Germany
| | - Marcus Weber
- Zuse Institute Berlin (ZIB); Takustr. 7 14195 Berlin Germany
| | - Beate Paulus
- Institut für Chemie und Biochemie; Organische Chemie; Freie Universität Berlin; Takustr. 3 14195 Berlin Germany
| | - Christoph A. Schalley
- Institut für Chemie und Biochemie; Organische Chemie; Freie Universität Berlin; Takustr. 3 14195 Berlin Germany
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9
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Zhang N, Ruan X, Song Y, Liu Z, He G. Molecular dynamics simulation of the hydration structure and hydrogen bonding behavior of phenol in aqueous solution. J Mol Liq 2016. [DOI: 10.1016/j.molliq.2016.06.048] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
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10
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Orban DE, Moretti A, Uhrich KE. Spatial location of indomethacin associated with unimeric amphiphilic carrier macromolecules as determined by nuclear magnetic resonance spectroscopy. MAGNETIC RESONANCE IN CHEMISTRY : MRC 2016; 54:575-583. [PMID: 26864907 DOI: 10.1002/mrc.4401] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/28/2015] [Revised: 11/23/2015] [Accepted: 11/27/2015] [Indexed: 06/05/2023]
Abstract
A combination of nuclear magnetic resonance (NMR) techniques including, proton NMR, relaxation analysis, two-dimensional nuclear Overhauser effect spectroscopy, and diffusion-ordered spectroscopy, has been used to demonstrate the spatial location of indomethacin within a unimolecular micelle. Understanding the location of drugs within carrier molecules using such NMR techniques can facilitate rational carrier design. In addition, this information provides insight to encapsulation efficiency of different drugs to determine the most efficient system for a particular bioactive. This study demonstrates that drugs loaded by the unimolecular amphiphile under investigation are not necessarily encapsulated but reside or localize to the periphery or interfacial region of the carrier molecule. The results have further implications as to the features of the unimolecular carrier that contribute to drug loading. In addition, evidence of drug retention associated with the unimolecular surfactant is possible in organic media, as well as in an aqueous environment. Such findings have implications for rational carrier design to correlate the carrier features to the drug of interest and indicate the strong retention capabilities of the unimolecular micelle for delivery applications. Copyright © 2016 John Wiley & Sons, Ltd.
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Affiliation(s)
- David E Orban
- Department of Chemistry and Chemical Biology, Rutgers, The State University of New Jersey, Piscataway, NJ, 08854, USA
- Air Liquide - Advanced Materials, Branchburg, NJ, 08876, USA
| | - Alysha Moretti
- Department of Chemistry and Chemical Biology, Rutgers, The State University of New Jersey, Piscataway, NJ, 08854, USA
| | - Kathryn E Uhrich
- Department of Chemistry and Chemical Biology, Rutgers, The State University of New Jersey, Piscataway, NJ, 08854, USA
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11
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Stock RI, Schramm ADS, Rezende MC, Machado VG. Reverse solvatochromism in solvent binary mixtures: a case study using a 4-(nitrostyryl)phenolate as a probe. Phys Chem Chem Phys 2016; 18:20266-9. [DOI: 10.1039/c6cp03875a] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/29/2022]
Abstract
A 4-(nitrostyryl)phenolate was synthesized and its use in pure solvents revealed a reversion in solvatochromism.
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Affiliation(s)
- Rafaela I. Stock
- Departamento de Química
- Universidade Federal de Santa Catarina
- UFSC
- Florianópolis
- Brazil
| | - Adriana D. S. Schramm
- Departamento de Química
- Universidade Federal de Santa Catarina
- UFSC
- Florianópolis
- Brazil
| | | | - Vanderlei G. Machado
- Departamento de Química
- Universidade Federal de Santa Catarina
- UFSC
- Florianópolis
- Brazil
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12
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Stock RI, Nandi LG, Nicoleti CR, Schramm ADS, Meller SL, Heying RS, Coimbra DF, Andriani KF, Caramori GF, Bortoluzzi AJ, Machado VG. Synthesis and Solvatochromism of Substituted 4-(Nitrostyryl)phenolate Dyes. J Org Chem 2015. [DOI: 10.1021/acs.joc.5b00983] [Citation(s) in RCA: 32] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Rafaela I. Stock
- Departamento de Química, Universidade Federal de Santa Catarina, UFSC, CP 476, Florianópolis, SC, 88040-900, Brazil
| | - Leandro G. Nandi
- Departamento de Química, Universidade Federal de Santa Catarina, UFSC, CP 476, Florianópolis, SC, 88040-900, Brazil
| | - Celso R. Nicoleti
- Departamento de Química, Universidade Federal de Santa Catarina, UFSC, CP 476, Florianópolis, SC, 88040-900, Brazil
| | - Adriana D. S. Schramm
- Departamento de Química, Universidade Federal de Santa Catarina, UFSC, CP 476, Florianópolis, SC, 88040-900, Brazil
| | - Sheila L. Meller
- Departamento de Química, Universidade Federal de Santa Catarina, UFSC, CP 476, Florianópolis, SC, 88040-900, Brazil
| | - Renata S. Heying
- Departamento de Química, Universidade Federal de Santa Catarina, UFSC, CP 476, Florianópolis, SC, 88040-900, Brazil
| | - Daniel F. Coimbra
- Departamento de Química, Universidade Federal de Santa Catarina, UFSC, CP 476, Florianópolis, SC, 88040-900, Brazil
| | - Karla F. Andriani
- Departamento de Química, Universidade Federal de Santa Catarina, UFSC, CP 476, Florianópolis, SC, 88040-900, Brazil
| | - Giovanni F. Caramori
- Departamento de Química, Universidade Federal de Santa Catarina, UFSC, CP 476, Florianópolis, SC, 88040-900, Brazil
| | - Adailton J. Bortoluzzi
- Departamento de Química, Universidade Federal de Santa Catarina, UFSC, CP 476, Florianópolis, SC, 88040-900, Brazil
| | - Vanderlei G. Machado
- Departamento de Química, Universidade Federal de Santa Catarina, UFSC, CP 476, Florianópolis, SC, 88040-900, Brazil
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13
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de Melo CEA, Nandi LG, Domínguez M, Rezende MC, Machado VG. Solvatochromic behavior of dyes with dimethylamino electron-donor and nitro electron-acceptor groups in their molecular structure. J PHYS ORG CHEM 2014. [DOI: 10.1002/poc.3402] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Affiliation(s)
- Carlos E. A. de Melo
- Departamento de Química; Universidade Federal de Santa Catarina; UFSC Florianópolis SC Brazil
| | - Leandro G. Nandi
- Departamento de Química; Universidade Federal de Santa Catarina; UFSC Florianópolis SC Brazil
| | - Moisés Domínguez
- Facultad de Química y Biología; Universidad de Santiago; Av. B. O'Higgins Santiago Chile
| | - Marcos C. Rezende
- Facultad de Química y Biología; Universidad de Santiago; Av. B. O'Higgins Santiago Chile
| | - Vanderlei G. Machado
- Departamento de Química; Universidade Federal de Santa Catarina; UFSC Florianópolis SC Brazil
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14
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Affiliation(s)
- Vanderlei G. Machado
- Departamento
de Química, Universidade Federal de Santa Catarina, UFSC, Florianópolis, SC 88040-900, Brazil
| | - Rafaela I. Stock
- Departamento
de Química, Universidade Federal de Santa Catarina, UFSC, Florianópolis, SC 88040-900, Brazil
| | - Christian Reichardt
- Fachbereich
Chemie, Philipps-Universität, Hans-Meerwein-Strasse, 35032 Marburg, Germany
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15
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Tiwari K, Mishra M, Singh VP. 8(E)-4-[{2-(2,4-dinitrophenyl)hydrazono}benzene-1,3-diol] as a solvatochromic Schiff base and chromogenic signaling of water content by its deprotonated form in acetonitrile. RSC Adv 2014. [DOI: 10.1039/c4ra03249g] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
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16
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Nandi LG, Facin F, Marini VG, Zimmermann LM, Giusti LA, Silva RD, Caramori GF, Machado VG. Nitro-Substituted 4-[(Phenylmethylene)imino]phenolates: Solvatochromism and Their Use as Solvatochromic Switches and as Probes for the Investigation of Preferential Solvation in Solvent Mixtures. J Org Chem 2012; 77:10668-79. [DOI: 10.1021/jo301890r] [Citation(s) in RCA: 40] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/22/2022]
Affiliation(s)
- Leandro G. Nandi
- Departamento de Química, Universidade Federal de Santa Catarina, UFSC, CP 476, Florianópolis,
Santa Catarina 88040-900, Brazil
| | - Felipe Facin
- Departamento de Química, Universidade Federal de Santa Catarina, UFSC, CP 476, Florianópolis,
Santa Catarina 88040-900, Brazil
| | - Vanderléia G. Marini
- Departamento de Química, Universidade Federal de Santa Catarina, UFSC, CP 476, Florianópolis,
Santa Catarina 88040-900, Brazil
| | - Lizandra M. Zimmermann
- Departamento de Química, Universidade Federal de Santa Catarina, UFSC, CP 476, Florianópolis,
Santa Catarina 88040-900, Brazil
| | - Luciano A. Giusti
- Departamento de Química, Universidade Federal de Santa Catarina, UFSC, CP 476, Florianópolis,
Santa Catarina 88040-900, Brazil
| | - Robson da Silva
- Departamento de Química, Universidade Federal de Santa Catarina, UFSC, CP 476, Florianópolis,
Santa Catarina 88040-900, Brazil
| | - Giovanni F. Caramori
- Departamento de Química, Universidade Federal de Santa Catarina, UFSC, CP 476, Florianópolis,
Santa Catarina 88040-900, Brazil
| | - Vanderlei G. Machado
- Departamento de Química, Universidade Federal de Santa Catarina, UFSC, CP 476, Florianópolis,
Santa Catarina 88040-900, Brazil
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17
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Karunasekara T, Poole CF. Models for liquid–liquid partition in the system dimethyl sulfoxide–organic solvent and their use for estimating descriptors for organic compounds. J Chromatogr A 2011; 1218:4525-36. [DOI: 10.1016/j.chroma.2011.05.023] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/25/2011] [Revised: 04/23/2011] [Accepted: 05/09/2011] [Indexed: 11/24/2022]
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18
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Giusti LA, Marini VG, Machado VG. Solvatochromic behavior of 1-(p-dimethylaminophenyl)-2-nitroethylene in 24 binary solvent mixtures composed of amides and hydroxylic solvents. J Mol Liq 2009. [DOI: 10.1016/j.molliq.2009.09.002] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
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19
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Nunes N, Ventura C, Martins F. Modeling Preferential Solvation in Ternary Solvent Systems. J Phys Chem B 2009; 113:3071-9. [DOI: 10.1021/jp804157b] [Citation(s) in RCA: 14] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Nélson Nunes
- Departamento de Engenharia Química, Instituto Superior de Engenharia de Lisboa, R. Conselheiro Emídio Navarro 1, 1900-014 Lisboa, Portugal, Centro de Química e Bioquímica, Ed. C8, Campo Grande, 1749-016 Lisboa, Portugal, Instituto Superior de Educação e Ciências, Alameda das Linhas de Torres 179, 1750 Lisboa, Portugal, and Departamento de Química e Bioquímica, Faculdade de Ciências, Universidade de Lisboa, Ed. C8, Campo Grande, 1749-016 Lisboa, Portugal
| | - Cristina Ventura
- Departamento de Engenharia Química, Instituto Superior de Engenharia de Lisboa, R. Conselheiro Emídio Navarro 1, 1900-014 Lisboa, Portugal, Centro de Química e Bioquímica, Ed. C8, Campo Grande, 1749-016 Lisboa, Portugal, Instituto Superior de Educação e Ciências, Alameda das Linhas de Torres 179, 1750 Lisboa, Portugal, and Departamento de Química e Bioquímica, Faculdade de Ciências, Universidade de Lisboa, Ed. C8, Campo Grande, 1749-016 Lisboa, Portugal
| | - Filomena Martins
- Departamento de Engenharia Química, Instituto Superior de Engenharia de Lisboa, R. Conselheiro Emídio Navarro 1, 1900-014 Lisboa, Portugal, Centro de Química e Bioquímica, Ed. C8, Campo Grande, 1749-016 Lisboa, Portugal, Instituto Superior de Educação e Ciências, Alameda das Linhas de Torres 179, 1750 Lisboa, Portugal, and Departamento de Química e Bioquímica, Faculdade de Ciências, Universidade de Lisboa, Ed. C8, Campo Grande, 1749-016 Lisboa, Portugal
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Testoni FM, Ribeiro EA, Giusti LA, Machado VG. Merocyanine solvatochromic dyes in the study of synergistic effects in mixtures of chloroform with hydrogen-bond accepting solvents. SPECTROCHIMICA ACTA. PART A, MOLECULAR AND BIOMOLECULAR SPECTROSCOPY 2009; 71:1704-1711. [PMID: 18678525 DOI: 10.1016/j.saa.2008.06.023] [Citation(s) in RCA: 31] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/15/2007] [Revised: 05/25/2008] [Accepted: 06/24/2008] [Indexed: 05/26/2023]
Abstract
The molar transition energy (E(T)) polarity values for the solvatochromic probes 2,6-diphenyl-4-(2,4,6-triphenylpyridinium)phenolate (1), 4[(1-methyl-4-(1H)-pyridinylidene)-ethylidene]-2,5-cyclohexadien-1-one (2), and 4-[4-(dimethylamino)styryl]-1-methylpyridinium iodide (3) were collected in binary mixtures comprising chloroform and a hydrogen-bond accepting (HBA) solvent [dimethyl sulfoxide (DMSO), N,N-dimethylformamide (DMF), N,N-dimethylacetamide (DMA), acetone or acetonitrile], aiming to investigate the ability of the chlorinated component to act as hydrogen-bond donating (HBD) solvent. Plots of E(T) as a function of X(2), the mole fraction of chloroform, were obtained and the data were analysed to investigate the preferential solvation (PS) of each probe in terms of both solute-solvent and solvent-solvent interactions. For dyes 1 and 2 a strong synergistic behavior was observed for all mixtures studied, indicating that the dyes are preferentially solvated by complexes formed through hydrogen bonding between chloroform and the HBA component in the mixtures. A study of 1 in deuterated chloroform with an HBA component (DMF and DMA) demonstrated that while almost no differences occur with the DMF mixtures, the presence of deuterated chloroform in its mixtures with DMA increases the synergistic effect, suggesting that it interacts more strongly with DMA, making its mixtures more polar. These data were successfully fitted to a model based on solvent-exchange equilibria. The features of the mixtures with dye 3 revealed a very different profile in comparison with the other two dyes, which suggests that in mixtures containing chloroform, the microenvironment of the dye seems to be important in determining the contribution of the structure resonances responsible for the stability of the dye.
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Affiliation(s)
- Fabíola M Testoni
- Departamento de Química, Universidade Regional de Blumenau, FURB, CP 1507, 89010-971 Blumenau, SC, Brazil
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Vandenbussche S, Díaz D, Fernández-Alonso MC, Pan W, Vincent SP, Cuevas G, Cañada FJ, Jiménez-Barbero J, Bartik K. Aromatic-carbohydrate interactions: an NMR and computational study of model systems. Chemistry 2008; 14:7570-8. [PMID: 18481803 DOI: 10.1002/chem.200800247] [Citation(s) in RCA: 70] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/01/2023]
Abstract
The interactions of simple carbohydrates with aromatic moieties have been investigated experimentally by NMR spectroscopy. The analysis of the changes in the chemical shifts of the sugar proton signals induced upon addition of aromatic entities has been interpreted in terms of interaction geometries. Phenol and aromatic amino acids (phenylalanine, tyrosine, tryptophan) have been used. The observed sugar-aromatic interactions depend on the chemical nature of the sugar, and thus on the stereochemistries of the different carbon atoms, and also on the solvent. A preliminary study of the solvation state of a model monosaccharide (methyl beta-galactopyranoside) in aqueous solution, both alone and in the presence of benzene and phenol, has also been carried out by monitoring of intermolecular homonuclear solvent-sugar and aromatic-sugar NOEs. These experimental results have been compared with those obtained by density functional theory methods and molecular mechanics calculations.
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Affiliation(s)
- Sophie Vandenbussche
- Molecular & Biomolecular Engineering, Université Libre de Bruxelles, Brussels, Belgium
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Bevilaqua T, Gonçalves TF, Venturini CDG, Machado VG. Solute-solvent and solvent-solvent interactions in the preferential solvation of 4-[4-(dimethylamino)styryl]-1-methylpyridinium iodide in 24 binary solvent mixtures. SPECTROCHIMICA ACTA. PART A, MOLECULAR AND BIOMOLECULAR SPECTROSCOPY 2006; 65:535-42. [PMID: 16524763 DOI: 10.1016/j.saa.2005.12.005] [Citation(s) in RCA: 38] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/26/2005] [Revised: 12/02/2005] [Accepted: 12/04/2005] [Indexed: 05/07/2023]
Abstract
The molar transition energy (E(T)) polarity values for the dye 4-[4-(dimethylamino)styryl]-1-methylpyridinium iodide were collected in binary mixtures comprising a hydrogen-bond accepting (HBA) solvent (acetone, acetonitrile, dimethyl sulfoxide (DMSO), and N,N-dimethylformamide (DMF)) and a hydrogen-bond donating (HBD) solvent (water, methanol, ethanol, propan-2-ol, and butan-1-ol). Data referring to mixtures of water with alcohols were also analyzed. These data were used in the study of the preferential solvation of the probe, in terms of both solute-solvent and solvent-solvent interactions. These latter interactions are of importance in explaining the synergistic behavior observed for many mixed solvent systems. All data were successfully fitted to a model based on solvent-exchange equilibria. The E(T) values of the dye dissolved in the solvents show that the position of the solvatochromic absorption band of the dye is dependent on the medium polarity. The solvation of the dye in HBA solvents occurs with a very important contribution from ion-dipole interactions. In HBD solvents, the hydrogen bonding between the dimethylamino group in the dye and the OH group in the solvent plays an important role in the solvation of the dye. The interaction of the hydroxylic solvent with the other component in the mixture can lead to the formation of hydrogen-bonded complexes, which solvate the dye using a lower polar moiety, i.e. alkyl groups in the solvents. The dye has a hydrophobic nature and a dimethylamino group with a minor capability for hydrogen bonding with the medium in comparison with the phenolate group present in Reichardt's pyridiniophenolate. Thus, the probe is able to detect solvent-solvent interactions, which are implicit to the observed synergistic behavior.
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Affiliation(s)
- Tharly Bevilaqua
- Centro Tecnológico, Universidade do Sul de Santa Catarina, CP 370, Tubarão, SC 88704-900, Brazil
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Dahlberg M, Laaksonen A. Preferential Solvation of Phenol in Binary Solvent Mixtures. A Molecular Dynamics Study. J Phys Chem A 2006; 110:2253-8. [PMID: 16466263 DOI: 10.1021/jp056463e] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
Molecular dynamics computer simulations were carried out to study the preferential solvation of phenol in equimolar acetonitrile-water and ethanol-water binary mixtures. Two water models were used to investigate the model dependence of preferential solvation. The results are compared to recent intermolecular 1H NOESY experiments reported on the same systems. In the case of acetonitrile-water the local mole fraction obtained from simulations agrees quite well with experiments. In the case of ethanol-water there was a qualitative difference, which was observed for both water models. However, when comparing the degree of preferential solvation of the two cosolvents ethanol and acetonitrile with each of the two water models, the trend obtained from the simulations agrees with experimental data.
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Affiliation(s)
- Martin Dahlberg
- Division of Physical Chemistry, Arrhenius Laboratory, Stockholm University, SE-106 91, Stockholm, Sweden
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Bentley TW, Ebdon DN, Kim EJ, Koo IS. Solvent Polarity and Organic Reactivity in Mixed Solvents: Evidence Using a Reactive Molecular Probe To Assess the Role of Preferential Solvation in Aqueous Alcohols. J Org Chem 2005; 70:1647-53. [PMID: 15730284 DOI: 10.1021/jo048163j] [Citation(s) in RCA: 27] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
Product selectivities [S = ([ester product]/[acid product]) x ([water]/[alcohol solvent])] are reported for solvolyses of p-methoxybenzoyl chloride (2) in aqueous methanol, ethanol, 2,2,2-trifluoroethanol, n-propyl alcohol, isopropyl alcohol, and tert-butyl alcohol at 25, 35, and 45 degrees C. S values are small and depend significantly on the alcohol cosolvent, varying from 1.3 in methanol to 0.1 in tert-butyl alcohol, but S depends only slightly on the solvent composition, and on the temperature. As S adjusts the product ratios for changes in bulk solvent compositions, it is suggested that preferential solvation by either alcohol or water at the reaction site is not a major factor influencing rates or products. Logarithms of rates of solvolyses of 2 correlate well with Kosower Z values (based on solvatochromism). In contrast, another solvatochromic polarity index, E(T)(30), shows "dispersion" in correlations with the solvent ionizing power parameter, Y(OTs), probably due to aromatic ring and other solvation effects.
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Affiliation(s)
- T William Bentley
- Department of Chemistry, University of Wales, Swansea, Singleton Park, Swansea, SA2 8PP, Wales, United Kingdom.
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Larsson EA, Staaf M, Söderman P, Höög C, Widmalm G. Determination of the Conformational Flexibility of Methyl α-Cellobioside in Solution by NMR Spectroscopy and Molecular Simulations. J Phys Chem A 2004. [DOI: 10.1021/jp049714c] [Citation(s) in RCA: 31] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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Bevilaqua T, da Silva DC, Machado VG. Preferential solvation of Brooker's merocyanine in binary solvent mixtures composed of formamides and hydroxylic solvents. SPECTROCHIMICA ACTA. PART A, MOLECULAR AND BIOMOLECULAR SPECTROSCOPY 2004; 60:951-958. [PMID: 15036108 DOI: 10.1016/s1386-1425(03)00324-x] [Citation(s) in RCA: 29] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/04/2003] [Accepted: 06/16/2003] [Indexed: 05/24/2023]
Abstract
The ET polarity values of 4-[(1-methyl-4(1H)-pyridinylidene)-ethylidene]-2,5-cyclohexadien-1-one (Brooker's merocyanine) were collected in mixed-solvent systems comprising a formamide [N,N-dimethylformamide (DMF), N-methylformamide (NMF) or formamide (FA)] and a hydroxylic (water, methanol, ethanol, propan-2-ol or butan-1-ol) solvent. Binary mixtures involving DMF and the other formamides (NMF and FA) as well as NMF and FA were also studied. These data were employed in the investigation of the preferential solvation (PS) of the probe. Each solvent system was analyzed in terms of both solute-solvent and solvent-solvent interactions. These latter interactions were responsible for the synergism observed in many binary mixtures. This synergistic behaviour was observed for DMF-propan-2-ol, DMF-butan-1-ol, FA-methanol, FA-ethanol and for the mixtures of the alcohols with NMF. All data were successfully fitted to a model based on solvent-exchange equilibria, which allowed the separation of the different contributions of the solvent species in the solvation shell of the dye. The results suggest that both hydrogen bonding and solvophobic interactions contribute to the formation of the solvent complexes responsible for the observed synergistic effects in the PS of the dye.
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Affiliation(s)
- Tharly Bevilaqua
- Centro Tecnológico, GRUCENSO, Pró-Reitoria Acadêmica, Universidade do Sul de Santa Catarina, CP 370, 88704-900 Tubarão, SC, Brazil
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Bentley TW, Koo IS. Role of hydroxyl concentrations in solvatochromic measures of solvent polarity of alcohols and alcohol–water mixtures—evidence that preferential solvation effects may be overestimated. Org Biomol Chem 2004; 2:2376-80. [PMID: 15305222 DOI: 10.1039/b408052c] [Citation(s) in RCA: 18] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
For single solvents, primary alcohols and water, there is a good linear correlation (r = 0.994) between the solvent polarity index ET(30) and the molar concentration of OH groups (or 1000/Vm, where Vm is the solvent molar volume). The corresponding correlations for alcohol-water mixtures are plots vs. the sum of molar concentrations of alcohol and water, alternatively expressed as plots of ET(30)vs. volume fraction. Our quantitative treatment is an extension of recent theoretical and experimental results. In contrast, previous studies of alcohol-water mixtures have relied on plots of ET(30)vs. mole fraction, and have overestimated the effect of preferential solvation of solvatochromic dyes by the more hydrophobic alcohols.
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Affiliation(s)
- T William Bentley
- Department of Chemistry, University of Wales, Swansea, Singleton Park, Swansea, Wales, UK SA2 8PP.
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