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Benmore CJ, Wang Y, Darling SB, Chen J. Molecular interactions in short-chain perfluoroalkyl carboxylic acids and aqueous solutions. PHILOSOPHICAL TRANSACTIONS. SERIES A, MATHEMATICAL, PHYSICAL, AND ENGINEERING SCIENCES 2023; 381:20220333. [PMID: 37691465 PMCID: PMC10493550 DOI: 10.1098/rsta.2022.0333] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/12/2023] [Accepted: 03/14/2023] [Indexed: 09/12/2023]
Abstract
The presence of short-chain per- and polyfluoroalkyl substances in water poses a major health and environmental challenge. Here, we have performed high-energy small- and wide-angle X-ray scattering measurements on CF3[CF2]nCOOH (where n = 1, 2, 3 represents the chain length) and their aqueous solutions at 10% mole concentrations to characterize their molecular interactions at the atomic and nanometer length scales. The experimental wide-angle structure factors have been modelled using Empirical Potential Structural Refinement. The oxygen-oxygen partial X-ray pair distribution functions show that the coordination number between the hydroxyl oxygen on the acid and surrounding oxygen water molecules increases significantly with acid chain length, rising from 3.2 for n = 1 to 4.1 for n = 3. The small-angle scattering is dominated by a sharp, high-intensity peak at Q1 ∼ 0.2 Å-1 and a smaller peak at Q2 = 1.2 Å-1 for n = 3, both of which decrease with decreasing chain length. The Q2 peak is attributed to groups of adjacent non-bonded acid molecules, and Q1 has contributions from both correlations between acid molecules and water-water interactions. In all cases, the models show nanoscale aggregation occurs in the form of denser channels of winding hydrogen-bonded chains, approximately 20 water molecules in length, surrounding clusters of acid molecules. This article is part of the theme issue 'Exploring the length scales, timescales and chemistry of challenging materials (Part 2)'.
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Affiliation(s)
- Chris J. Benmore
- X-Ray Science Division, Advanced Photon Source, Argonne National Laboratory, Lemont,IL 60439, USA
- Consortium for Advanced Science and Engineering, University of Chicago, Chicago,IL 60637, USA
| | - Yuqin Wang
- Chemical Sciences and Engineering Division, Physical Sciences and Engineering Directorate, Argonne National Laboratory, Lemont,IL 60439, USA
- Pritzker School of Molecular Engineering, University of Chicago, Chicago,IL 60637, USA
| | - Seth B. Darling
- Chemical Sciences and Engineering Division, Physical Sciences and Engineering Directorate, Argonne National Laboratory, Lemont,IL 60439, USA
- Pritzker School of Molecular Engineering, University of Chicago, Chicago,IL 60637, USA
| | - Junhong Chen
- Chemical Sciences and Engineering Division, Physical Sciences and Engineering Directorate, Argonne National Laboratory, Lemont,IL 60439, USA
- Pritzker School of Molecular Engineering, University of Chicago, Chicago,IL 60637, USA
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Silva-Santisteban A, Steinke N, Johnston AJ, Ruiz GN, Carlos Pardo L, McLain SE. On the structure of prilocaine in aqueous and amphiphilic solutions. Phys Chem Chem Phys 2017; 19:12665-12673. [DOI: 10.1039/c7cp01723e] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/27/2022]
Abstract
The solvation of prilocaine has been investigated in pure water and in amphiphilic solutions using a combination of neutron diffraction and simulations.
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Affiliation(s)
- Alvaro Silva-Santisteban
- Department of Biochemistry
- University of Oxford
- Oxford OX1 3QU
- UK
- Departament de Física i Enginyeria Nuclear & Barcelona Research Center in Multiscale Science and Engineering
| | - Nicola Steinke
- Department of Biochemistry
- University of Oxford
- Oxford OX1 3QU
- UK
| | | | - Guadalupe N. Ruiz
- Departament de Física i Enginyeria Nuclear & Barcelona Research Center in Multiscale Science and Engineering
- Universitat Politècnica de Catalunya
- 08019 Barcelona
- Spain
| | - Luis Carlos Pardo
- Departament de Física i Enginyeria Nuclear & Barcelona Research Center in Multiscale Science and Engineering
- Universitat Politècnica de Catalunya
- 08019 Barcelona
- Spain
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Abstract
This paper summarizes the scientific trends associated with the rapid development of the technique of high-energy X-ray diffraction over the past decade pertaining to the field of liquids, glasses, and amorphous materials. The measurement of high-quality X-ray structure factors out to large momentum transfers leads to high-resolution pair distribution functions which can be directly compared to theory or combined with data from other experimental techniques. The advantages of combining highly penetrating radiation with low angle scattering are outlined together with the data analysis procedure and formalism. Also included are advances in high-energy synchrotron beamline instrumentation, sample environment equipment, and an overview of the role of simulation and modeling for interpreting data from disordered materials. Several examples of recent trends in glass and liquid research are described. Finally, directions for future research are considered within the context of past and current developments in the field.
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Affiliation(s)
- C. J. Benmore
- Department of Physics, Arizona State University, Tempe, AZ 85287-1604, USA
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Wurden C, Page K, Llobet A, White CE, Proffen T. Extracting differential pair distribution functions usingMIXSCAT. J Appl Crystallogr 2010. [DOI: 10.1107/s0021889810009155] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022] Open
Abstract
Differently weighted experimental scattering data have been used to extract partial or differential structure factors or pair distribution functions in studying many materials. However, this is not done routinely partly because of the lack of user-friendly software. This paper presentsMIXSCAT, a new member of theDISCUSprogram package.MIXSCATallows one to combine neutron and X-ray pair distribution functions and extract their respective differential functions.
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Lane JR, Kjaergaard HG. Fluorosulfonic Acid and Chlorosulfonic Acid: Possible Candidates for OH-Stretching Overtone-Induced Photodissociation. J Phys Chem A 2007; 111:9707-13. [PMID: 17764162 DOI: 10.1021/jp074436d] [Citation(s) in RCA: 14] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
We have calculated the stationary points and internal reaction coordinate pathway for the dissociation of fluorosulfonic acid (FSO3H) and chlorosulfonic acid (ClSO3H). These sulfonic acids dissociate to sulfur trioxide and hydrogen fluoride and chloride, respectively. We have calculated the frequencies and intensities of the OH-stretching transitions of FSO3H and ClSO3H with an anharmonic oscillator local mode model. We find that excitation of the fourth and third OH-stretching overtones provide adequate energy for photodissociation of FSO3H and ClSO3H, respectively. We propose that experimental detection of the products of OH-stretching overtone-induced photodissociation of FSO3H and ClSO3H would be easier than the sulfuric acid (H2SO4) equivalent. The photodissociation of H2SO4 is thought to be important in the stratosphere. The FSO3H and ClSO3H experiment could be used in proxy to support the recently proposed OH-stretching overtone-induced photodissociation mechanism of H2SO4.
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Affiliation(s)
- Joseph R Lane
- Department of Chemistry, University of Otago, P.O. Box 56, Dunedin 9054, New Zealand
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Stoyanov ES, Kim KC, Reed CA. An Infrared νNH Scale for Weakly Basic Anions. Implications for Single-Molecule Acidity and Superacidity. J Am Chem Soc 2006; 128:8500-8. [PMID: 16802816 DOI: 10.1021/ja060714v] [Citation(s) in RCA: 101] [Impact Index Per Article: 5.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/24/2023]
Abstract
The N-H stretching frequencies of tri-n-octylammonium salts are reported for a series of weakly basic anions (A(-)), many of which are the conjugate bases of known strong acids and superacids. Data have been collected primarily in carbon tetrachloride, where Oct(3)N(+)-H...A(-) contact ion pairs are formed. In the more polar solvent 1,2-dichloroethane, some salts form both contact and solvent-separated ion pairs. Salts have also been studied in crystalline form or as oils. In general, the nuNH frequencies decrease in the order fluoroanions > carboranes > oxyanions, reflecting the relative basicities of the anions. By inference, the data reflect differences in the acidity of the corresponding conjugate acids (HA). This qualitative indicator of acid strength is useful because it reflects acidity on an individual molecule basis rather than in bulk. In this respect, it provides a condensed-phase analogy to gas-phase ("intrinsic") acidity and gives insight into the aggregation phenomena that determine bulk acidity. The data also reveal the importance of the chemical stability of conjugate base anions in attaining high acidity and suggest where acids stronger than those presently known may be discovered.
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Affiliation(s)
- Evgenii S Stoyanov
- Department of Chemistry, University of California, Riverside, CA 92521, USA
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Beran M, P?�hoda J. A New Method of the Preparation of Imido-bis(sulfuric acid) Dihalogenide, (F, Cl), and the Potassium Salt of Imido-bis(sulfuric acid) Difluoride. Z Anorg Allg Chem 2005. [DOI: 10.1002/zaac.200400325] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
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