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Fortes AD, Ponsonby J, Kirichek O, García-Sakai V. On the crystal structures and phase transitions of hydrates in the binary dimethyl sulfoxide–water system. ACTA CRYSTALLOGRAPHICA SECTION B-STRUCTURAL SCIENCE CRYSTAL ENGINEERING AND MATERIALS 2020; 76:733-748. [DOI: 10.1107/s2052520620008999] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/01/2020] [Accepted: 07/01/2020] [Indexed: 11/10/2022]
Abstract
Neutron powder diffraction data have been collected from a series of flash-frozen aqueous solutions of dimethyl sulfoxide (DMSO) with concentrations between 25 and 66.7 mol% DMSO. These reveal the existence of three stoichiometric hydrates, which crystallize on warming between 175 and 195 K. DMSO trihydrate crystallizes in the monoclinic space group P21/c, with unit-cell parameters at 195 K of a = 10.26619 (3), b = 7.01113 (2), c = 10.06897 (3) Å, β = 101.5030 (2)° and V = 710.183 (3) Å3 (Z = 4). Two of the symmetry-inequivalent water molecules form a sheet of tiled four- and eight-sided rings; the DMSO molecules are sandwiched between these sheets and linked along the b axis by the third water molecule to generate water–DMSO–water tapes. Two different polymorphs of DMSO dihydrate have been identified. The α phase is monoclinic (space group P21/c), with unit-cell parameters at 175 K of a = 6.30304 (4), b = 9.05700 (5), c = 11.22013 (7) Å, β = 105.9691 (4)° and V = 615.802 (4) Å3 (Z = 4). Its structure contains water–DMSO–water chains, but these are polymerized in such a manner as to form sheets of reniform eight-sided rings, with the methyl groups extending on either side of the sheet. On warming above 198 K, α-DMSO·2H2O undergoes a solid-state transformation to a mixture of DMSO·3H2O + anhydrous DMSO, and there is then a stable eutectic between these two phases at ∼203 K. The β-phase of DMSO dihydrate has been observed in a rapidly frozen eutectic melt and in very DMSO-rich mixtures. It is observed to be unstable with respect to the α-phase; above ∼180 K, β-DMSO·2H2O converts irreversibly to α-DMSO·2H2O. At 175 K, the lattice parameters of β-DMSO·2H2O are a = 6.17448 (10), b = 11.61635 (16), c = 8.66530 (12) Å, β = 101.663 (1)° and V = 608.684 (10) Å3 (Z = 4), hence this polymorph is just 1.16% denser than the α-phase under identical conditions. Like the other two hydrates, the space group appears likely, on the basis of systematic absences, to be P21/c, but the structure has not yet been determined. Our results reconcile 60 years of contradictory interpretations of the phase relations in the binary DMSO–water system, particularly between mole fractions of 0.25–0.50, and confirm empirical and theoretical studies of the liquid structure around the eutectic composition (33.33 mol% DMSO).
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Hydrological insights from hydrogen and oxygen isotopes in Source Area of the Yellow River, east-northern part of Qinghai–Tibet Plateau. J Radioanal Nucl Chem 2018. [DOI: 10.1007/s10967-018-5864-7] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
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Ferreira ESC, Voroshylova IV, Koverga VA, Pereira CM, Cordeiro MNDS. New Force Field Model for Propylene Glycol: Insight to Local Structure and Dynamics. J Phys Chem B 2017; 121:10906-10921. [PMID: 29112448 DOI: 10.1021/acs.jpcb.7b08251] [Citation(s) in RCA: 21] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
In this work we developed a new force field model (FFM) for propylene glycol (PG) based on the OPLS all-atom potential. The OPLS potential was refined using quantum chemical calculations, taking into account the densities and self-diffusion coefficients. The validation of this new FFM was carried out based on a wide range of physicochemical properties, such as density, enthalpy of vaporization, self-diffusion coefficients, isothermal compressibility, surface tension, and shear viscosity. The molecular dynamics (MD) simulations were performed over a large range of temperatures (293.15-373.15 K). The comparison with other force field models, such as OPLS, CHARMM27, and GAFF, revealed a large improvement of the results, allowing a better agreement with experimental data. Specific structural properties (radial distribution functions, hydrogen bonding and spatial distribution functions) were then analyzed in order to support the adequacy of the proposed FFM. Pure propylene glycol forms a continuous phase, displaying no microstructures. It is shown that the developed FFM gives rise to suitable results not only for pure propylene glycol but also for mixtures by testing its behavior for a 50 mol % aqueous propylene glycol solution. Furthermore, it is demonstrated that the addition of water to the PG phase produces a homogeneous solution and that the hydration interactions prevail over the propylene glycol self-association interactions.
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Affiliation(s)
- Elisabete S C Ferreira
- LAQV@REQUIMTE, Faculdade de Ciências, Departamento de Química e Bioquímica, Universidade do Porto , Rua do Campo Alegre, 4169-007 Porto, Portugal.,CIQ(UP), Faculdade de Ciências, Departamento de Química e Bioquímica, Universidade do Porto , Rua do Campo Alegre, 4169-007 Porto, Portugal
| | - Iuliia V Voroshylova
- LAQV@REQUIMTE, Faculdade de Ciências, Departamento de Química e Bioquímica, Universidade do Porto , Rua do Campo Alegre, 4169-007 Porto, Portugal.,CIQ(UP), Faculdade de Ciências, Departamento de Química e Bioquímica, Universidade do Porto , Rua do Campo Alegre, 4169-007 Porto, Portugal
| | - Volodymyr A Koverga
- Science and Technology, LASIR (UMR CNRS A8516), University of Lille , Bât. C5, Cité Scientifique, 59655 Villeneuve d'Ascq Cedex, France.,Department of Inorganic Chemistry, V. N. Karazin Kharkiv National University , Svoboda sq., 4, Kharkiv 61022, Ukraine
| | - Carlos M Pereira
- CIQ(UP), Faculdade de Ciências, Departamento de Química e Bioquímica, Universidade do Porto , Rua do Campo Alegre, 4169-007 Porto, Portugal
| | - M Natália D S Cordeiro
- LAQV@REQUIMTE, Faculdade de Ciências, Departamento de Química e Bioquímica, Universidade do Porto , Rua do Campo Alegre, 4169-007 Porto, Portugal
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Kirichek O. Sample environment for neutron scattering experiments at ISIS. JOURNAL OF NEUTRON RESEARCH 2017. [DOI: 10.3233/jnr-170036] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/07/2023]
Affiliation(s)
- Oleg Kirichek
- ISIS Neutron and Muon Source, Rutherford Appleton Laboratory, Science and Technology Facilities Council, Didcot, OX11 0QX, UK. E-mail:
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Rhys NH, Gillams RJ, Collins LE, Callear SK, Lawrence MJ, McLain SE. On the structure of an aqueous propylene glycol solution. J Chem Phys 2016; 145:224504. [DOI: 10.1063/1.4971208] [Citation(s) in RCA: 19] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/18/2022] Open
Affiliation(s)
- Natasha H. Rhys
- Department of Biochemistry, University of Oxford, Oxford OX1 3QU, United Kingdom
| | - Richard J. Gillams
- Department of Biochemistry, University of Oxford, Oxford OX1 3QU, United Kingdom
| | - Louise E. Collins
- King’s College London, Institute of Pharmaceutical Science, London SE1 9NH, United Kingdom
| | - Samantha K. Callear
- STFC, ISIS Facility, Rutherford Appleton Laboratory, Didcot OX11 0QU United Kingdom
| | - M. Jayne Lawrence
- King’s College London, Institute of Pharmaceutical Science, London SE1 9NH, United Kingdom
| | - Sylvia E. McLain
- Department of Biochemistry, University of Oxford, Oxford OX1 3QU, United Kingdom
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Kirichek O, Soper AK, Dzyuba B, Holt WV. Segregated water observed in a putative fish embryo cryopreservative. ROYAL SOCIETY OPEN SCIENCE 2016; 3:150655. [PMID: 27069654 PMCID: PMC4821265 DOI: 10.1098/rsos.150655] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 12/01/2015] [Accepted: 01/29/2016] [Indexed: 06/05/2023]
Abstract
Development of new cryopreservation strategies has major potential in medicine and agriculture and is critical to the conservation of endangered species that currently cannot be preserved. A critical property of any potential cryopreservative solution is its ability to prevent cell-damaging ice formation during cooling and subsequent heating. This study focuses on the freezing behaviour of promising model cryoprotective solutions. We perform neutron scattering analysis, combined with computer modelling, of the water structure after quench cooling these solutions. It is found that water in this solution forms nano-clusters encapsulated by the surrounding matrix of cryoprotectant solute molecules. We posit that these small volumes inhibit ice formation, because water does not have space for the structural relaxation required to crystallize on the timescale of the cooling process.
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Affiliation(s)
- O. Kirichek
- STFC Rutherford Appleton Laboratory, ISIS Facility, Harwell Oxford, Didcot, Oxon OX11 0QX, UK
| | - A. K. Soper
- STFC Rutherford Appleton Laboratory, ISIS Facility, Harwell Oxford, Didcot, Oxon OX11 0QX, UK
| | - B. Dzyuba
- Faculty of Fisheries and Protection of Waters, University of South Bohemia in Ceske Budejovice, South Bohemian Research Center of Aquaculture and Hydrocenoses, Zatisi 728/II, Vodnany 38925, Czech Republic
| | - W. V. Holt
- Academic Unit of Reproductive and Developmental Medicine, University of Sheffield, Tree Root Walk, Sheffield S10 2SF, UK
- Institute of Zoology, Zoological Society of London, Regent’s Park, London NW1 4RY, UK
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