'Covalent' effects in 'ionic' liquids
Many binary systems (and their mixtures) which might be expected to be 'ionic', from electronegativity considerations, are found to exhibit pronounced 'covalent effects' in their condensed-phase structure and dynamical properties. Recent work, involving both electronic structure...
| Main Authors: | , |
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| Format: | Journal article |
| Language: | English |
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2000
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| _version_ | 1826264672530071552 |
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| author | Madden, P Wilson, M |
| author_facet | Madden, P Wilson, M |
| author_sort | Madden, P |
| collection | OXFORD |
| description | Many binary systems (and their mixtures) which might be expected to be 'ionic', from electronegativity considerations, are found to exhibit pronounced 'covalent effects' in their condensed-phase structure and dynamical properties. Recent work, involving both electronic structure calculations and computer simulation, has suggested that the interactions arise and are describable within the ionic model-provided that many-body effects, whose origin is the change in an ion's properties caused by interaction with its environment, are included. In systems where they are substantial, the many-body effects promote remarkably rich changes in the intermediaterange structure of an ionic liquid. A1Cl3 becomes molecular, BeCh a 'living polymer' of extended chains, and the distinctive intermediate-range order (IRO) of the three-dimensional-network, glassforming systems ZnCl2, BeF2 and SiO2 is reproduced. The structural changes have considerable dynamical consequences: for ZnCl2 the slow structural relaxation, leading to the glass transition, may be traced back to the relaxation of the IRO. On shorter timescales (higher frequency) these liquids exhibit spectroscopic bands usually assigned to quasi-molecular units. The formation and dissociation of these units is crucial in ionic conduction, and other transport properties. © 2000 IOP Publishing Ltd. |
| first_indexed | 2024-03-06T20:11:36Z |
| format | Journal article |
| id | oxford-uuid:2ac2f9f3-eff6-4a58-baa2-f81cee290e8f |
| institution | University of Oxford |
| language | English |
| last_indexed | 2024-03-06T20:11:36Z |
| publishDate | 2000 |
| record_format | dspace |
| spelling | oxford-uuid:2ac2f9f3-eff6-4a58-baa2-f81cee290e8f2022-03-26T12:26:52Z'Covalent' effects in 'ionic' liquidsJournal articlehttp://purl.org/coar/resource_type/c_dcae04bcuuid:2ac2f9f3-eff6-4a58-baa2-f81cee290e8fEnglishSymplectic Elements at Oxford2000Madden, PWilson, MMany binary systems (and their mixtures) which might be expected to be 'ionic', from electronegativity considerations, are found to exhibit pronounced 'covalent effects' in their condensed-phase structure and dynamical properties. Recent work, involving both electronic structure calculations and computer simulation, has suggested that the interactions arise and are describable within the ionic model-provided that many-body effects, whose origin is the change in an ion's properties caused by interaction with its environment, are included. In systems where they are substantial, the many-body effects promote remarkably rich changes in the intermediaterange structure of an ionic liquid. A1Cl3 becomes molecular, BeCh a 'living polymer' of extended chains, and the distinctive intermediate-range order (IRO) of the three-dimensional-network, glassforming systems ZnCl2, BeF2 and SiO2 is reproduced. The structural changes have considerable dynamical consequences: for ZnCl2 the slow structural relaxation, leading to the glass transition, may be traced back to the relaxation of the IRO. On shorter timescales (higher frequency) these liquids exhibit spectroscopic bands usually assigned to quasi-molecular units. The formation and dissociation of these units is crucial in ionic conduction, and other transport properties. © 2000 IOP Publishing Ltd. |
| spellingShingle | Madden, P Wilson, M 'Covalent' effects in 'ionic' liquids |
| title | 'Covalent' effects in 'ionic' liquids |
| title_full | 'Covalent' effects in 'ionic' liquids |
| title_fullStr | 'Covalent' effects in 'ionic' liquids |
| title_full_unstemmed | 'Covalent' effects in 'ionic' liquids |
| title_short | 'Covalent' effects in 'ionic' liquids |
| title_sort | covalent effects in ionic liquids |
| work_keys_str_mv | AT maddenp covalenteffectsinionicliquids AT wilsonm covalenteffectsinionicliquids |