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|Title:||Spectrophotometric studies of aqueous systems.|
|Authors:||Wooten, M. J.|
|Presented at:||University of Leicester|
|Abstract:||Mixtures of non-electrolytes and water are frequently used as solvent media. Spectrophotometric examinations of such mixtures and water are reported. Particular emphasis is given to t-butyl alcohol + water mixtures. Spectroscopic evidence for structural models of liquid water is reviewed and these models are used in the ensuing discussion. The existence of thermal discontinuities in the properties of liquid water is discussed and examples of spectroscopic 'kinks' are given. The construction and operation of a high pressure rig for spectrophotometric measurements of aqueous systems is described in detail. The charge transfer to solvent spectra of potassium iodide in pure water and in aqueous t-butyl alcohol solutions reveals a thermal anomaly over the temperature range 35--60°C. The variation of the frequency of maximum absorption and band width of the charge transfer to solvent spectra of aqueous iodide, with temperature and pressure change, is explained using a simple two state model for liquid water. Supporting evidence for this model has been obtained from near-infrared studies of 6 M HOD/D2O solutions. The visible absorption spectra of Brooker's Dye VII in aqueous t-butyl alcohol solutions is very sensitive to added alcohol and this is attributed to a monomer-dimer equilibrium. The properties of various aqueous mixtures have been investigated using spectrophotometric techniques and the results compared and contrasted with ultrasonic, thermodynamic and other spectroscopic properties of these systems.|
|Rights:||Copyright © the author. All rights reserved.|
|Appears in Collections:||Theses, Dept. of Chemistry|
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