Abstract
THE effect of ionic solutes on the structure of water has been of considerable interest to electrochemists for a number of years1–3. Especially intriguing has been the anomalous behaviour of tetra alkyl ammonium salts. In order to account for the apparent molal heat capacities2 and large negative entropies of hydration1, Frank and Wen2 have proposed that the apolar groups of these solutes exert a net ‘structure-making’ influence on surrounding water molecules in addition to the structural changes (that is, primary hydration) associated with the electric field of the ions. If the extent of structure-making is significant it might be expected that the correlation time, τC, for fluctuations of the local magnetic environment and hence the spin-lattice relaxation time, T1, for water protons would alter appreciably4.
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References
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DANYLUK, S., GORE, E. Proton Magnetic Relaxation Times of Aqueous Tetra Alkyl Ammonium Halide Solutions. Nature 203, 748–749 (1964). https://doi.org/10.1038/203748a0
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DOI: https://doi.org/10.1038/203748a0
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