Abstract
A linear free energy relationship was found betweenv max, the energy of the absorption maximum of chloride, bromide, or iodide ion in various solvents, and the α solvatochromic parameter which is a measure of the hydrogen bond donor ability of the solvent. The relationships are: for chloride,v max=6.99α+50.16 kK; for bromide,v max=5.52α+45.20 kK; for iodide,v max=5.02α+40.33 kK. The correlation ofv max for iodide ion with α gave a larger correlation coefficient and smaller standard deviation than a correlation with the E T (30) parameter of Dimroth. From the values ofv max for iodide ion and the solvated electron in liquid ammonia at 25°C, these correlations indicate a preliminary value of 0.00 for the α parameter of liquid ammonia. This had not been reported before and is lower than expected from a general knowledge of the physical and chemical properties of liquid ammonia but is consistent with a more detailed consideration and recent gas phase measurements of hydrogen bond donor strength.
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Luehrs, D.C., Brown, R.E. & Godbole, K.A. Linear free energy relationship of the energy of the CTTS transition of Halide ions with the solvatochromic parameter α. J Solution Chem 18, 463–469 (1989). https://doi.org/10.1007/BF00657333
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DOI: https://doi.org/10.1007/BF00657333