Abstract
Electron spin exchange rate constants and hyperfine coupling constants have been measured for two nitroxide spin probes in a number of isoviscous mixed solvents. Collision rate constants, normalized to 1 cP, are lower for solvents in which the major component is water. Further anomalies in the coupling constant for the systemtert-butanol-water are explained in terms of the marked concentration fluctuations known to occur in this solvent mixture. Substitution of a hydrophobic spin probe by one containing an −OH group leads to lowering of the spin exchange rate, possibly due to solvation of the probe.
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