ESR measurements of the partitioning of some new spin probes in n-octanol-water
Bottle, Steven E., Gillies, Duncan G., Micallef, Aaron S., Reid, Damien A., & Sutcliffe, Leslie H. (1999) ESR measurements of the partitioning of some new spin probes in n-octanol-water. Magnetic Resonance in Chemistry, 37(10), pp. 730-734.
The stable free radical 1,1,3,3-tetramethylisoindolin-2-yloxyl (TMIO) has proved to be very suitable for use as a spin probe for a number of applications. Because it is soluble mainly in non-polar liquids, there is a need for new derivatives that can be used in a variety of environments. This has been done by introducing substituents in the 5-position of the aromatic ring, namely carboxyl (CTMIO), trimethylamino (TMTMIOI) and sodium sulphonate (NaTMIOS). An accurate ESR method was developed for the measurement of partition coefficients in n-octanol–water. For comparison purposes the method was also applied to some Tempo derivatives. The effect of temperature on the rotational correlation times and the nitrogen-14 hyperfine coupling constant of some of the spin probes was investigated. There is evidence for dimerization of CTMIO to form a biradical
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