Complexes of bispyrazolylpyridine are known to undergo spin crossover, and there is evidence that the counterion may play a role in this process. Herein we report 19F NMR studies to determine the degree of counterion association in solution, as a function of the solvent dielectric. By examining the 19F NMR relaxation of a set of fluorine-containing counterions associated with Co(1-bpp)2, the average metal-fluorine distance could be monitored. The implications of the results with respect to the spin-crossover phenomenon will be discussed.

NMR studies of the dielectric effect of solvents on counterion association

251st National Meeting (2016)

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