The heterospin cobalt complexes: peculiarities of high-resolution NMR spectra.

The high-resolution H and C NMR spectra (CHCl solution) of sterically non-rigid heterospin complexes CoL, CoL-dipy, and CoL-phen (where L is 4-(3',3',3'-trifluoro-2'-oxopropylidene)-2,2,5,5-tetramethyl-3-imidazolidine-1-oxyl) have been studied. The specific of the NMR phenomenon in paramagnetic systems is briefly analyzed. It is shown that the NMR spectra modified by hyperfine coupling can be successfully employed for investigation of the complexation processes.