Two copper(II) complexes in equilibrium contribute to the solution EMR
(EPR) spectrum of bis(ethylacetoacetato)copper(II). In the present pa
per? EMR line-widths have been analysed to obtain better insight into
the nature of these two paramagnetic species. The analysis shows that
the EMR anisotropy and rotational correlation times of the two paramag
netic species are similar in magnitude. The EMR anisotropy determined
from line-width studies is compared with that obtained from a frozen s
olution EMR spectrum.