The UV ndash Vis spectra of the metal complexes in

The EPR spectra arising from divalent mononuclear manganese usually show splitting into 6 hyperfine components separated by about 70–100 G. If the intrinsic linewidth is larger than the splitting, the six hyperfine components overlap giving a single broad (over 800 G) EPR line. In the present case, at room temperature, the linewidth (ΔH ∼ 900 G) is similar than that Efavirenz value. This indicate that the observed signal originate from isolated paramagnetic manganese(II) ions.