Characterizing the paramagnetic behavior of Cu2+ doped nickel(II) dipicolinato by using theoretical and experimental EPR and UV–vis studies

In this study, the paramagnetism in bis(hydrogeno pyridine-2,6-dicarboxylato) nickel(II) trihydrate, [Ni(Hdpc)2]·3H2O, has been investigated after doping the sample with Cu2+ ions. The g and hyperfine parameters were obtained by electron paramagnetic resonance (EPR) experiments performed at ambient temperature. The study shows that Cu2+ ion defects the structure and exists interstitially in the lattice having a distorted local environment. It also shows the existence of two magnetically inequivalent Cu2+ sites. Experimental values for both EPR and optical spectrum studies were verified by using the appropriate theoretical approaches.