In order to rationalize the low hyperfine value for the parallel component of copper nucleus, another system with lithium as host has been investigated using Electron Paramagnetic Resonance (EPR) technique. Single crystal EPR studies have been carried out at 300 K on Cu(II) doped glycine lithium sulphate system. Angular variation of hyperfine structure lines in the three orthogonal planes show the presence of two sites which are magnetically inequivalent but chemically equivalent with g and A values as: g xx = 2.084, g yy = 2.057, g zz = 2.311 and A xx = 8.96 mT, A yy = 3.26 mT, A zz = 15.95 mT respectively. The impurity entered the lattice interstitially. The admixture and molecular coefficients are evaluated by collaborating EPR data with optical data.

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Results of EPR and optical studies of VO2+ doped in bis (glycine) cadmium(II) chloride, belonging to a third site as a substitutional one are reported. The spin Hamiltonian parameters obtained for the site are gzz= 1.9159, gyy= 1.9695, gxx= 1.9853, Azz= 210.4 G, Ayy= 109.8 G, and Axx= 107.0 G. By correlating the EPR and spectral data, the molecular orbital bonding parameters have been evaluated.

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