Abstract
X-band electron paramagnetic resonance (EPR) studies of Cu 2+ ions in magnesium citrate decahydrate single crystals are done at room temperature. Detailed EPR analysis indicates the presence of only one Cu 2+ site. Cu 2+ is found to take up substitutional position at Mg site. The angular variation of the EPR spectra in three planes a* b, bc and ca* are used to determine principal g and A tensors. The spin Hamiltonian parameters are: g x = 2.0346, g y = 2.1400, g z = 2.3874, A x = 57, A y = 76, A z = 99 (×10 −4) cm −1. The optical absorption study is also carried out at room temperature and absorption bands are assigned to various transitions. The theoretical band positions are estimated using energy expressions and a good agreement is obtained with the experimental values. By correlating EPR and optical data, different molecular orbital coefficients are evaluated and the nature of bonding in the complex is discussed.
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