Abstract
Single crystal EPR investigations of Cu(II) dimeric systems having trigonal bipyramidal coordination were reported. Ligand field theory incorporating `d–s' admixture was developed to derive spin Hamiltonian parameters, namely, g and hyperfine parameters. From analysis of EPR spectra in different crystallographic planes following the method of Buluggiu et al. (Phys. Stat. Sol (b), 1971, 45, 217) g-parameters and fine structure parameter were derived. Ligand field analysis of g-parameters have shown that d–s admixture is quite substantial. The exchange in the excited state derived from fine structure parameter is shown to the antiferromagnetic and is much larger in value (194.2 cm −1) compared to that in the antiferromagnetic ground state (82.6 cm −1).
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