Paramagnetic Resonance Spectra of Some Cupric Salts (I)

Abstract

The paramagnetic resonance spectra of some ammine, ethylenediammine, and pyridine derivatives of hydrated cupric salts were examined, using their single crystals and microwaves of λ=32∼5 mm. In the cases of [Cu(NH₃)₄] SO₄·H₂O and [Cu(en)₂] Cl₂·xH₂O, detailed analysis of spectra was performed using the structural data from x-ray analysis given by Mazzi. In the other cases, analysis was discussed under an assumption of inequivalent magnetic units. Results thus obtained are fully explained by the treatments given by Abragam and Pryce with modified λ, the spin-orbit coupling coefficient, so the forces acting between the central copper ion and the surrounding nitrogen atmos are supposed to be mainly ionic rather than covalent, as in the cases of usual hydrates. Exchange energies between copper ions are also discussed.