Covalence Effect on the Second Moments of the ESR Absorption Curves. Case ofNa4[CuII(NH3)4][CuI(S2O3)2]2
Physical Review1969Vol. 179(2), pp. 289–294
Abstract
An extension of Van Vleck's theory of the second moments of ESR absorption curves is presented for the case of complex ions, in which the covalence effects are important. The model takes into account that, in a complex ion, the unpaired spin is localized not only at the central metal, but also at the ligands. The calculations, for a single crystal of ${\mathrm{Na}}_{4}$[${\mathrm{Cu}}^{\mathrm{II}}$ ${(\mathrm{N}{\mathrm{H}}_{3})}_{4}$] ${[{\mathrm{Cu}}^{\mathrm{I}}{({\mathrm{S}}_{2}{\mathrm{O}}_{3})}_{2}]}_{2}$, yield a 30% smaller dipolar contribution to the second moments than the usual model, and this is in encouraging agreement with the experimental data.
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