Abstract
In contrast to previous reports, the e.s.r. and polarised electronic spectrum of Ba2Cu(HCO2)6·4H2O show the presence of a small rhombic perturbation (α= 2·5°). The order of the one-electron orbital energies is dx2y2 > dz2 > dxy > dxz > dyz. The polarised spectrum of Cu(HCO2)2·4H2O is very similar and leads to the same energy order, except that dxz and dyz are degenerate. From the g-factors and the electronic energies, values of the anisotropic spin-orbit reduction parameters are obtained which suggest that these coefficients are not only dependent upon electron delocalisation.

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