Exchange parameters of five-spin clusters of Cu(II) coordination compounds with imidazoline nitroxide radicals

The exchange Heisenberg interaction parameters have been determined from theoretical analysis of the temperature dependence of magnetic susceptibility of coordination cluster compounds Cu(hfacac)₂]₃(Li⁽ⁱ⁾)₂ (hfacac is hexafluoroacetylacetonate, L⁽ⁱ⁾ are 3-imidazoline nitroxides). Upon coordination of both N O oxygens and heterocycle N(3) atoms by Cu²⁺ ions, the interactions are ferromagnetic in nature and have the same order of magnitude. The minor intercluster interactions are antiferromagnetic.Institute of Chemical Kinetics and Combustion, Siberian Branch, Russian Academy of Sciences. International Tomography Center. Institute of Inorganic Chemistry, Siberian Branch, Russian Academy of Sciences. Translated fromZhurnal Strukturnoi Khimii, Vol. 34, No. 3, pp. 70–74, May–June 1993.Translated by L. Smolina