Metal (3d)-organic (2p)-hybrid magnets made of Mn(II) ions with tris(aminoxyl) radicals (R's) as bridging ligands 2D complexes [{Mn(hfac)(2)}(3)center dot R-2]

The magnetic properties of three 2D-network complexes [{Mn(hfaC)(2)}(3).R-2 ] have been studied. Tris(aminoxyl) radicals R's have quartet ground states and contribute not only to the formation of the extended network structure s but essentially to the overall magnetism. Antiferromagnetic interactions between Mn(II) and the aminoxyl radicals and ferromagnetic intraradical ami noxyl-aminoxyl interactions both within the layer are responsible for the d evelopment of the characteristic magnetic properties in these heterospin sy stems. Depending on the nature of interlayer interactions, they show either ferro/ferrimagnetic or antiferromagnetic long-range order. The hierarchy o f the different exchange interactions is established and the Mn-aminoxyl ex change integrals were evaluated from analysis of the temperature dependence of their paramagnetic susceptibility. With increasing intraradical exchang e interaction, the complexes exhibit a clearer 2D behavior. (C) 2001 Elsevi er Science B.V. All rights reserved.