Abstract
Characterisation and magnetic properties of new metal-radical complexes with bivalent Mn having a general formula {[Mn(hfac)2]m(R)n} are given. In these complexes, the aminoxyl radicals have magnetic, triplet or quartet, ground state and form with Mn2± heterospin structures. They show 1D, 2D and 3D behaviour depending on the crystal structure, chemical formula and molecular structure of radical. In the ordered state, the complexes form a ferrimagnetic structure due to a strong negative coupling between the radical and Mn spins. Magnetic anisotropy in some single crystals was studied. The 3D complex {[Mn(hfac)2]3(3R T)2} with a linear triradica! can be described within a sublattice model of ferrimagnetism, one sublattice of which is formed by 1D chains, while the other consists of magnetically isolated Mn2± ions. Its comparatively high T c = 45 K is accounted for the large interchain exchange interaction (3.9 K) through the isolated Mn2±. Analysis of their paramagnetic properties shows that the higher energy excitations are related to the desintegration of the ferrimagnetic (1/2,5/2,1/2) linear trimer species, which can be isolated in all these compounds.
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