The magnetic properties of polymers prepared by polymerization of the magnetic cluster Mn 12 O 12 (acrylate) 16 with various portions of ethyl acrylate as co-monomer are reported. According to SAXS studies, the clusters are homogeneously distributed in the polymer. Ac susceptibility measurements show superparamagnetlike behaviour of the cluster-crosslinked polymers with relaxation following an Arrhenius law with t 0 ~4-8 6 10 28 s and an energy barrier in the range 45-65 K.

Reaction of [Ti 7 O 4 (OEt) 20 ] with benzoic acid results in the formation of the new cluster [Ti 6 O 4 (OEt) 14 (OOCPh) 2 ] with concomitant rearrangement of the cluster structure. The molecular structure of the new cluster was determined by

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