Abstract
Proton spin-lattice relaxation (NSLR) measurements have been performed in two molecular copper magnetic rings containing 6 and 8 spins (S=1/2), respectively, in an almost coplanar arrangement in order to probe the spin dynamics of the spins in the ring. The NSLR results obtained in the Cu6 and Cu8 rings as a function of temperature and of applied magnetic field are compared with previous results of NSLR of H1 in the iron(III) rings Fe6 and Fe10 (S=5/2). At room temperature, common features are found in the spin dynamics while at low temperature, when correlation effects become important, important differences are observed in the rings depending on the kind of coupling between magnetic spins (ferromagnetic or antiferromagnetic) and on the spin value S.
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