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In the present work, we investigate the quantum thermal entanglement inmolecular magnets composed of dimers of spin $S$, using an Entanglement Witnessbuilt from measurements of magnetic susceptibility. An entanglementtemperature, $T_{e}$, is then obtained for some values of spin $S$. From this,it is shown that $T_{e}$ is proportional to the intradimer exchange interaction$J$ and that entanglement appears only for antiferromagnetic coupling. Theresults are compared to experiments carried on three isostructural materials:KNaMSi$_{4}$O$_{10}$ (M$=$Mn, Fe or Cu).

Entanglement temperature in molecular magnets composed of S-spin dimers