The cluster compounds ${\mathrm{Nb}}_6$${\mathrm{I}}_{11}$ and H${\mathrm{Nb}}_6$${\mathrm{I}}_{11}$ exhibit a coupled structural and electronic phase transition. The structural deformation is accompanied by a crossing of electronic levels which leads to a reduction of the spin degeneracy. We expect such level-crossing transitions to occur in other compounds containing transition-metal clusters.

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