We have proposed that such multiple ring assemblies could be used in quantum information processing. One key question in such complex molecules is the coherence times of the proposed qubits; the presence of other paramagnetic units may offer a mechanism for decoherence beyond the usual nuclear hyperfine interaction. In the [7]rotaxanes, the position is potentially more extreme. measured for a simple {Cr7Ni} ring where T1 is typically around 100 µs and Tm around 450 ns. The presence of the S = 12 {Ni12} ring has had little affect on the relaxation times. This could be important if such qubits are to be used in large assemblies.