We report the combined measurements of the dc susceptibility 0 , the ac susceptibility Ј, and the NMR relaxation rate T 1 −1 for the molecular-based heterometallic single-chain magnet ͓Mn͑saltmen͔͒ 2 ͓Ni͑pao͒ 2 ͑py͒ 2 ͔͑PF 6 ͒ 2 . At low temperatures, this system is well described by a one-dimensional array of effective spin S = 3 chains comprising the Mn III -Ni II -Mn III trimers and treated as the S = 3 Ising chain with the single-ion term ͑Blume-Capel model͒. Using the exact solution of the model and based on the picture that the random motion of the local domain walls dominates the low-temperature spin dynamics, we succeeded in reproducing the experimental results of the dc susceptibility 0 , the ac susceptibility Ј, and the 19 F-NMR relaxation rate T 1 −1 in a consistent manner.
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