The preparation and physical characterization are reported for a novel single-molecule magnet [Mn12O12(OAc)12(dpp) 4] (dppH = diphenyl phosphate) with no coordinating water molecules. The crystal structure analysis reveals that there are four five-coordinate MnIII ions with Mn⋯H approaches. Addition of water in CD 2Cl2 solution was monitored by 1H NMR, which showed that H2O could coordinate to a vacant site of a five-coordinate MnIII ion in solution. The measurements and analyses of magnetization hysteresis and ac magnetic susceptibility indicate that the title complex is a single-molecule magnet with a quantum tunneling behavior, whose ground state was tentatively assigned to S = 10 with g = 1.78 and D = -0.60 K.
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