Abstract
The enneanuclear mixed-valent manganese cage [Mn9O7(OAc)11(thme)(py)3(H2O)2] 1 {Mn9} possesses an S=17/2 ground state as a result of an antiferromagnetic interaction between three ferromagnetically coupled MnIV ions and a wheel of four MnIII and two MnII ions. AC magnetization measurements show a frequency-dependent out-of-phase signal at 3.4 K and 997 Hz, indicative of single-molecule magnetism behaviour. Data obtained from varying the frequency of oscillation of the AC field gives an effective energy barrier (Ueff) for the reversal of magnetization of 27 K. Magnetic measurements of single crystals of 1 at low temperature show time- and temperature-dependent hysteresis loops which contain steps at regular intervals of field. DC and AC relaxation measurements show both the temperature-dependent and temperature-independent regions, the latter being definitive evidence of magnetization tunneling in the lowest energy zero-field split component of the ground state.
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