Abstract
Abstract We report on the magnetic properties of the enneanuclear mixed-valent single-molecule magnet [Mn9O7(OAc)11(thme)(py)3(H2O)2] (1). Using inelastic neutron scattering (INS) spectroscopy, we have confirmed the S = 17/2 cluster ground state of 1. Furthermore, we have determined accurately the anisotropy parameters of the zero field split ground state. The cluster 1 exhibits a strong negative axial anisotropy D [ S ˆ z 2 - S ( S + 1 ) / 3 ] where D = −0.249(5) cm−1. It is necessary to include an axial higher order term ( B 4 0 ) in the effective spin Hamiltonian to account for the experimental data.
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