Abstracts 2005

Abstract of Publication No. 500

Reto Basler, Andreas Sieber, Grégory Chaboussant, Hans U. Güdel, Nicole E. Chakov, Monica Soler, George Christou, Arnaud Desmedt and Ruep Lechner
Inelastic Neutron Scattering Study of Electron Reduction in Mn12 Derivatives
Inorg. Chem. 44, 649-453 (2005)      Full Text (PDF)      DOI-Link     

Abstract: We report inelastic neutron scattering (INS) studies on a series of Mn12 derivatives, [Mn12O12(O2CC6F5)16(H2O)4]z, in which the number of unpaired electrons in the cluster is varied. We investigated three oxidation levels: z = 0 for the neutral complex, z = -1 for the one-electron reduced species and z = -2 for the two-electron reduced complex. For z = 0, the ground state is S = 10 as in the prototypical Mn12-acetate. For z = -1, we have S = 19/2, and for z = - 2, an S = 10 ground state is retrieved. INS studies show that the axial zero-field splitting parameter D is strongly suppressed upon successive electron reduction: D = -0.45 cm–1 (z = 0), D = -0.35 cm–1 (z = -1), and D -0.26 cm–1 (z = -2). Each electron reduction step is directly correlated to the conversion of one anisotropic (Jahn-Teller distorted) Mn3+ (S = 2) to one nearly isotropic Mn2+ (S = 5/2).

Last modified: 13.12.11 by Gabriela Frei