2003 | OriginalPaper | Chapter
Synthesis and Characterization of a [Mn12 O12(O2CR)16(H2O)4] Complex Bearing Paramagnetic Carboxylate Ligands. Use of a Modified Acid Replacement Synthetic Approach
Authors : Philippe Gerbier, Daniel Ruiz-Molina, Neus Domingo, David B. Amabilino, José Vidal-Gancedo, Javier Tejada, David N. Hendrickson, Jaume Veciana
Published in: Molecular Magnets Recent Highlights
Publisher: Springer Vienna
Included in: Professional Book Archive
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new modified approach for the synthesis of Mn12 clusters, based on the use of complex [Mn12O12(O2C’Bu)16(H2O)4] (2) as starting material to promote the acidic ligand replacement, is presented here. This new synthetic approach allowed us to obtain complex [Mn12O12(O2CC6H4N(O●)tBU)16(H2O)2] (3),, whose preparation remained elusive by direct replacement of the acetate groups of Mn12Ac (1). Complex 3 bearing open-shell radical units, was prepared to increase the total spin number of its ground state, and consequently, to increase T B , with the expectation that the radical ligands may couple ferromagnetically with the Mn12 core. Unfortunately, magnetic measurements of complex 3 revealed that the sixteen radical carboxylate ligands interact antiferromagnetically with the Mn12 core to yield a S = 2 magnetic ground state.