Synthesis and Characterization of a [Mn12O12(O2CR)16(H2O)4] Complex Bearing Paramagnetic Carboxylate Ligands. Use of a Modified Acid Replacement Synthetic Approach |
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| Authors: | Philippe Gerbier Daniel Ruiz-Molina Neus Domingo David B Amabilino José Vidal-Gancedo Javier Tejada David N Hendrickson Jaume Veciana |
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| Institution: | (1) Institut de Ciència de Materials de Barcelona (CSIC), Campus UAB, E-08193, Cerdanyola, Spain, ES;(2) Facultat de Física, Universitat de Barcelona, Diagonal 647, E-08028 Barcelona, Spain, ES;(3) Department of Chemistry and Biochemistry-0358, University of California at San Diego, La Jolla, California 92093-0358, USA, US |
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| Abstract: | Summary. A new modified approach for the synthesis of Mn12 clusters, based on the use of complex Mn12O12(O2C
t
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•)
t
Bu)16(H2O)4] (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.
Corresponding author. E-mail: vecianaj@icmab.es
Received March 27, 2002; accepted May 2, 2002 |
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| Keywords: | Single-Molecule Magnet Synthesis Paramagnetic ligand Pivalic acid |
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