RESUMEN
Controlled dimerization of Mn12 single-molecule magnets (SMMs) was achieved via a synthetic route involving a competition between bridging and terminal ligands, namely, diols and alcohols. The reaction using a 1:1 ratio of the competing ligands resulted in the isolation of a new family of covalently linked dimers of Mn12 SMMs. This is the first step toward the controlled growth of SMM oligomeric arrays.
RESUMEN
The [Mn12O12(O2CR)16(L4)] family (R = various; L = terminal ligand) of clusters holds a special place in molecular magnetism; they are the most well-studied single-molecule magnets (SMMs). Targeted linkage of these SMMs has now been achieved for the first time. The resulting chain structures have been confirmed crystallographically, and the magnetic properties, up to 1.14 GPa, and high-field electron paramagnetic resonance spectra have been collected and analyzed.
RESUMEN
The initial employment of the fluorescent bridging ligand naphthalene-2,3-diol in 4f-metal coordination chemistry has provided access to a new family of Ln(III)8 clusters with a "Christmas-star" topology, single-molecule magnetism behavior, and ligand-centered emissions.
Asunto(s)
Elementos de la Serie de los Lantanoides/química , Naftalenos/química , Ligandos , Estructura Molecular , FotoquímicaRESUMEN
The targeted replacement of acetate groups in the optically inactive [Mn(III)3O(O2CMe)3(mpko)3](ClO4) single-molecule magnet with their naphthalene, anthracene, and pyrene fluorescent analogues has led to three new emissive SMMs with enhanced photoluminescence properties and potential applications in the field of molecular electronics.
Asunto(s)
Ácidos Carboxílicos/química , Complejos de Coordinación/química , Colorantes Fluorescentes/síntesis química , Magnetismo , Manganeso/química , Nanotecnología , Antracenos/química , Colorantes Fluorescentes/química , Ligandos , Naftalenos/química , Pirenos/químicaRESUMEN
[Mn3]2 and [Mn3]4 supramolecular aggregates of weakly exchange-coupled Mn(III)3 single-molecule magnets (SMMs) with S = 6 have been prepared by carboxylate substitution on [Mn3O(O2CMe)3(mpko)3](+) [mpkoH = methyl(pyridine-2-yl) ketone oxime)] with the dicarboxylic acids α-truxillic acid and fumaric acid, respectively. The method opens up a new approach to Mn3 SMM aggregates of various size and topology.