Slow relaxation of magnetization in 3D-MOFs based on dysprosium dinuclear entities bridged by dicarboxylic linkers

Abstract

Three novel metal-organic-frameworks (MOFs) based on dysprosium as the metal and dicarboxylic ligands have been solvothermally synthesized with the aim of studying and modulating their magnetic properties according to the variation of the distances between metal centers. These materials display intense photoluminescence properties in the solid state at room temperature. In addition, a very interesting property of compound 1 is that it exhibits slow relaxation of magnetization with an activation energy barrier of 32 K.Magneto-structural correlations have been analyzed.

Size‐Dependent Self‐Assembly of Lanthanide‐Based Coordination Frameworks with Phenanthroline‐2,9‐dicarboxylic Acid as a Preorganized Ligand in Hybrid Materials

“…The data obtained under zero dc field agree perfectly with the measurement under an applied dc field of 400 Oe, and the individual data points virtually superimpose. The fit of these data to Equation (1) results in an energy barrier of U eff = 37.8 K, which is in good agreement with previous values reported for dysprosium coordination polymers . Although the data obtained at low temperatures indicates the presence of additional relaxation processes, the attempted fits were unsuccessful.…”

“…The fit of these data to Equation (1) results in an energy barrier of U eff = 37.8 K, which is in good agreement with previous values reported for dysprosium coordination polymers. [22] Although the data obtained at low temperatures indicates the presence of additional relaxation processes, the attempted fits were unsuccessful. However, the data indicate that even low-temperature direct or Raman processes must by operative in addition to the expected quantum tunneling.…”

Diaminoterephthalate Fluorescence Dyes – Versatile Tools for Life Sciences and Materials Science

“…Recently, Oyarzabal et al prepared and crystallographically characterized a three dimensional coordination polymer with compound 8 as a bridging linker between dysprosium(III) dimers. Therefore, this material shows apart from interesting luminescence properties also highly promising magnetic features, as are slow relaxation of magnetization with an activation barrier of 32 K …”

Electron Transfer and Electron Excitation Processes in 2,5‐Diaminoterephthalate Derivatives with Broad Scope for Functionalization

“…The DAT building block has been used for studying protein‐protein interactions, such as the dimerization of two molecules of recoverin . DATs were also used as ligands for synthesis of metal complexes and applied as linker compounds for metal organic frameworks (MOF) . Given this broad range of applications, it is important to understand the redox properties of DAT derivatives because they may be exploited in addition to their fluorescence and binding properties.…”