Recent Developments in CoIII2LnIII2 Single‐Molecule Magnets. Issue 20 (22nd May 2018)

• Record Type: Journal Article
• Authors: Funes, Alejandro V.; Alborés, Pablo
• Is Part Of: European journal of inorganic chemistry. Issue 20/21(2018)
• Page Start: 2067
• Page End: 2089
• Publication Date: 2018-05-22
• Subjects: Cobalt -- Lanthanides -- Single‐molecule magnets -- Magnetic properties -- Slow relaxation; Chemistry, Inorganic -- Periodicals; Organometallic chemistry -- Periodicals; Bioinorganic chemistry -- Periodicals; Solid state chemistry -- Periodicals; 546
• DOI: 10.1002/ejic.201800253
• Languages: English
• ISSNs: 1434-1948

Abstract

Abstract : In this work we review the Co2 III Ln2 III family of compounds reported up to date that shows SMM features. The vast majority of them show a butterfly arrangement with Ln III ions placed at the body positions. The number of Dy III examples constitutes the majority, probably because of the intrinsic properties of this lanthanide ion regarding SMMs characteristics. Butterfly complexes have a SAP geometry around Ln III ions with a variety of distortion degrees. However, when looking at the key U eff parameter trend through this family of complexes, it becomes clear that a pure geometrical consideration is not enough to explain it. Ab initio based calculations provide evidence of highly anisotropic m J ground states for complexes where Ln III = Dy III, pointing to exclusively m J = 15/2 ground Kramers doublets. These calculations also agree with the thermally activated relaxation involving the first excited state and, in some examples where multiple relaxation pathways are observed, higher excited states. A few examples prove that Raman and/or direct mechanisms cannot be discarded a priori. Only two examples of isostructural Ln III families of the same Co2 III Ln2 III complex can be found. Abstract : We review the Co2 III Ln2 III family of compounds reported up to date that shows SMM features, emphasizing structural variety and its relationship with magnetization slow relaxation processes, discussing experimental and theoretical information.