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Identifier

000398818

Title

Σύνθεση, χαρακτηρισμός και μελέτη ετερομεταλλικών μονοδιάστατων αλυσίδων Cr(III)/Ln(III) με βάσεις Schiff του 2-αμινο-ισοβουτυρικού οξέος

Alternative Title

Synthesis, characterization and studies of heterometallic 1D chains Cr(III)/Ln(III) with Schiff bases of 2-amino-isobutyric acid

Author

Κακαρώνη, Φωτεινή Ε.

Thesis advisor

Μήλιος, Κωνσταντίνος

Reviewer

Δημάδης, Κωνσταντίνος
Τρικαλίτης, Παντελής

Abstract

The synthesis and study of polynuclear clusters and coordination polymers based on chromium ions, continues to attract significant research interest. Chromium-based single-molecule magnets (SMMs) and single-chain magnets (SCMs), are rare due to the isotropic nature of the Cr³⁺ ion. It has recently been shown, however, that the synthesis of polynuclear Cr(III)/Ln(III) type compounds, combining anisotropic Ln³⁺ with isotropic Cr³⁺ ions can result in SMM behaviour with large anisotropy barriers and relatively high blocking temperatures. Here, we report the solvothermal synthesis of six new heterometallic Cr(III)/Ln(III) 1D polymers, and we study their magnetic properties, from the reaction of salicylaldehyde and 2-aminoisobutyric acid with [Cr₃O((CH₃)₃CCOO) ₆ (H₂O) ₃]NO₃ and Ln(NO₃)₃ in methanol and in the presence of base, occured dark red complexes. All polymers were characterized by Single-Crystal X-Ray Crystallography, Elementary Analysis, DC and AC magnetic susceptibility measurements, IR spectroscopy and P-XRD measurements. The dc magnetic susceptibility studies for polymers 3, 4 and 5 revealed dominant antiferromagnetic interactions within the metallic centers. Furthermore, ac magnetic susceptibility studies indicated that the complexes do not exhibit slow relaxation of the magnetization.

Language

Greek

Subject

Chromium

Coordination polymers

Lanthanides

Magnetic properties

Single chain magnets (SCMs)

Single molecule magnets (SMMs)

Λανθανίδια

Μαγνήτες μοναδικής αλυσίδας (ΜΜΑ)

Μαγνήτες μοναδικού μορίου (ΜΜΜ)