Two Lanthanide–nitronyl nitroxide radicals compounds with slow magnetic relaxation behavior

• Synthesize two mononuclear tri-spin complexes based on lanthanide ions and nitronyl nitroxide radicals.
• Complex 1 is dodecahedral (DD) geometry; while in complex 2, the geometry is square antiprism (SAPR).
• Complexes 1 and 2 exhibit slow magnetic relaxation, suggesting single-molecule magnet behavior.

Two Lanthanide compounds with nitronyl nitroxide radicals [Dy(hfac)3(NITPh-p-Cl)2·0.5CH3(CH2)5CH3] (1) (hfac = hexafluoroacetylacetonate; NITPh-p-Cl = 4′-chlorphenyl-4,4,5,5-tetramethylimida-zoline-1-oxyl-3-oxide, CH3(CH2)5CH3 is heptane as solvent molecule) and [Tb(hfac)3(NITPh-p-Cl)2] (2) were synthesized and structurally characterized. The X-ray crystallographic analyses show that the structures of the two compounds are similar and all consist of isolated molecules, in which central Ln(III) ions are coordinated to six oxygen atoms from three hexafluoroacetylacetonate ligands and two oxygen atoms from nitronyl nitroxide radicals. Ac magnetic susceptibility studies show complexes 1 and 2 exhibit slow magnetic relaxation, suggesting single-molecule magnet behavior.

Two Lanthanide-radical compounds were synthesized. Complex 1 is dodecahedral geometry; while complex 2 is square antiprism geometry. Two complexes show intramolecular antiferromagnetic interactions and exhibit slow magnetic relaxation behavior.Figure optionsDownload as PowerPoint slide