Slow magnetic relaxation in one dimensional nitronyl nitroxide-Dy(III) chain suggesting single-chain magnet behavior

Two new nitronyl nitroxide bridged one-dimensional lanthanide complexes [Dy(hfac)3(NIT-2thien)]n (1); [Dy(hfac)3(NIT-3Brthien)]n (2) (hfac = hexafluoroacetylacetonate; NIT-2thien = 2-(2′-thienyl)-4,4,5,5-tetramethyl-imidazoline-1-oxyl-3-oxide; NIT-3Brthien = 2-(3′-bromo-2′-thienyl)-4,4,5,5- tetramethyl-imidazoline-1-oxyl-3-oxide) have been successfully prepared. Single crystal X-ray crystallographic analysis reveals that both complexes consist of linear chains built up by Dy(hfac)3 units bridged by nitronyl nitroxide radicals through their NO groups. AC measurements indicate that two complexes are out-of-phase frequency-dependent suggesting single-chain magnet behavior.

Two new nitronyl nitroxide bridged one-dimensional lanthanide complexes [Dy(hfac)3(NIT-2thien)]n (1); [Dy(hfac)3(NIT-3Brthien)]n (2) have been successfully prepared. Both complexes consist of linear chains built up by Dy(hfac)3 units bridged by nitronyl nitroxide radicals through their NO groups. AC measurements indicate that two complexes are out-of-phase frequency-dependent suggesting single-chain magnet behavior.Figure optionsDownload as PowerPoint slideHighlights
► Two new lanthanide-radical complexes were successfully prepared.
► Both complexes are 1D chains bridged by radicals through their NO groups.
► They are out-of-phase frequency-dependent suggesting SCM behavior.