Rational Design and Synthesis of a Chiral Lanthanide-Radical Single-Chain Magnet.

By the reaction of an enantiopure nitronyl nitroxide radical, 2-((1 R)-(-)-myrtenal)-4,4,5,5-tetramethylimidazolin-1-oxyl-3-oxide), abbreviated as (1 R)-(-)-myrtenal-NIT, and Dy(hfac)3·2H2O (hfac = hexafluoroacetylacetonate), we successfully obtained a homochiral DyIII-radical chain compound [Dy(hfac)3(1 R)-(-)-myrtenal-NIT] n (1) with full characterization. 1 crystallizes in the chiral P21 space group and exhibits slow magnetization relaxation, holding an effective energy barrier (Δτ/ kB) of 64.6 K (44.9 cm-1) and an attempt time τ0 of 1.0 × 10-7 s. The correlation energy (Δξ/ kB) of this chain is 10.4 K (7.2 cm-1), and the effective Curie constant is 2.8 cm3·K·mol-1. Additionally, 1 exhibits temperature-dependent hysteresis loops below 4 K, with a maximum coercive field of 0.51 T at 2 K.