Chiral Homodinuclear Dysprosium Macrocyclic Complexes with Single‐Molecule Magnetic Behaviours

A pair of enantiomerically chiral dysprosium homodinuclear complexes: [(acac) 4 Dy 2 (R,R,R,R‐L)] ( R‐Dy ) and [(acac) 4 Dy 2 (S,S,S,S‐L)] ( S‐Dy ) (Hacac=acetylacetone) have been synthesized based on macrocyclic chiral ligands (R,R,R,R‐H 2 L or S,S,S,S‐H 2 L), derived from the [2+2] template condensation of 4‐tert‐butyl‐2,6‐diformylphenol, dysprosium acetylacetonate and (1R,2R)‐/(1S,2S)‐1,2‐cyclohexanediamine, respectively. Circular dichroism spectra confirms their enantiomeric chirality. Single‐crystal structures show two crystallographic independent dysprosium(III) ions have square antiprismatic coordination with different D 4d local symmetry. Furthermore, the selected R‐Dy complex owns the slow magnetic relaxation behaviour with the ferromagnetic Dy 3+ ⋅⋅⋅Dy 3+ coupling.