Dysprosium (III) based one-dimensional zigzag chain exhibiting slow magnetic relaxation

Abstract

Macrocyclic ligand containing mononuclear Dy(III) complexes are bridged using dhbq2− (H2dhbq = 2,5 dihydroxy benzoquinone) moiety to form a ten-coordinated one-dimensional dysprosium chain. In the chain complex [{(C52H48BDyN6O4)(C24H20B)}n, complex 1], Dy(III) ions are arranged in a zigzag form by orthogonal arrangements of two adjacent dhbq2− ligands. The macrocyclic ligand and dhbq2− bridging ligand provides an equatorial and axial crystal field towards the Dy(III) ion respectively. The magnetic study reveals that complex 1 shows field-induced slow magnetic relaxation with a 16 K energy barrier at 0.1 T applied dc field. The magnetic relaxation mainly occurred via the Raman pathway which was further confirmed by ab initio calculation. Though the ab initio calculation provides the presence of high axiality around the Dy(III) ion, the random orientation of the anisotropic gz axes makes the complex less anisotropic in nature.