Study of the influence of nuclear spin and dilution over the slow relaxation in a 3d4f heterobimetallic single-molecule magnet

The effects of isotopic enrichment and magnetic dilution have been investigated in a heterobimetallic complex of formula [(Zn2L2DyCl3)-Dy-A]center dot 2H(2)O (ADyZn(2)) (A = 162 and 163) presenting slow relaxation of the magnetization. Isotopic substitution for Dy-162 = 0) and Dy-163 (I = 5/2) leads to a shift in the relaxation times depending on the suppression or enhancement of the hyperfine interactions. The release of the dipolar interactions through magnetic dilution in a Y(iii)-based matrix enhances the slow relaxation of the magnetization and the visibility of the nuclear spin effect. A comparison of the hysteresis loop at 0.5 K for bulk and diluted analogues of pure isotopically enriched complexes suggested a role of the nuclear spin in the interaction between the active system and the matrix.

Automated summary

The effects of isotopic enrichment and magnetic dilution on a heterobimetallic complex were investigated. Isotopic substitution and magnetic dilution changed the relaxation times, showing the role of nuclear spin in the interaction between the active system and the matrix.