Towards solvent tuning of slow magnetic relaxation and ferroelectric properties in a dysprosium metal organic framework system

A new dysprosium metal organic framework {[Dy-2(L-3(H2O)(4)] center dot (acetone)(2) center dot (H2O)(3)}(n) (Dy-2-Acetone) with single-molecule magnet and ferroelectric properties was synthesized through a solvent-induced single-crystal-tosingle-crystal (SCSC) transformation. Notably, exchange of the coordinated and guest solvent molecules lead to different magnetic relaxation and ferroelectric properties in the dysprosium MOF system, Dy-2-DMF and Dy-2-Acetone. Study reveals that the tunable magnetic relaxation behaviors are most likely a result of different local coordination sphere and lattice solvent molecules within the pores which influenced and tuned the relaxation rates of the magnetization. Moreover, disparate polar solvent molecules confined in the MOFs may be the key factors for their different ferroelectric properties.