Two-dimensional dysprosium(III) coordination polymer: Structure, single-molecule magnetic behavior, proton conduction, and luminescence

A new dysprosium (III) coordination polymer [Dy(Hm-dobdc) (H2O)(2)]& BULL;H2O (Dy-CP), was hydrothermal synthesized based on 4,6-dioxido-1,3-benzenedicarboxylate (H(4)m-dobdc) ligand containing carboxyl and phenolic hydroxyl groups. The Dy(III) center adopts an octa-coordinated [DyO8] geometry, which can be described as a twisted square antiprism (D (4d) symmetry). Neighboring Dy(III) ions are interconnected by deprotonated Hm-dobdc(3-) ligand to form the two-dimensional infinite layers, which are further linked to generate three-dimensional structure through abundant hydrogen bonds mediated primarily by coordinated and lattice H2O molecules. Magnetic studies demonstrates that Dy-CP shows the field-induced slow relaxation of magnetization and the energy barrier U (eff)/k (B) and relaxation time tau (0) are 35.3 K and 1.31 x 10(-6) s, respectively. Following the vehicular mechanism, Dy-CP displays proton conductivity with sigma equal to 7.77 x 10(-8) S cm(-1) at 353 K and 30%RH. Moreover, luminescence spectra reveal that H(4)m-dobdc can sensitize characteristic luminescence of Dy(III) ion. Herein, good magnetism, proton conduction, and luminescence are simultaneously achieved, and thus, Dy-CP is a potential multifunctional coordination polymer material.