AUTHOR=Chen Jin-Fen , Ge Yi-Liang , Wu Dong-Hui , Cui Hao-Tian , Mu Zhi-Lin , Xiao Hong-Ping , Li Xinhua , Ge Jing-Yuan 

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

JOURNAL=Frontiers in Chemistry

VOLUME=10

YEAR=2022

URL=https://www.frontiersin.org/journals/chemistry/articles/10.3389/fchem.2022.974914

DOI=10.3389/fchem.2022.974914

ISSN=2296-2646

ABSTRACT=<p>A new dysprosium (III) coordination polymer [Dy(Hm-dobdc) (H<sub>2</sub>O)<sub>2</sub>]·H<sub>2</sub>O (<bold>Dy-CP</bold>), was hydrothermal synthesized based on 4,6-dioxido-1,3-benzenedicarboxylate (H<sub>4</sub>m-dobdc) ligand containing carboxyl and phenolic hydroxyl groups. The Dy(III) center adopts an octa-coordinated [DyO<sub>8</sub>] geometry, which can be described as a twisted square antiprism (<italic>D</italic><sub>4d</sub> symmetry). Neighboring Dy(III) ions are interconnected by deprotonated Hm-dobdc<sup>3−</sup> 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 H<sub>2</sub>O molecules. Magnetic studies demonstrates that <bold>Dy-CP</bold> shows the field-induced slow relaxation of magnetization and the energy barrier <italic>U</italic><sub>eff</sub>/<italic>k</italic><sub>B</sub> and relaxation time <italic>τ</italic><sub>0</sub> are 35.3 K and 1.31 × 10<sup>–6</sup> s, respectively. Following the vehicular mechanism, <bold>Dy-CP</bold> displays proton conductivity with σ equal to 7.77 × 10<sup>–8</sup> S cm<sup>−1</sup> at 353 K and 30%RH. Moreover, luminescence spectra reveal that H<sub>4</sub>m-dobdc can sensitize characteristic luminescence of Dy(III) ion. Herein, good magnetism, proton conduction, and luminescence are simultaneously achieved, and thus, <bold>Dy-CP</bold> is a potential multifunctional coordination polymer material.</p>