Two temperature-dependent 2D heterometallic Cd(Ⅱ)-Dy(Ⅲ)coordination polymers exhibiting slow magnetic relaxation and luminescence properties

作者：Zhongyi Li^*; Jiahui Bu; Ran Zhang; Chi Zhang; Dongqing Wu; Bin Zhai^*

来源：Journal of Rare Earths, 2023, 41(04): 613-620.

Two unique two-dimensional(2D) Cd(Ⅱ)-Dy(Ⅲ) heterometallic coordination polymers,{[DyCd(HPMA)(PMA)2(H2O)4]·2H2O}n(1) and [DyCd(PAA)(PMA)2(H2O)3]n(2,PAA-=phenylacetate),were prepared successfully based on the phenylmalonic acid(H2PMA).The construction of two polymers is sensitive to the reaction temperature and can be synthesized directionally at room temperature and 90℃,respectively.Complexes 1 and 2 display 2D layer structures that include dinuclear [Dy2] cluster node and Dy(Ⅲ)-based 1D zigzag chain motif severally.The Dy(Ⅲ)-based units in two structures both are spaced well with the adjacent ones by the diamagnetic Cd(Ⅱ)-based moieties.The magnetic studies reveal that 1 and 2both display slow magnetic relaxation with temperature-dependent relaxation peaks producing an effective energy barrier(Δτ) of 74.5 and 32.1 K,separately.Furthermore,the solid-state photophysical properties of 1 and 2 show strong characteristic luminescent emissions of Dy(Ⅲ) ion in the visible region.