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Four isostructural lanthanide coordination polymers with a phenylacetate (PAA−) ligand, [Ln(PAA)3(H2O)]n (Ln = Eu (1); Gd (2); Tb (3); Dy (4)), were synthesized under hydrothermal conditions. Complexes 1–4 display a one-dimensional (1D) wave chain structure bridged by the carboxylate of the PAA− ligand, which was generated via the in situ decarboxylation of phenylmalonic acid. Magnetic studies suggest the presence of ferromagnetic Ln…Ln coupling in the 1D chain of 1–4. Meanwhile, 2 has a significant cryogenic magnetocaloric effect with the maximum −ΔSm of 26.73 at 3 K and 7 T, and 3 and 4 show interesting spin-glass behavior, which is rarely reported for Ln-containing complexes. Additionally, the solid-state photophysical properties of 1 and 3 display strong characteristic Eu3+ and Tb3+ photoluminescence emission in the visible region, indicating that Eu- and Tb-based luminescence are sensitized by the effective energy transfer from the ligand to the metal centers. [ABSTRACT FROM AUTHOR]

Two novel lanthanide−sulfate compounds, [Ln 2 (SO 4 ) 3 (H 2 O) 8 ] (Ln = Tb ( 1 ) and Dy ( 2 )), have been synthesized under hydrothermal reactions. X-ray crystal structure analyses reveal that 1 and 2 are isomorphous and crystallize in monoclinic C 2 /c pace group, showing a layered structure. The layers bear a rare quasi-honeycomb metal arrangement, which is fastened by μ 3 = η 1 : η 1 : η 1 and μ 2 = η 1 : η 1 sulfates. If assigning the μ 3 = η 1 : η 1 : η 1 sulfate as a 3-connected node and the Ln 3+ ion as a 4-connected node, the network can be rationalized as a binodal (3,4)-connected V 2 O 5 topology with a Schäfli symbol of (4 2 ·6 3 ·8) (4 2 ·6). In addition, the infrared, thermogravimetric analysis and luminescent properties were also studied. Complexes 1 and 2 exhibit outstanding thermal stability and characteristic terbium and dysprosium luminescence. [ABSTRACT FROM AUTHOR]