Three rare Ln-Na heterometallic 3D polymers based on sulfate anion: Syntheses, structures, and luminescence properties

Three Ln-Na heterometallic 3D polymers based on sulfate anion, [LnNa(SO4)(2)(H2O)1 (Ln = Gd (1); Tb (2); Dy (3)), were synthesized under hydrothermal conditions, which are the first examples of Ln-Na sulfates. These compounds crystallize in the trigonal P3(1)21 space group, and display a 6-connected sma topological structure with a Schafli symbol of (4(10).6(5)). The characteristic analyses reveal that compounds 1-3 display excellent thermal stability, and all exhibit antiferromagnetic interactions between the metal centers. The luminescent properties of 2 and 3 show the characteristic terbium and dysprosium luminescence. The strong luminescence in the green light (D-5(4) -> F-7(5)) region for 2 and blue light (F-4(9/2) -> H-6(15/2)) region for 3 indicate that they may be excellent candidates for green or blue fluorescent materials. (C) 2015 Elsevier B.V. All rights reserved.