Under hydrothermal conditions,a series of three-dimensional Zn–Ln heteronuclear complexes,namely,{[Ln2Zn?Pzdc?4?H2O?6]·2H2O}n?Ln=La?1?,Pr?2?,Nd?3?,Sm?4?,Eu?5?,Gd?6?,Tb?7?,Dy?8??,were synthesized by the one-pot reactions of2,3-pyrazine dicarboxylic acid?H2Pzdc?with LnCl3·nH2O and Zn?NO3?2·6H2O in this paper.The corresponding complexes were tested by IR,TG,elemental analysis,single crystal X-ray diffraction,and powder X-ray diffraction.The results showed that the eight target complexes were synthesized.The single crystal data of the complexes 1,2,4,5,and 7 were obtained.Single crystal X-ray diffraction and powder X-ray diffraction analyses indicate complexes 1–8are isostructural,and exhibit a three-dimensional framework structure with the parallel quadrilateral channels and{4.6^2}2{4^2.6^2.8^2}{6^3}2{6^5.8}2 topology,in which the central Ln?III?ion is nine-coordinated by four oxygen atoms and two nitrogen atoms from four ligands and three oxygen atoms from three coordinated H2O molecules and the central Zn?II?ion is six-coordinated by four oxygen atoms and two nitrogen atoms from four ligands.The photophysical properties related to the electronic transition for complexes 4,5,7,and 8 were studied by using excitation spectrum,emission spectrum,and emission lifetime.Under the specific excitation wavelengths,complexes 4,5,7,and 8 show the characteristic emission peaks of Sm3+,Eu3+,Tb3+,and Dy3+,respectively,indicating that the 2,3-pyrazine dicarboxylic acid ligand can effectively sensitize the luminescence of rare earth ions in the visible area. |