A series of novel chiral lanthanide coordination polymers with channels constructed from 16Ln-based cage-like building units

Abstract

Seven novel coordination polymers, [Ln(tda)(H₂O)]_n·2nH₂O [Ln = La(1), Ce(2), Pr(3), Nd(4), Eu(5), Sm(6) and Gd(7)] (H₃tda = 1H-1,2,3-triazole-4,5-dicarboxylic acid), have been synthesized under hydrothermal conditions and characterized by elemental analysis, IR, thermogravimetric analysis (TGA), and single-crystal X-ray diffraction. Compounds 1–7 are isostructural and exhibit novel 3D chiral framework based on the linkage of chiral columns constructed from the interweaving two different kinds of helical chains. Interesting channels exist like labyrinths in the frameworks formed by interconnecting 16Ln-based cage-like building units. Furthermore, the photoluminescence property of 6 and the magnetic property of 7 have been studied.