Effect of lanthanide contraction on structures of lanthanide coordination polymers based on 5-aminoisophthalic acid and oxalate

Two series of lanthanide coordination polymers with formular [Ln(Haip)(ox)(H2O)] (type I) (Ln = Ce(1), Pr(2), Nd(3), Sm(4), Eu(5), Gd(6), Tb(7)) and [Ln2(aip)2(ox)(H2O)]·H2O (type II) (Ln = Dy(8), Ho(9), Er(10), Tm(11)) have been synthesized by hydrothermal reactions of 5-aminoisophthalic acid (H2aip) and oxalate (ox) with corresponding lanthanide nitrates or lanthanide oxides. Complexes 1–7 (type I) are isostructural and possess 6-connected 2D layer structure with Schläfli symbol (36;46;53). Complexes 8–11 (type II) are also isomorphous and feature 9-connected 3D framework with Schläfli symbol (312;416;57;6). The solid-state luminescent properties of 5 and 7 containing Eu3 + and Tb3 + were measured at room temperature. The magnetic properties show complexes 6 and 8 have antiferromagnetic behavior. Furthermore, infrared (IR), thermogravimetric analyses (TGA), elemental analyses (EA), powder X-ray diffraction (PXRD) of these complexes are also investigated.