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

摘要

Two series oflanthanide coordination polymers with formular [Ln(Haip)(ox)(H2O)] (type I) (Ln=Ce(l), 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(ll)) 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 iso-structural and possess 6-connected 2D layer structure with Schlafli symbol (3~6;4~5;5~3). Complexes 8-11 (type II) are also isomorphous and feature 9-connected 3D framework with Schlafli symbol (3~(12);4~(16);5~7;6). The solid-state luminescent properties of 5 and 7 containing Eu~(3+) and Tb~(3+) were measured at room temperature. The magnetic properties show complexes 6 and 8 have antiferromagnetic behavior. Furthermore, infrared (1R), thermogravimetric analyses (TGA), elemental analyses (EA), powder X-ray diffraction (PXRD) of these complexes are also investigated.