Organically pillared layer framework of [Eu(NH2–BDC)(ox)(H3O)]

Abstract

The non-porous three-dimensional structure of poly[(μ5-2-aminobenzene-1,4-dicarboxylato)(μ6-oxalato)(oxomium)europium(III)], [Eu(C8H5NO4)(C2O4)(H3O)] n or [EuIII(NH2–BDC)(ox)(H3O)] n (NH2–BDC2− = 2-aminoterephthalate and ox2− = oxalate) is constructed from two-dimensional layers of EuIII–carboxylate–oxalate, which are connected by NH2–BDC2− pillars. The basic structural unit of the layer is an edge-sharing dimer of TPRS-{EuIIIO9}, which is assembled through the ox2− moiety. The intralayer void is partially occupied by TPR-{EuIIIO6} motifs. Weak C—H...O and strong, classical intramolecular N—H...O and intermolecular O—H...O hydrogen-bonding interactions, as well as weak π–π stacking interactions, affix the organic pillars within the framework. The two-dimensional layer can be simplified to a uninodal 4-connected sql/Shubnikov tetragonal plane net with point symbol {44.62}.