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

The non-porous three-dimensional structure of poly[(μ₅-2-amino-benzene-1,4-di-carboxyl-ato)(μ₆-oxalato)(oxomium)europium(III)], [Eu(C₈H₅NO₄)(C₂O₄)(H₃O)] or [Eu^III(NH₂-BDC)(ox)(H₃O)] (NH₂-BDC^2- = 2-amino-terephthalate and ox^2- = oxalate) is constructed from two-dimensional layers of Eu^III-carboxyl-ate-oxalate, which are connected by NH₂-BDC^2- pillars. The basic structural unit of the layer is an edge-sharing dimer of TPRS-{Eu^IIIO₉}, which is assembled through the ox^2- moiety. The intra-layer void is partially occupied by TPR-{Eu^IIIO₆} motifs. Weak C-H⋯O and strong, classical intra-molecular N-H⋯O and inter-molecular O-H⋯O hydrogen-bonding inter-actions, as well as weak π-π stacking inter-actions, affix the organic pillars within the framework. The two-dimensional layer can be simplified to a uninodal 4-connected sql/Shubnikov tetra-gonal plane net with point symbol {4⁴.6²}.