Crystal structure and supra­molecular features of bis­­{ethyl 2-[1-methyl-3-(pyridin-2-yl)-1H-1,2,4-triazol-5-yl]acetate}­tri­nitratolanthanum(III)

The title lanthanum(III) complex, [La(Et-MPTA)₂(NO₃)₃] {where Et-MPTA is ethyl 2-[1-methyl-3-(pyridin-2-yl)-1H-1,2,4-triazol-5-yl]acetate} or [La(C₂₄H₂₈N₈O₄)(NO₃)₃], crystallizes in the monoclinic space group C2/c (No. 15). The lanthanum atom is twelve-coordinate, bonded to two oxygen atoms from carboxylate groups, four nitrogen atoms from two pyridinyl-1,2,4-triazole ligands, and six oxygen atoms of three NO₃^- anions. The coordination geometry around the lanthanum atom can be described as a distorted icosahedron. Supramolecular features include π-stacking interactions between pyridyl and triazole rings and weak intermolecular N—O⋯C interactions, which lead to the formation of layers parallel to the (101) plane.