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

The title lanthanum(III) complex, [La(Et-MPTA) 2 (NO 3 ) 3 ] {where Et-MPTA is ethyl 2-[1-methyl-3-(pyridin-2-yl)-1 H -1,2,4-triazol-5-yl]acetate} or [La(C 24 H 28 N 8 O 4 )(NO 3 ) 3 ], crystallizes in the monoclinic space group C 2/ 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 NO 3 − 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 ( 1 01) plane.