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)

Abstract

The crystal structure of a mononuclear 12-coordinate lanthanum(III) complex with a pyridinyl-1,2,4-triazole derivative is reported and discussed.

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.