Crystal structure and supra-molecular features of bis-{ethyl 2-[1-methyl-3-(pyridin-2-yl)-1H-1,2,4-triazol-5-yl]acetate}-tri-nitratolanthanum(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)-1H-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 C2/c (No. 15). The lanthanum atom is twelve-coordinate, bonded to two oxygen atoms from carboxyl-ate groups, four nitro-gen 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 icosa-hedron. Supra-molecular features include π-stacking inter-actions between pyridyl and triazole rings and weak inter-molecular N-O⋯C inter-actions, which lead to the formation of layers parallel to the (101) plane.