The crystal structure of N5O3 cryptand

Abstract

The title compound, 1,4,13,22,27-pentaaza-6,9:17,20:29,32-tribenzo-10,16,33-trioxabicyclo [11,11,11] pentatriacontane (C₃₃H₄₅N₅O₃), is synthesized by [1+1] tripodal condensation of trialdehyde (4,4′,4″-triformyl-triphenoxytriethylamine) with tris(2-aminoethyl)amine (tren) in the presence of La(NO₃)₃·6H₂O as a template, followed by reduction with KBH₄. There are six unique molecules in the unit. The molecule has a threefold symmetry axis passing through the bridgehead nitrogen atoms in the structure. As a result, only one strand of the cryptand molecule is present in the asymmetric unit. The structure presents an endoendo conformation, with the distance between the two bridgehead nitrogen atoms of 10.030(8) Å.