Tris[2-(2H-indazol-2-yl)ethyl]amine

Abstract

The title tertiary amine, C27H27N7, a potential tripodal ligand for coordination chemistry, crystallizes with the central N atom located on a threefold axis of a trigonal cell. The gauche conformation of the N(amime)—CH2—CH2—N(indazole) chain [torsion angle = −64.2 (2)°] places the pendant 2H-indazole heterocycles surrounding the symmetry axis, affording a claw-like shaped mol­ecule. Two symmetry-related indazole planes in the mol­ecule make an acute angle of 60.39 (4)°. The lone pair of the tertiary N atom is located inside the cavity, and should thus be inactive (as a ligand). In the crystal, neither significant π–π nor C—H⋯π inter­actions between molecules are found.

The nickel, copper and zinc complexes of a potentially heptadentate nitrogen donor ligands

“…Ring closures of this type have been reported before. Ovalle et al reported on the attempted synthesis of L 4 using a synthesis similar to the one reported here [25]. In their study they attempted to purify the polydentate amine using column chromatography (silica).…”