Self-assembly of a M₄L₆ complex with unexpected S₄ symmetry

Abstract

In a one-pot reaction 1,4-diaminobenzene and 2-formylpyridine, as the reacting subcomponents, self-assemble to a small supramolecular M4L6 pseudo-tetrahedron with unexpected S4 symmetry in the presence of Fe(ii) ions.

Recent Developments in the Preparation and Chemistry of Metallacycles and Metallacages via Coordination

“…An unexpected S 4symmetric cage was synthesized using a similar subcomponent self-assembly strategy by Mal, Rissanen, and co-workers. 105 This strategy was recently used to carefully tune the pore size in a system capable of adopting either M 4 L 4 tetrahedral structures or M 2 L 3 helicates, based on the stoichiometry and reaction conditions used. 106 A triamine was used as the core of a trichelating ligand, formed in one pot with 2-formylpyridine and an Fe(II) source.…”

Encapsulation of Xenon by a Self-Assembled Fe4L6 Metallosupramolecular Cage

“…Recently, we have expanded the same methodology to Co(II) and Ni(II) ions resulting in analogous tetrahedral M 4 L 6 cage complexes with similar host–guest properties . Selecting very small subcomponents and using the same methodology it was possible to construct the smallest possible tetrahedral M 4 L 6 cage …”

Selective Formation of S4- and T-Symmetric Supramolecular Tetrahedral Cages and Helicates in Polar Media Assembled via Cooperative Action of Coordination and Hydrogen Bonds

“…To our delight, in the case of monomers 1a (R = H) and 1b (R = Me), well-defined 1 H NMR spectra were obtained consisting of three sets of resonances of equal integral intensities (Figure c). Based on symmetry arguments, it was assigned to the exclusive formation of the S 4 -symmetric M 4 L 12 cage . The downfield chemical shifts of the N–H resonances clearly indicate the establishment of quadruple H-bonds.…”

“…Based on symmetry arguments, it was assigned to the exclusive formation of the S 4 -symmetric M 4 L 12 cage. 19 The downfield chemical shifts of the N-H resonances clearly indicate the establishment of quadruple H-bonds. In addition, DOSY NMR analysis was also in agreement with the presence of a single species.…”