A Tetrahedron from Homooxacalix[3]arene, the Fifth Platonic Polyhedron from Calixarenes and Uranyl

Overview

Journal Front Chem

Specialty Chemistry

Date 2023 May 8

PMID 37153526

Authors

Jin-Cheng Wu

Eduardo C Escudero-Adan

Marta Martinez-Belmonte

Javier de Mendoza

Affiliations

Soon will be listed here.

Abstract

A self-assembled tetrahedral cage results from two -symmetry building blocks, namely, homooxacalix[3]arene tricarboxylate and uranyl cation, as demonstrated by X-ray crystallography. In the cage, four metals coordinate at the lower rim with the phenolic and ether oxygen atoms to shape the macrocycle with appropriate dihedral angles for tetrahedron formation, whereas four additional uranyl cations further coordinate at the upper-rim carboxylates to finalize the assembly. Counterions dictate the filling and porosity of the aggregates, whereas potassium induces highly porous structures, and tetrabutylammonium yields compact, densely packed frameworks. The tetrahedron metallo-cage complements our previous report (Pasquale et al., Nat. Commun., 2012, 3, 785) on uranyl-organic frameworks (UOFs) from calix[4]arene and calix[5]arene carboxylates (octahedral/cubic and icosahedral/dodecahedral giant cages, respectively) and completes the assembly of all five Platonic solids from just two chemical components.

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