1439374-40-9Relevant academic research and scientific papers
Template control over dimerization and guest selectivity of interpenetrated coordination cages
Freye, Sabrina,Michel, Reent,Stalke, Dietmar,Pawliczek, Martin,Frauendorf, Holm,Clever, Guido H.
supporting information, p. 8476 - 8479 (2013/07/19)
We have previously shown that the self-assembly of dibenzosuberone-based bis-monodentate pyridyl ligands L1 with PdII cations leads to the quantitative formation of interpenetrated coordination cages [BF 4@Pd4L18]. The BF4 - anion inside the central cavity serves as a template, causing the outer two pockets to show a tremendous affinity for allosteric binding of two small chloride anions. Here we show that derivatization of the ligand backbone with a bulky aryl substituent allows us to control the dimerization and hence the guest-binding ability of the cage by the choice of the templating anion. Steric constraints imposed by L2 prevent the large BF 4- anion from serving as a template for the formation of interpenetrated double cages. Instead, a single isomer of the monomeric cage [Pd2L24] is formed. Addition of the small anionic template Cl- permits dimerization, yielding the interpenetrated double cage [Cl@Pd4L28], whose enlarged outer pockets show a preference for the binding of large anions such as ReO4-.
