Self-assembly and anion sensing of metal–organic [M6L2] cages from fluorescent triphenylamine tri-pyrazoles with dipalladium(ii,ii) corners

Abstract

Three hexametal-organic cages [(N^N)₆Pd₆L₂]⁶⁺ with syn, syn, syn conformation were synthesized via the coordination of tris(4-(1H-pyrazol-3-yl)phenyl)amine ligands and [(N^N)₂Pd₂(NO₃)₂](NO₃)₂ dimetallic corners (N^N = 2,2′-bipyridine for 1; 4,4′-dimethylbipyridine for 2; 1,10-phenanthroline for 3). These hexametal-organic cages exhibit anion sensing toward HSO₃⁻ in aqueous solution via fluorescent titration and NMR spectroscopy studies.