Magnetic and fluorescent assemblies of iron-oxide nanoparticles (NPs) were constructed by threading a violo-gen-based ditopic ligand, DPV2+ , into the cavity of cucurbituril (CB) macrocycles adsorbed on the surface of the NPs. Evidence for the formation of 1:2 inclusion complexes that involve DPV2+ and two CB macrocycles was first obtained in solution by 1H NMR and emission spectroscopy. DPV2+ was found to induce self-assembly of nanoparticle arrays (DPV2 + ⊂CBNPs) by bridging CB molecules on different NPs. The resulting viologen-crosslinked iron-oxide nanoparticles exhibited increased saturation magnetization and emission properties. This facile supramolecular approach to NP self-assembly provides a platform for the synthesis of smart and innovative materials that can achieve a high degree of functionality and complexity and that are needed for a wide range of applications.
- Solid-state fluorescence
- Superparamagnetic nanoparticles
- Surface modification
ASJC Scopus subject areas