DOI: https://doi.org/10.29363/nanoge.incnc.2021.053
Publication date: 8th June 2021
Since their introduction in 1991 by Arduengo, N-heterocyclic carbenes (NHCs) have attracted much attention as versatile metal-coordinating groups. This mode of interaction has also been actively investigated for surface passivating nanocrystal surfaces.
In this contribution, we probe the interactions between colloidal gold nanoparticles (AuNPs), or luminescent quantum dots (QDs) and three structurally distinct NHC-based ligands: two monodentate and one multidentate ligands [1,2]. The latter combines multiple NHC groups and several poly (ethylene glycol) (PEG) solubilizing moieties. We find that NHC-based ligands rapidly coordinate onto both sets of nanocrystals (requiring ~ 10 min of reaction time), which reflects the soft Lewis base nature of these groups, with their two electrons sharing capacity. We combine NMR spectroscopy, fluorescence spectroscopy, high-resolution transmission electron microscopy and dynamic light scattering to characterize the nature of the binding interactions. Furthermore, the long term stability of the NHC-stabilized nanocolloids have been tested after phase transfer to water, a highly challenging chemical venue for such groups. Data show that our NHC-polymers exhibit long-term colloidal stability in buffer media with no sign of degradation or aggregation build up for at least one year. Additionally, the benefits of the NHC-polymer ligand design have also been demonstrated for the coating of other transition metal core colloids (e.g., magnetic iron oxide and silver NPs). We will discuss the ligand design, characterization and potential use of these colloids in few specific applications.
We thank FSU and the National Science Foundation (NSFCHE #2005079) and Kasei-Asahi for financial support.
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