Reversible control of nanoparticle functionalization and physicochemical properties by dynamic covalent exchange
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Existing methods for the covalent functionalization of nanoparticles rely on kinetically controlled reactions, and largely lack the sophistication of the preeminent oligonucleotide-based noncovalent strategies. Here we report the application of dynamic covalent chemistry for the reversible modification of nanoparticle (NP) surface functionality, combining the benefits of non-biomolecular covalent chemistry with the favorable features of equilibrium processes. A homogeneous monolayer of nanoparticle-bound hydrazones can undergo quantitative dynamic covalent exchange. The pseudomolecular nature of the NP system allows for the in situ characterization of surface-bound species, and real-time tracking of the exchange reactions. Furthermore, dynamic covalent exchange offers a simple approach for reversibly switching—and subtly tuning—NP properties such as solvophilicity.
della Sala , F & Kay , E R 2015 , ' Reversible control of nanoparticle functionalization and physicochemical properties by dynamic covalent exchange ' Angewandte Chemie International Edition , vol. 54 , no. 14 , pp. 4187–4191 . DOI: 10.1002/anie.201409602
Angewandte Chemie International Edition
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DescriptionThis work was supported by the EPSRC (EP/K016342/1 and DTG), the University of St Andrews, and by a Royal Society of Edinburgh/Scottish Government Fellowship (E.R.K.).
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