Reversible trapping and reaction acceleration within dynamically self-assembling nanoflasks

Hui Zhao, Soumyo Sen, T. Udayabhaskararao, Michal Sawczyk, Kristina Kucanda, Debasish Manna, Pintu K. Kundu, Ji Woong Lee, Petr Král, Rafal Klajn

Research output: Contribution to journalArticlepeer-review

182 Citations (Scopus)


The chemical behaviour of molecules can be significantly modified by confinement to volumes comparable to the dimensions of the molecules. Although such confined spaces can be found in various nanostructured materials, such as zeolites, nanoporous organic frameworks and colloidal nanocrystal assemblies, the slow diffusion of molecules in and out of these materials has greatly hampered studying the effect of confinement on their physicochemical properties. Here, we show that this diffusion limitation can be overcome by reversibly creating and destroying confined environments by means of ultraviolet and visible light irradiation. We use colloidal nanocrystals functionalized with light-responsive ligands that readily self-assemble and trap various molecules from the surrounding bulk solution. Once trapped, these molecules can undergo chemical reactions with increased rates and with stereoselectivities significantly different from those in bulk solution. Illumination with visible light disassembles these nanoflasks, releasing the product in solution and thereby establishes a catalytic cycle. These dynamic nanoflasks can be useful for studying chemical reactivities in confined environments and for synthesizing molecules that are otherwise hard to achieve in bulk solution.

Original languageEnglish
Pages (from-to)82-88
Number of pages7
JournalNature nanotechnology
Issue number1
Publication statusPublished - Jan 1 2016

ASJC Scopus subject areas

  • Bioengineering
  • Atomic and Molecular Physics, and Optics
  • Biomedical Engineering
  • Materials Science(all)
  • Condensed Matter Physics
  • Electrical and Electronic Engineering

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