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Molecular sponge for the electronics of the future

June 17, 2024
Technische Universität Dresden
An international research team has succeeded in developing a new type of material in the rather young research field of covalent organic frameworks. The new two-dimensional polymer is characterized by the fact that its properties can be controlled in a targeted and reversible manner. This has brought the researchers a step closer to the goal of realizing switchable quantum states.

Porous covalent organic frameworks (COFs) are a class of highly ordered, porous materials consisting of organic molecules that are linked by covalent bonds to form a network. They enable the construction of functional materials with molecular precision. Similar to metal organic frameworks (MOFs), which were discovered around 25 years ago and have already reached market maturity, COFs possess highly promising structural, optical and electronic properties for numerous applications, for example in gas and liquid storage, catalysis, sensor technology and energy applications.

Previous research on COFs has generally focussed on the construction of rigid frameworks with static material properties. Dr Florian Auras and his team at the Chair of Molecular Functional Materials at TUD have now developed a design strategy for dynamic two-dimensional COFs that can open and close their pores in a controlled manner, similar to a sponge. "The main aim of the study was to equip these frameworks, which are normally very precisely ordered but rigid, with exactly the right degree of flexibility so that their structure can be switched from compact to porous. By adding solvent to the molecular sponge, we can now temporarily and reversibly change the local geometry as well as optical properties such as colour or fluorescence," says Florian Auras, explaining his research approach.

The ability to switch the structural and optoelectronic properties of the materials back and forth in a targeted manner makes the materials particularly interesting for future applications in electronics and information technology. "Our research results form the basis for our further research into stimuli-responsive polymers, particularly with the aim of realising switchable quantum states. When working on COFs, I am always fascinated by how precisely their properties can be manipulated by controlling the molecular structure," adds Auras.

Story Source:

Materials provided by Technische Universität Dresden. Note: Content may be edited for style and length.

Journal Reference:

  1. Florian Auras, Laura Ascherl, Volodymyr Bon, Simon M. Vornholt, Simon Krause, Markus Döblinger, Derya Bessinger, Stephan Reuter, Karena W. Chapman, Stefan Kaskel, Richard H. Friend, Thomas Bein. Dynamic two-dimensional covalent organic frameworks. Nature Chemistry, 2024; DOI: 10.1038/s41557-024-01527-8

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Technische Universität Dresden. "Molecular sponge for the electronics of the future." ScienceDaily. ScienceDaily, 17 June 2024. <>.
Technische Universität Dresden. (2024, June 17). Molecular sponge for the electronics of the future. ScienceDaily. Retrieved July 24, 2024 from
Technische Universität Dresden. "Molecular sponge for the electronics of the future." ScienceDaily. (accessed July 24, 2024).

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