Inter-Backbone Charge Transfer as Prerequisite for Long-Range Conductivity in Perylene Bisimide Hydrogels

Max Burian, Francesco Rigodanza, Nicola Demitri, Luka D Ord Ević, Silvia Marchesan, Tereza Steinhartova, Ilse Letofsky-Papst, Ivan Khalakhan, Eléonore Mourad, Stefan A Freunberger, Heinz Amenitsch, Maurizio Prato, Zois Syrgiannis

Research output: Contribution to journalArticlepeer-review


Hydrogelation, the self-assembly of molecules into soft, water-loaded networks, is one way to bridge the structural gap between single molecules and functional materials. The potential of hydrogels, such as those based on perylene bisimides, lies in their chemical, physical, optical, and electronic properties, which are governed by the supramolecular structure of the gel. However, the structural motifs and their precise role for long-range conductivity are yet to be explored. Here, we present a comprehensive structural picture of a perylene bisimide hydrogel, suggesting that its long-range conductivity is limited by charge transfer between electronic backbones. We reveal nanocrystalline ribbon-like structures as the electronic and structural backbone units between which charge transfer is mediated by polar solvent bridges. We exemplify this effect with sensing, where exposure to polar vapor enhances conductivity by 5 orders of magnitude, emphasizing the crucial role of the interplay between structural motif and surrounding medium for the rational design of devices based on nanocrystalline hydrogels.

Original languageEnglish
Pages (from-to)5800–5806
Number of pages7
JournalACS Nano
Issue number6
Publication statusE-pub ahead of print - 11 Jun 2018


  • Journal Article


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