Supramolecular gel based on a perylene diimide dye: Multiple stimuli responsiveness, robustness, and photofunction

Elisha Krieg, Elijah Shirman, Haim Weissman, Eyal Shimoni, Sharon G. Wolf, Iddo Pinkas, Boris Rybtchinski

Research output: Contribution to journalArticle

167 Citations (Scopus)

Abstract

Design of an extensive supramolecular three-dimensional network that is both robust and adaptive represents a significant challenge. The molecular system PP2b based on a perylene diimide chromophore (PDI) decorated with polyethylene glycol groups self-assembles in aqueous media into extended supramolecular fibers that form a robust three-dimensional network resulting in gelation. The self-assembled systems were characterized by cryo-TEM, cryo-SEM, and rheological measurements. The gel possesses exceptional robustness and multiple stimuli-responsiveness. Reversible charging of PP2b allows for switching between the gel state and fluid solution that is accompanied by switching on and off the material's birefringence. Temperature triggered deswelling of the gel leads to the (reversible) expulsion of a large fraction of the aqueous solvent. The dual sensibility toward chemical reduction and temperature with a distinct and interrelated response to each of these stimuli is pertinent to applications in the area of adaptive functional materials. The gel also shows strong absorption of visible light and good exciton mobility (elucidated using femtosecond transient absorption), representing an advantageous light harvesting system.

Original languageEnglish
Pages (from-to)14365-14373
Number of pages9
JournalJournal of the American Chemical Society
Volume131
Issue number40
DOIs
Publication statusPublished - Oct 14 2009

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ASJC Scopus subject areas

  • Catalysis
  • Chemistry(all)
  • Biochemistry
  • Colloid and Surface Chemistry

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