Solvent-Controlled Self-Assembled Oligopyrrolic Receptor

Fei Wang, Mads Christian Larsen, Steffen Bähring*, Masatoshi Ishida*, Hiroyuki Furuta*, Atanu Jana*

*Corresponding author for this work

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We report a fully organic pyridine-tetrapyrrolic U-shaped acyclic receptor 10, which prefers a supramolecular pseudo-macrocyclic dimeric structure ( 10) 2 in a less polar, non-coordinating solvent (e.g., CHCl 3). Conversely, when it is crystalized from a polar, coordinating solvent (e.g., N, N-dimethylformamide, DMF), it exhibited an infinite supramolecular one-dimensional (1D) "zig-zag" polymeric chain, as inferred from the single-crystal X-ray structures. This supramolecular system acts as a potential receptor for strong acids, e.g., p-toluenesulfonic acid (PTSA), methane sulfonic acid (MSA), H 2SO 4, HNO 3, and HCl, with a prominent colorimetric response from pale yellow to deep red. The receptor can easily be recovered from the organic solution of the host-guest complex by simple aqueous washing. It was observed that relatively stronger acids with p K a < -1.92 in water were able to interact with the receptor, as inferred from 1H NMR titration in tetrahydrofuran- d 8 (THF- d 8) and ultraviolet-visible (UV-vis) spectroscopic titrations in anhydrous THF at 298 K. Therefore, this new dynamic supramolecular receptor system may have potentiality in materials science research.

Original languageEnglish
Article number1771
Issue number6
Number of pages13
Publication statusPublished - 2021

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