Quinoxaline-oligopyrroles: Improved pyrrole-based anion receptorsElectronic supplementary information (ESI) available: synthetic details of 3 and 4, titration studies for anion binding of 3 and 4, and crystallographic details for 3. See http://www.rsc.org/suppdata/cc/b1/b111708d/

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Abstract
Novel quinoxaline derivatives bearing dipyrromethane or tripyrromethane substituents act as improved anion receptors as compared to the unsubstituted dipyrrolylquinoxaline core from which they are derived.