Anion complexation and electrochemical behaviour of ferrocene-appended amido-pyrrole cleftsElectronic supplementary information (ESI) available: 1H and 13C NMR spectra of 1 and 2, 1H NMR titrations of 1 and 2 with various putative anionic guests and with chloride following ferrocene CH resonances. See http://www.rsc.org/suppdata/nj/b2/b202989h/

Two amido-pyrrole cleft anion receptors bearing two ferrocene reporter groups have been synthesised and crystallographically characterised; the receptors contain either a non-conjugated or conjugated link between the anion-binding amido-pyrrole unit and the ferrocene reporter groups. The anion binding affinities and electrochemical behaviour of the receptors in the absence and presence of anions have been studied by 1H NMR titration techniques and cyclic voltammetry using a Pt microdisc working electrode, respectively.