title: A ditopic ferrocene receptor for anions and cations that functions as a chromogenic molecular switch.
abstract: A ferrocene-based ditopic receptor containing a urea and a benzocrown ether unit shows a remarkable colour switching (ON-and-OFF) function induced by anion and cation recognition.
authors.affiliation: School of Chemistry, University of Exeter, Exeter, UK EX4 4QD.
authors.forename: Hidekazu
authors.initials: H
authors.lastname: Miyaji
authors.forename: Simon R
authors.initials: SR
authors.lastname: Collinson
authors.forename: Ivan
authors.initials: I
authors.lastname: Prokeŝ
authors.forename: James H R
authors.initials: JH
authors.lastname: Tucker