title: Rhodamine Based Turn-On Sensors for Ni(2+) and Cr(3+) in Organic Media: Detecting CN(-) via the Metal Displacement Approach.
abstract: Two novel sensors bearing rhodamine B and quinoline units have been synthesized. One of these, 1, allows sensitive and selective detection of Ni(2+) and Cr(3+) by forming non-fluorescent (1-Ni(2+)) and fluorescent (1-Cr(3+)) complexes respectively. Both metals trigger the formation of highly colored ring-open spirolactam. These form excellent probes for CN(-) which quenches the fluorescence of the 1-Cr(3+) complex by extracting the Cr(3+). Both Cr(3+) and Cu(2+) gave color changes with 2, but they are easily identified separately via the large fluorescence enhancement that occurs only with Cr(3+).
authors.affiliation: Department of Chemistry, Western Michigan University, Kalamazoo, MI, 49008, USA.
authors.forename: Aruna J
authors.initials: AJ
authors.lastname: Weerasinghe
authors.affiliation: Department of Chemistry, Western Michigan University, Kalamazoo, MI, 49008, USA.
authors.forename: Agozie N
authors.initials: AN
authors.lastname: Oyeamalu
authors.affiliation: Department of Chemistry, Western Michigan University, Kalamazoo, MI, 49008, USA.
authors.forename: Fasil A
authors.initials: FA
authors.lastname: Abebe
authors.affiliation: Department of Chemistry, Western Michigan University, Kalamazoo, MI, 49008, USA.
authors.forename: Andre R
authors.initials: AR
authors.lastname: Venter
authors.affiliation: Department of Chemistry, Western Michigan University, Kalamazoo, MI, 49008, USA. ekk.sinn@wmich.edu.
authors.forename: Ekkehard
authors.identifier: http://orcid.org/0000-0002-9817-8135
authors.initials: E
authors.lastname: Sinn
keywords: Chromium(III) detection; Cyanide detection; Fluorescence; Nickel(II) detection; Rhodamine derivatives; Turn-on Sensor