title: Zn2+-Ion Sensing by Fluorescent Schiff Base Calix[4]arene Macrocycles.
abstract: A macrocyclic ligand (H2L) containing two o,o'-bis(iminomethyl)phenol and two calix[4]arene head units has been synthesized and its coordination chemistry towards divalent Ni and Zn investigated. The new macrocycle forms complexes of composition [ML] (M=Zn, M=Ni) and [ZnL(py)2], which were characterized by elemental analysis; IR, UV/Vis, and NMR spectroscopy; electrospray ionization mass spectrometry (ESI-MS); and X-ray crystallography (for [ZnL(py)2] and [NiL]). H2L allows the sensitive optical detection of Zn2+among a series of biologically relevant metal ions by a dual fluorescence enhancement/quenching effect in solution. The fluorescence intensity of the macrocycle increases by a factor of ten in the presence of Zn2+with a detection limit in the lower nanomolar region.
authors.affiliation: Institut für Anorganische Chemie, Universität Leipzig, Johannisallee 29, 04103, Leipzig, Germany.
authors.forename: Steve
authors.initials: S
authors.lastname: Ullmann
authors.affiliation: Institut für Anorganische Chemie, Universität Leipzig, Johannisallee 29, 04103, Leipzig, Germany.
authors.forename: René
authors.initials: R
authors.lastname: Schnorr
authors.affiliation: Institut für Anorganische Chemie, Universität Leipzig, Johannisallee 29, 04103, Leipzig, Germany.
authors.forename: Marcel
authors.initials: M
authors.lastname: Handke
authors.affiliation: Leibniz-Institut für Oberflächenmodifizierung e. V., Chemische Abteilung, 04318, Leipzig, Germany.
authors.forename: Christian
authors.initials: C
authors.lastname: Laube
authors.affiliation: Leibniz-Institut für Oberflächenmodifizierung e. V., Chemische Abteilung, 04318, Leipzig, Germany.
authors.forename: Bernd
authors.initials: B
authors.lastname: Abel
authors.affiliation: Institut für Analytische Chemie, Universität Leipzig, Johannisallee 29, 04103, Leipzig, Germany.
authors.forename: Jörg
authors.initials: J
authors.lastname: Matysik
authors.affiliation: Institut für Analytische Chemie, Universität Leipzig, Johannisallee 29, 04103, Leipzig, Germany.
authors.forename: Matthias
authors.initials: M
authors.lastname: Findeisen
authors.affiliation: Wilhelm-Ostwald-Institut für Physikalische und Theoretische Chemie, Universität Leipzig, Linnéstraße 2, 04103, Leipzig, Germany.|Scientific Computing & Modelling NV, De Boelelaan 1083, 1081 HV, Amsterdam, The Netherlands.
authors.forename: Robert
authors.initials: R
authors.lastname: Rüger
authors.affiliation: Wilhelm-Ostwald-Institut für Physikalische und Theoretische Chemie, Universität Leipzig, Linnéstraße 2, 04103, Leipzig, Germany.
authors.forename: Thomas
authors.initials: T
authors.lastname: Heine
authors.affiliation: Institut für Anorganische Chemie, Universität Leipzig, Johannisallee 29, 04103, Leipzig, Germany.
authors.forename: Berthold
authors.identifier: http://orcid.org/0000-0001-5386-2809
authors.initials: B
authors.lastname: Kersting
keywords: calix[4]arenes; fluorescence sensor; macrocyclic complexes; nickel; zinc