title: Multi-use NBD-based tetra-amino macrocycle: fluorescent probe for metals and anions and live cell marker.
abstract: Ligand L (4-(7-nitrobenzo[1,2,5]oxadiazole-4-yl)-1,7-dimethyl-1,4,7,10-tetra-azacyclododecane) is a versatile fluorescent sensor useful for Cu(II), Zn(II) and Cd(II) metal detection, as a building block of fluorescent metallo-receptor for halide detection, and as an organelle marker inside live cells. Ligand L undergoes a chelation-enhanced fluorescence (CHEF) effect upon metal coordination in acetonitrile solution. In all three complexes investigated the metal cation is coordinatively unsaturated; thus, it can bind secondary ligands as anionic species. The crystal structure of [ZnLCl](ClO(4)) is discussed. Cu(II) and Zn(II) complexes are quenched upon halide interaction, whereas the [CdL](2+) species behaves as an OFF-ON sensor for halide anions in acetonitrile solution. The mechanism of the fluorescence response in the presence of the anion depends on the nature of the metal ion employed and has been studied by spectroscopic methods, such as NMR spectroscopy, UV/Vis and fluorescence techniques and by computational methods. Subcellular localization experiments performed on HeLa cells show that L mainly localizes in spot-like structures in a polarized portion of the cytosol that is occupied by the Golgi apparatus to give a green fluorescence signal.
authors.affiliation: Department of Biomolecular Sciences, Molecular Pathology Laboratory PaoLa, University of Urbino Carlo Bo, Via Arco d'Augusto 2, I-61032 Fano (PU), Italy.
authors.forename: Stefano
authors.initials: S
authors.lastname: Amatori
authors.forename: Gianluca
authors.initials: G
authors.lastname: Ambrosi
authors.forename: Mirco
authors.initials: M
authors.lastname: Fanelli
authors.forename: Mauro
authors.initials: M
authors.lastname: Formica
authors.forename: Vieri
authors.initials: V
authors.lastname: Fusi
authors.forename: Luca
authors.initials: L
authors.lastname: Giorgi
authors.forename: Eleonora
authors.initials: E
authors.lastname: Macedi
authors.forename: Mauro
authors.initials: M
authors.lastname: Micheloni
authors.forename: Paola
authors.initials: P
authors.lastname: Paoli
authors.forename: Roberto
authors.initials: R
authors.lastname: Pontellini
authors.forename: Patrizia
authors.initials: P
authors.lastname: Rossi
authors.forename: Maria Antonietta
authors.initials: MA
authors.lastname: Varrese
mesh_terms: D000838:Anions / Q000737:chemistry*; D001372:Aza Compounds / Q000737:chemistry*; D002104:Cadmium / Q000737:chemistry*; D002614:Chelating Agents / Q000737:chemistry*; D018360:Crystallography, X-Ray; D005456:Fluorescent Dyes / Q000737:chemistry*; D006367:HeLa Cells / Q000737:chemistry*; D006801:Humans; D007477:Ions / Q000737:chemistry*; D008024:Ligands; D047028:Macrocyclic Compounds / Q000737:chemistry*; D009682:Magnetic Resonance Spectroscopy; D008670:Metals / Q000737:chemistry*; D008958:Models, Molecular; D015394:Molecular Structure; D010069:Oxadiazoles / Q000737:chemistry*; D015032:Zinc / Q000737:chemistry*
chemical_list: C572467:4-(7-nitrobenzo(1,2,5)oxadiazole-4-yl)-1,7-dimethyl-1,4,7,10-tetra-azacyclododecane; D000838:Anions; D001372:Aza Compounds; D002614:Chelating Agents; D005456:Fluorescent Dyes; D007477:Ions; D008024:Ligands; D047028:Macrocyclic Compounds; D008670:Metals; D010069:Oxadiazoles; D002104:Cadmium; D015032:Zinc