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Modulating the Sensor Response to Halide Using NBD-Based Azamacrocycles

2014; American Chemical Society; Volume: 53; Issue: 9 Linguagem: Inglês

10.1021/ic5001649

1520-510X

Stefano Amatori, Gianluca Ambrosi, E. Borgogelli, Mirco Fanelli, Mauro Formica, Vieri Fusi, Luca Giorgi, Eleonora Macedi, Mauro Micheloni, Paola Paoli, Patrizia Rossi, Aurora Tassoni,

Metal complexes synthesis and properties

Ligand L (2,6-bis{[7-(7-nitrobenzo[1,2,5]oxadiazole-4-yl)-3,10-dimethyl-1,4,7,10-tetraazacyclododeca-1-yl]methyl}phenol) is a fluorescent sensor that is useful for detecting Cu(II), Zn(II), and Cd(II). Some of the complexes formed are able to sense the presence of halides in solution. L passes through the cellular membrane, becoming fluorescent inside cells. The H(-1)L- species is able to form dinuclear complexes with [M(2)H(-1)L]3+ stoichiometry with Cu(II), Zn(II), and Cd(II) ions, experiencing a CHEF effect upon metal coordination in an acetonitrile/water 95:5 (v/v) solution. In all three of the complexes investigated, the metal cations are coordinatively unsaturated and can therefore bind secondary ligands as anionic species. The crystal structure of [Cd(2)(H(-1)L)Cl(2)](ClO(4))·4H(2)O is discussed. The Zn(II) complex behaves as an OFF-ON sensor for fluoride and chloride anions.