title: A Biphenol-Based Chemosensor for Zn(II) and Cd(II) Metal Ions: Synthesis, Potentiometric Studies, and Crystal Structures.
abstract: We synthesized and characterized the ligand N,N'-bis[(2,2'-dihydroxybiphen-3-yl)methyl]-N,N'-dimethylethylenediamine (L), which contains two biphenol moieties linked as side arms to an N,N'-dimethylethylenediamine scaffold. The ligand is highly soluble in a 50/50 (v/v) water/ethanol mixture and, in its deprotonated form H-2L(2-), is able to coordinate transition-metal ions such as Ni(II), Zn(II), Cu(II), Cd(II), and Pd(II). The crystal structures of [Ni(H-2L)·2n-BuOH], [Ni(H-2L)·2MeOH], [Cd(H-2L)·2DMF], [Cu(H-2L)(DMF)], and [Pd(H-2L)(DMF)] were also determined and described. Potentiometric titrations were carried out in a mixed solvent with Zn(II), Cu(II), and Ni(II) metal ions to determine the acid-base and stability constants. L was highly fluorescent in the visible range (400 nm). Moreover, its emission intensity increased upon the addition of Zn(II) or Cd(II) ions in an ethanol/water solution and behaved as a chemosensor for the presence of these ions in the solution.
authors.affiliation: Department of Pure and Applied Sciences, University of Urbino , Piazza Rinascimento 6, I-61029 Urbino, Italy.
authors.forename: Gianluca
authors.initials: G
authors.lastname: Ambrosi
authors.affiliation: Department of Pure and Applied Sciences, University of Urbino , Piazza Rinascimento 6, I-61029 Urbino, Italy.
authors.forename: Mauro
authors.initials: M
authors.lastname: Formica
authors.affiliation: Department of Pure and Applied Sciences, University of Urbino , Piazza Rinascimento 6, I-61029 Urbino, Italy.
authors.forename: Vieri
authors.initials: V
authors.lastname: Fusi
authors.affiliation: Department of Pure and Applied Sciences, University of Urbino , Piazza Rinascimento 6, I-61029 Urbino, Italy.
authors.forename: Luca
authors.initials: L
authors.lastname: Giorgi
authors.affiliation: Department of Chemistry and Biology, University of Salerno , via Giovanni Paolo II 132, I-84084 Fisciano, Italy.
authors.forename: Eleonora
authors.initials: E
authors.lastname: Macedi
authors.affiliation: Department of Pure and Applied Sciences, University of Urbino , Piazza Rinascimento 6, I-61029 Urbino, Italy.
authors.forename: Mauro
authors.initials: M
authors.lastname: Micheloni
authors.affiliation: Department of Industrial Engineering, University of Florence , via S. Marta 3, I-50139 Florence, Italy.
authors.forename: Paola
authors.initials: P
authors.lastname: Paoli
authors.affiliation: Department of Industrial Engineering, University of Florence , via S. Marta 3, I-50139 Florence, Italy.
authors.forename: Patrizia
authors.initials: P
authors.lastname: Rossi