A Biphenol-Based Chemosensor for ZnII and CdII Metal Ions: Synthesis, Potentiometric Studies, and Crystal Structures

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• 作者：Gianluca Ambrosi ; Mauro Formica ; Vieri Fusi ; Luca Giorgi ; Eleonora Macedi ; Mauro Micheloni ; Paola Paoli ; Patrizia Rossi
• 刊名：Inorganic Chemistry
• 出版年：2016
• 出版时间：August 1, 2016
• 年：2016
• 卷：55
• 期：15
• 页码：7676-7687
• 全文大小：656K
• 年卷期：0
• ISSN：1520-510X

文摘

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.