Fluorometric Chemosensors. Interaction of Toxic Heavy Metal Ions PbII, CdII, and HgII with Novel Mixed-Donor Phenanthroline-Containing Macrocycles: Spectrofluorometric
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- 作者：M. Carla Aragoni ; Massimiliano Arca ; Francesco Demartin ; Francesco A. Devillanova ; Francesco Isaia ; Alessandra Garau ; Vito Lippolis ; Fahimeh Jalali ; Ulrich Papke ; Mojtaba Shamsipur ; Lorenzo Tei ; Abdol
- 刊名：Inorganic Chemistry
- 出版年：2002
- 出版时间：December 16, 2002
- 年：2002
- 卷：41
- 期：25
- 页码：6623 - 6632
- 全文大小：230K
- 年卷期：v.41,no.25(December 16, 2002)
- ISSN：1520-510X
文摘
The macrocycles L1-L3 incorporating N2S3-, N2S2O-, and N2S2-donor sets, respectively, and containing the 1,10-phenanthroline unit interact in acetonitrile solution with heavy metal ions such as PbII, CdII, and HgII to give 1:1 ML,1:2 ML2, and 2:1 M2L complex species, which specifically modulate the photochemical properties of the ligands.The stoichiometry of the complex species formed during spectrofluorometric titrations and their formation constantsin MeCN at 25 
C were determined from fluorescence vs MII/L molar ratio data. The complexes [Pb(L1)][ClO4]2·1/2H2O (1), [Pb(L2)][ClO4]2·MeNO2 (1a), [Pb(L3)2][ClO4]2·2MeCN (1b), and [Cd(L3)][NO3]2 (2b) were also characterizedby X-ray diffraction studies. The conformation adopted by L1-L3 in these species reveals the aliphatic portion ofthe rings folded over the plane containing the heteroaromatic moiety with the ligands trying to encapsulate themetal center within their cavity. In 1, 1a, and 2b the metal ion completes the coordination sphere by interactingwith counteranion units and solvent molecules. On the contrary, the 1:2 complex 1b shows PbII sandwiched betweentwo symmetry-related molecules of L3 reaching an overall [4N + 4S] eight-coordination.
C were determined from fluorescence vs MII/L molar ratio data. The complexes [Pb(L1)][ClO4]2·1/2H2O (1), [Pb(L2)][ClO4]2·MeNO2 (1a), [Pb(L3)2][ClO4]2·2MeCN (1b), and [Cd(L3)][NO3]2 (2b) were also characterizedby X-ray diffraction studies. The conformation adopted by L1-L3 in these species reveals the aliphatic portion ofthe rings folded over the plane containing the heteroaromatic moiety with the ligands trying to encapsulate themetal center within their cavity. In 1, 1a, and 2b the metal ion completes the coordination sphere by interactingwith counteranion units and solvent molecules. On the contrary, the 1:2 complex 1b shows PbII sandwiched betweentwo symmetry-related molecules of L3 reaching an overall [4N + 4S] eight-coordination.