Electrochemical Sensing of Mercury over Cadmium and Lead Cations by the Redox-Active Polyazacycloalkane Ligand 1,1″: 1′,1′′′-Bis[ethane-1,2-diylbis(iminomethylene)]bis[ferrocene] |
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Authors: | Jos M Lloris Angel Benito Ramn Martínez-Mez Miguel E Padilla-Tosta Teresa Pardo Juan Soto MaríaJos L Tendero |
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Abstract: | The coordination behaviour of the redox-active polyazacycloalkane L1 against the toxic heavy-metal ions Cd2+, Pb2+, and Hg2+ was studied in THF/H2O 70 : 30 (containing 0.1 mol?dm?3 of (Bu4N)ClO4). The crystal and molecular structure of the cadmium complex Cd(L1)(NO3)2] ( 1 ) was determined by X-ray single-crystal analysis. The cadmium ion is in a 4+2 surrounding with the ligand L1 acting as tetradentate and the apical positions occupied by the O-atoms of the nitrate anions. An electrochemical study reveals that L1 shows a selective electrochemical response against Hg2+ over Cd2+ and Pb2+. |
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