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DOI: 10.1039/A802394H (Paper) Reference Section for: J. Chem. Soc., Dalton Trans., 1998, 2635-2642

Binding, electrochemical and metal extraction properties of the new redox-active polyazacycloalkane 1,4,7,10,13,16-hexa(ferrocenylmethyl)-1,4,7,10,13,16-hexaazacyclooctadecane

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José Manuel Lloris, Ramón Martínez-Máñez, Teresa Pardo, Juan Soto and Miguel E. Padilla-Tosta

Abstract

The redox-functionalised polyazacycloalkane receptor 1,4,7,10,13,16-hexa(ferrocenylmethyl)-1,4,7,10,13,16-hexaazacyclooctadecane (L1) has been designed and synthesized and its binding, electrochemical and metal extraction properties studied. The results have been compared to those obtained for the parent redox-active polyazacycloalkane 1,4,8,11-tetra(ferrocenylmethyl)-1,4,8,11-tetraazacyclotetradecane, L3. The cadmium complex of L1 and the free receptor L3 have been crystallographically characterised. The structure of [CdL1][PF6]2·4CH3CN·4H2O consists of cationic [CdL1]2+ units in which the cadmium ion exhibits a distorted octahedral environment. Solution studies by potentiometric methods have also been carried out in the presence of H+ and Cu2+ in 1,4-dioxane–water (70∶30 v/v, 25 °C, 0.1 mol dm–3 KNO3) for L1 and thf–water (70∶30 v/v, 25 °C, 0.1 mol dm–3 [NBun4][ClO4]) for L3. Electrochemical experiments as a function of the pH in the presence of Ni2+, Cu2+, Zn2+, Cd2+ or Pb2+ have been carried out for L1 and L3. The solvent extraction properties of L1 have also been studied.

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