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• W2047623554 startingPage "7895" @default.
• W2047623554 abstract "En route toward the development of hybrid organic−inorganic extracting materials incorporating lead-selective chelators and their implementation in water purification processes, the lead(II) binding properties of three N-carbamoylmethyl-substituted 1,4,8,11-tetraazacyclotetradecanes (cyclams) have been fully investigated by spectroscopic (IR, UV−vis, MALDI-TOF MS, 1H and 13C NMR), X-ray crystallographic, potentiometric, and kinetic methods. Solution NMR studies revealed that the Pb2+ ion is entrapped in a molecular cage constituted by the four macrocyclic nitrogen and four amidic oxygen atoms. Protonation and lead binding constants determined in aqueous solution were shown to be linearly dependent, so that all three derivatives possess a similar affinity at any pH value. Thermodynamic and kinetic parameters revealed the crucial role played by the intramolecular hydrogen bonds also evidenced in the crystal structure of the tetraacetamide derivative L1, which involve the lone pair of each macrocyclic tertiary amine and one amidic hydrogen atom belonging to the appended arm. In contrast to L1, the absence of such intramolecular interactions for N-(dimethyl)carbamoylmethyl- and N-(diethyl)carbamoylmethyl-substituted cyclams (L2 and L3, respectively) accounts for the 2−3 orders of magnitude enhancement of their proton and lead binding affinities. Stopped-flow kinetic measurements enabled unraveling the formation process of the three lead(II) complexes that proceeds in a single rate-limiting step according to the Eigen−Winkler mechanism, while the apparent rate constants were found to increase in the order L3 < L2 ≪ L1 as a consequence of the more acidic character of L1. A common proton-assisted dissociation mechanism has been found for the three lead(II) complexes, which involves the rapid formation of a protonated, six-coordinate intermediate followed by either a unimolecular decomposition or a bimolecular attack of a second hydronium ion." @default.
• W2047623554 created "2016-06-24" @default.
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• W2047623554 date "2005-10-01" @default.
• W2047623554 modified "2023-10-03" @default.
• W2047623554 title "Synthesis, Characterization, and X-ray Crystal Structures of Cyclam Derivatives. 8. Thermodynamic and Kinetic Appraisal of Lead(II) Chelation by Octadentate Carbamoyl-Armed Macrocycles¹" @default.
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• W2047623554 doi "https://doi.org/10.1021/ic0508019" @default.
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