Redox-responsive Host-Guest Association Between g-Cyclodextrin and Mixed-Metal Keggin-Type Polyoxometalates - Archive ouverte HAL Accéder directement au contenu
Article Dans Une Revue Inorganic Chemistry Année : 2021

Redox-responsive Host-Guest Association Between g-Cyclodextrin and Mixed-Metal Keggin-Type Polyoxometalates

Résumé

The complexation of Keggin-type polyoxometalates (POMs) with g-cyclodextrin (g-CD) leads to supramolecular inclusion assemblies in aqueous solution driven by chaotropic effect. The strength of the interaction between g-CD and oxidized or one-electron reduced POMs in a series of molybdenum and vanadium monosubstituted phospho-and silico-tungstates, [XW11MO40] n-Keggin-type anions where X = P or Si and M = Mo V/VI or V IV/V , has been evaluated by isothermal titration calorimetry (ITC), NMR spectroscopy and cyclic voltammetry. Such a study reveals the host-guest binding constant K1:1 increases strongly with the decrease of the global ionic charge of the POM unit. There is almost one magnitude order of variation in K1:1 per charge unit, where K1:1 falls down from about 10 5 to values close to zero as ionic charge varies from 3-to 6-. Such POMs with molybdenum and vanadium addenda offer the possibility of tuning the hostguest association strength by simple addition/removal of one electron to POMs, opening new avenue for the design of smart materials through redox stimuli.

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Chimie
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Dates et versions

hal-03265357 , version 1 (20-06-2021)

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Sa Yao, Clément Falaise, Soumaya Khlifi, Nathalie Leclerc, Mohamed Haouas, et al.. Redox-responsive Host-Guest Association Between g-Cyclodextrin and Mixed-Metal Keggin-Type Polyoxometalates. Inorganic Chemistry, 2021, 60 (10), pp.7433-7441. ⟨10.1021/acs.inorgchem.1c00724⟩. ⟨hal-03265357⟩
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