Effect of Perfluoroalkyl Chain Length on Proton Conduction in Fluoroalkylated Phosphonic, Phosphinic, and Sulfonic Acids

Effect of Perfluoroalkyl Chain Length on Proton Conduction in Fluoroalkylated Phosphonic, Phosphinic, and Sulfonic Acids

The effects of increasing perfluoroalkyl chain length on the molecular properties of viscosity, diffusivity, and ionic conductivity of a series of acid model compounds analogous to comb-branch perfluorinated ionomers functionalized with phosphonic, phosphinic, and sulfonic protogenic groups are repo...

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Veröffentlicht in:The journal of physical chemistry. B 2010-11, Vol.114 (46), p.14972-14976
Hauptverfasser: Herath, Mahesha B., Creager, Stephen E., Kitaygorodskiy, Alex, DesMarteau, Darryl D.
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B: Surfactants, Membranes
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container_end_page 14976
container_issue 46
container_start_page 14972
container_title The journal of physical chemistry. B
container_volume 114
creator Herath, Mahesha B.
Creager, Stephen E.
Kitaygorodskiy, Alex
DesMarteau, Darryl D.
description The effects of increasing perfluoroalkyl chain length on the molecular properties of viscosity, diffusivity, and ionic conductivity of a series of acid model compounds analogous to comb-branch perfluorinated ionomers functionalized with phosphonic, phosphinic, and sulfonic protogenic groups are reported. Anhydrous proton transport by a Grotthuss-like hopping mechanism was observed to occur efficiently in phosphorus-based fluoroalkylated model acids but only when there is a relatively low perfluoroalkyl content. The decrease in degree of dissociation of the protogenic groups follows the order phosphonic > phosphinic > sulfonic, and the degree of dissociation and the magnitude of ion−ion correlations are approximately independent of chain length.
doi_str_mv 10.1021/jp107190q
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title Effect of Perfluoroalkyl Chain Length on Proton Conduction in Fluoroalkylated Phosphonic, Phosphinic, and Sulfonic Acids
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